Isuzu Ascender LS 2004 Manual
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Isuzu Ascender LS 2004 Manual

Isuzu Ascender LS 2004 Manual

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Table of Contents

SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Fastener Tightening Specifications
Passenger Supplemental Inflatable Restraint (PSIR) Bolts
Supplemental Inflatable Restraint (SIR) Front End
Discriminating Sensor Bolts
SIR Instrument Panel Module Nuts
Supplemental Inflatable Restraint (SIR) IP Module Screws
SIR Sensing and Diagnostic Module (SDM) Nuts
SIR Side Impact Module Screws
SIR Side Impact Sensor Screws
SCHEMATIC AND ROUTING DIAGRAMS
SIR SCHEMATIC ICONS
SIR Schematic Icons
2004 Isuzu Ascender LS
2004 Isuzu Ascender LS
2004 RESTRAINTS SIR - Ascender
2004 RESTRAINTS SIR - Ascender
2004 RESTRAINTS
SIR - Ascender
Application
Icon
Specification
Metric
Fully Driven, seated
and not stripped
8 N.m
8 N.m
8 N.m
12 N.m
9 N.m
8 N.m
Icon Definition
CAUTION:
When performing service on or near the SIR
components or the SIR wiring, the SIR system
must be disabled. Refer to SIR Disabling and
Enabling Zones. Failure to observe the correct
procedure could cause deployment of the SIR
components, personal injury, or unnecessary
SIR system repairs.
English
71 in. lb.
71 in. lb.
71 in. lb.
106 in. lb.
80 in. lb.
71 in. lb.

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  • Page 1 2004 Isuzu Ascender LS 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 2004 RESTRAINTS SIR - Ascender 2004 RESTRAINTS SIR - Ascender SPECIFICATIONS FASTENER TIGHTENING SPECIFICATIONS Fastener Tightening Specifications Specification Application Metric English Fully Driven, seated Passenger Supplemental Inflatable Restraint (PSIR) Bolts...
  • Page 2 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender IMPORTANT: In order to prevent accidental deployment, the shorting bars close in order to short the connectors when the connectors are separated.
  • Page 3 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender SIR SCHEMATICS Fig. 1: Power, Ground, Serial Data, Indicator & Side Impact Sensors Schematic Courtesy of GENERAL MOTORS CORP.

  • Page 4: Component Locator

    2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 2: Frontal Sensors & Modules Schematic Courtesy of GENERAL MOTORS CORP. COMPONENT LOCATOR SIR COMPONENT VIEWS...
  • Page 5 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 3: Identifying Restraint Electronic Frontal Sensor Courtesy of GENERAL MOTORS CORP. Identifying Callouts For Fig. 3 Callout Component Name Frame, Front Inflatable Restraint Electronic Frontal Sensor...
  • Page 6 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 4: Identifying Inflatable Restraint I/P Module Courtesy of GENERAL MOTORS CORP. Identifying Callouts For Fig. 4 Callout Component Name Inflatable Restraint I/P Module Instrument Panel...
  • Page 7 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 5: Identifying Inflatable Restraint Steering Wheel Module Courtesy of GENERAL MOTORS CORP. Identifying Callouts For Fig. 5 Callout Component Name Inflatable Restraint Steering Wheel Module Steering Column...
  • Page 8 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 6: Identifying Inflatable Restraint Side Impact Module-Right Courtesy of GENERAL MOTORS CORP. Identifying Callouts For Fig. 6 Callout Component Name Inflatable Restraint Side Impact Module-Right Passenger Seat, Driver Seat Similar...
  • Page 9 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 7: Identifying Inflatable Restraint Side Impact Sensor (SIS) - Right Courtesy of GENERAL MOTORS CORP. Identifying Callouts For Fig. 7 Callout Component Name Inflatable Restraint Side Impact Sensor (SIS) - Right...
  • Page 10 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 8: Identifying Inflatable Restraint Sensing and Diagnostic Module (SDM) Courtesy of GENERAL MOTORS CORP. Identifying Callouts For Fig. 8 Callout Component Name Lower Console Inflatable Restraint Sensing and Diagnostic Module (SDM)
  • Page 11 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 9: Identifying SIR Zones - Isuzu Ascender Courtesy of GENERAL MOTORS CORP. Identifying Callouts For Fig. 9 Callout Component Name Inflatable Restraint Front End Sensor-right- Right-Located on the front of the...
  • Page 12 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Inflatable Restraint Front End Sensor-left-Located on the front of the vehicle in the engine compartment SIR CONNECTOR END VIEWS Identifying Electronic Frontal Sensor (EFS) - Left - Connector End View & Functions 15356723 ...
  • Page 13 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 15356723  Connector Part Information 2-Way F GT 150 Series, Sealed 4.0 (YE)  Wire Color Circuit No. Function D-GN 1409 Discriminating Sensor - Right - Signal 1834 Forward Discriminating Sensor Signal Identifying Inflatable Restraint I/P Module Connector End View &...
  • Page 14 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 3027 I/P Module - Stage 2 - High Control 3026 I/P Module - Stage 2 - Low Control Identifying Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector End View & Functions 15357038 ...
  • Page 15 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Control 3026 I/P Module - Stage 2 - Low Control 3027 I/P Module - Stage 2 - High Control 2161 Side Impact Sensor - Left - Voltage (AJ7) 2162 Side Impact Sensor - Left - Signal (AJ7)
  • Page 16 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 12110288  Connector Part Information 2-Way F Metri-Pack 280 Series (YE)  Wire Color Circuit No. Function 2103 Side Impact Module - Right - High Control D-BU 2104 Side Impact Module - Right - Low Control Identifying Inflatable Restraint Side Impact Sensor (SIS) - Left (AJ7) - Connector End View &...
  • Page 17 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Identifying Inflatable Restraint Side Impact Sensor (SIS) - Right (AJ7) - Connector End View & Functions 15356722  Connector Part Information 2-Way F GT 150 Sealed 4.0 (YE)  Wire Color Circuit No.
  • Page 18 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Control Steering Wheel Module - Stage 1 - Low 3020 Control Steering Wheel Module - Stage 2 - High 3023 Control Steering Wheel Module - Stage 2 - Low 3022 Control Identifying Inflatable Restraint Steering Wheel Module Coil C2 Connector End View &...
  • Page 19 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 12186989  Connector Part Information 2-Way M Metri-Pack 280 Series P2S (PK)  Wire Color Circuit No. Function Steering Wheel Module - Stage 2 - High 3023 Control Steering Wheel Module - Stage 2 - Low...

  • Page 20: Diagnostic Information And Procedures

    2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Wire Color Circuit No. Function 1327 DIC Fuel Signal (STW) D-BU DIC Toggle Switch Signal (STW) 1358 D-GN DIC Switch Signal (STW) 1816 DIC Set/Reset Switch Signal (STW) 2283 12 Volt Reference (STW)
  • Page 21 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Proper AIR BAG warning lamp operation  Ability of the SDM to communicate through the data link connector (DLC)  Existence of SIR current and/or history diagnostic trouble codes (DTC) ...
  • Page 22 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Go to Step 4 Communications 1. Use the scan tool to request the SIR diagnostic trouble code (DTC) display. 2. Record the displayed DTC(s) on the repair order, specifying as current or history.
  • Page 23 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Driver Seat Belt A/D Data Volts 12 volts Driver Side Belt Status Inputs Buckled/Unbuckled Buckled Module 1 Driver Side Impact Sensor ID 2-digit number Information Module 1 Electronic Front End Sensor 1 ID...
  • Page 24 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender The scan tool displays Buckled or Unbuckled. The signal from the driver seat belt switch indicates whether the driver seat is buckled or unbuckled. Driver Side Impact Sensor ID The scan tool displays a 2 digit ID number. The ID signal is sent to the SDM from the Driver SIS.
  • Page 25 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender B0014, B0016, DTC B0012, B0013, B0014, B0016, B0017, or B0017, or B0018 B0018 B0022, B0024, B0026, B0042, DTC B0022, B0024, B0026, B0042, B0043, or B0043, or B0044 B0044 B0028, B0029, DTC B0028, B0029, or B0030...
  • Page 26 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender The I/P module high circuit is less than 2.4 volts and the I/P module deployment loop is more than  6 ohms for 500 milliseconds. The I/P module deployment loop resistance is more than 4.8 ohms for 500 milliseconds.
  • Page 27 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender B0014 or B0018 is present, test the I/P module high and low circuits for a short-to-ground, and for a short-to-voltage in stage 1 or stage 2. DTC B0012, B0013, B0014, B0016, B0017 or B0018...
  • Page 28 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender OF COLUMN and PASSENGER INFLATOR connectors. 2. Turn ON the ignition, with the engine OFF. 3. With the scan tool, request the SIR DTC display. Does the scan tool indicate that DTC B0012, B0013,...
  • Page 29 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 2. Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement. Did you complete the replacement? Go to Step 9 1. Connect all SIR components. 2. Turn ON the ignition, with the engine OFF.
  • Page 30 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender loop resistance is less than 6 ohms for 500 milliseconds. DTC B0026 (stage 1) or B0044 (stage 2) will set when one of the following conditions occurs:  The steering wheel module high circuit is less than 2.4 volts and the steering wheel module ...
  • Page 31 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender and for high resistance in stage 1 or stage 2. DTC B0022, B0024, B0026, B0042, B0043 or B0044 Step Action Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views...
  • Page 32 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender module coil connector. See Special Tools and Equipment. Use BASE OF COLUMN and PASSENGER INFLATOR connectors. 2. Turn ON the ignition, with the engine OFF. 3. Use the scan tool to request SIR DTCs displayed.
  • Page 33 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender steering wheel module for a short between the high and low circuits in stage 1 or stage 2. 2. If DTC B0024 or B0043 is present, test the steering wheel module high and low circuits for a short to ground and for a short to voltage in stage 1 or stage 2.
  • Page 34 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Circuit Description The passenger side deployment loop consists of the following components: An inflatable restraint side-impact module-RF  The inflatable restraint side-impact module wiring harness  The side-impact module-RF high circuits ...
  • Page 35 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Diagnostic Aids The following conditions are possible causes of the malfunction: A short between the side-impact module-RF high circuits and low circuits.  An open or a high resistance in the side-impact module-RF high or low circuits.
  • Page 36 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender and Connector Repairs in Wiring Systems. Does connector exhibit any signs of damage or corrosion? Go to Step 3 Go to Step 4 1. If the in-line connector for the side impact...
  • Page 37 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 2. Disconnect and remove both the J 38715-A and adapter. See Special Tools and Equipment. 3. Disconnect the inflatable restraint SDM connector. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement.
  • Page 38 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Did you complete the replacement? Go to Step 11 1. Connect all SIR components. 2. Turn ON the ignition, with the engine OFF. 3. Use the scan tool in order to clear the DTCs.
  • Page 39 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender A side-impact module-LF high circuit is less than 2.4 volts, and the side-impact module-LF  deployment loop resistance is less than 6 ohms for 500 milliseconds. Action Taken When the DTC Sets The SDM commands the AIR BAG indicator ON via Class 2 serial data.
  • Page 40 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Did you perform a Diagnostic System Check-SIR? Go to Diagnostic System Check - Go to Step 2 1. Turn OFF the ignition. 2. Disconnect the side-impact module-LF wiring harness in-line connector. Refer to Inflatable Restraint Side Impact Module Replacement - Front.
  • Page 41 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 4. Remove the side-impact module-LF connector. Refer to Inflatable Restraint Side Impact Module Replacement - Front. 5. Use J 38715-30A adapter to connect the J 38715- A to the side-impact module-LF connector. See Special Tools and Equipment.
  • Page 42 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Inflatable Restraint Side Impact Module Replacement - Front. Did you complete the replacement? Go to Step 11 1. Turn OFF the ignition. 2. Replace the side-impact module-LF wiring harness. Refer to Wiring Harness Replacement - Front Door .
  • Page 43 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Action Taken When the DTC Sets The SDM turns the AIR BAG indicator ON.  The SDM records crash data.  Conditions for Clearing the DTC DTC B0051 is a latched code. You cannot clear a latched code. Replace the SDM after following the instructions in the diagnostic table.
  • Page 44 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender as required following an accident. Refer to Repairs and Inspections Required After a Collision. Did you complete the action? Go to Step 6 1. Reconnect all SIR components. 2. Use the scan tool in order to clear the DTCs.
  • Page 45 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender DTC B0053 will be accompanied by another DTC (other than DTC B1000 and DTC B0051). Repair the malfunction causing the other DTCs before installing a new SDM. DTC B0053 Step Action...
  • Page 46 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset? Go to Step 2 System OK DTC B0077, B0078, B0079, B0080, B0081 OR B0082 Circuit Description The inflatable restraint side impact sensor (SIS) utilizes a unidirectional 2-wire circuit.
  • Page 47 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender A history DTC will clear once 255 malfunction free ignition cycles have occurred.  Diagnostic Aids The following can cause an intermittent condition: A short between the SIS signal and voltage circuits ...
  • Page 48 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Does the SIS terminals or harness connector exhibit any signs of damage or corrosion? Go to Step 4 Go to Step 5 1. If the SIS terminals are damaged, replace the SIS.
  • Page 49 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 3. If DTC B0078 is current, test the right SIS signal and voltage circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?
  • Page 50 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Conditions for Running the DTC Ignition 1 voltage is within the normal operating voltage range. Conditions for Setting the DTC DTC B0100 and B0103 will set when one of the following conditions occur: ...
  • Page 51 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 6: Tests for a short to ground, a high resistance or an open in the EFS signal circuit. 7: Tests for a short to ground, a high resistance or an open in the EFS voltage circuit.
  • Page 52 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? Go to Step 13 Go to Step 6 1. If DTC B0100 is current, test the left EFS signal circuit for a short to ground, a high resistance, or an open.
  • Page 53 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Does the DTC reset? Go to Step 11 System OK Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement. Did you complete the replacement? Go to Step 13 For DTC B0101 and B0102 replace the left EFS.
  • Page 54 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender When the SDM detects that no DTCs are present, the SDM commands the AIR BAG indicator OFF. Diagnostic Aids DTC B1001 is an indication that the restraint IDs stored in both the BCM and SDM do not match or that the VINs stored in both the BCM and SDM do not match.
  • Page 55 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Program the BCM in order for the BCM to learn the restraints ID from the SDM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Did you complete the programming procedures?
  • Page 56 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the SIR system. Refer to Checking  Aftermarket Accessories in Wiring Systems. Inspect the easily accessible or visible system components for obvious damage or conditions which could ...
  • Page 57 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender fuse. 12: Tests for an open or high resistance in the ignition 1 voltage circuit to the SIR fuse. 14: Tests for an open or high resistance in the SDM ground circuit or if there is a malfunctioning SDM.
  • Page 58 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender warning lamp ON. Does the AIR BAG warning lamp command Go to Step 6 Go to Step 17 1. Establish communication with the inflatable restraint sensing and diagnostic module (SDM). 2. Use the scan tool to request the SIR DTC display.
  • Page 59 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Does the resistance measure within the specified value? Go to Step 12 Go to Step 11 Locate and repair an open or high resistance in the ignition 1 circuit between the SIR fuse and the SDM wiring harness connector.
  • Page 60 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Cluster system components. 2. Verify that all components, connectors, and CPAs are properly mounted. Go to Have all SIR and Instrument Cluster Diagnostic components been properly connected and System Check -...

  • Page 61: Repair Instructions

    2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 10: SIR Disabling & Enabling Zones Courtesy of GENERAL MOTORS CORP. SIR Disabling and Enabling Zones Zone Description Inflatable Restraint Electronic Frontal Sensors (EFS). Refer to SIR Disabling and Enabling Zone 1.
  • Page 62 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Do not expose inflator modules to temperatures above 65°C (150°F).  Verify the correct replacement part number. Do not substitute a component from a different vehicle.  Use only original replacement parts available from your authorized dealer. Do not use salvaged parts for ...
  • Page 63 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 11: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. IMPORTANT: With the SIR fuse removed and the ignition ON, the AIR BAG indicator illuminates. This is normal operation and does not indicate an SIR system malfunction.
  • Page 64 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 12: View Of Connector Position Assurance At Front End Sensor Connectors Courtesy of GENERAL MOTORS CORP. 7. Remove the Connector Position Assurance (CPA) from both (2) electronic frontal sensor (EFS) connectors.
  • Page 65 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 13: View Of Connector Position Assurance At Front End Sensor Connectors Courtesy of GENERAL MOTORS CORP. 2. Connect the EFS connectors to both (2) EFS's. 3. Install the CPAs to both EFS connectors.
  • Page 66 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 14: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. 6. Install the SIR fuse into the fuse block (1) located in the underhood fuse block. 7. Staying well away from all air bags, turn ON the ignition, with the engine OFF.
  • Page 67 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 3. Remove the key from the ignition. Fig. 15: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. IMPORTANT: With the SIR fuse removed and the ignition ON, the AIR BAG indicator illuminates.
  • Page 68 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 16: View Of Connector Position Assurance (CPA) & Side Impact Sensor Yellow 2-Way Connector Courtesy of GENERAL MOTORS CORP. 6. Remove the connector position assurance (CPA) (3) from the side impact sensor yellow 2-way connector (5) located near the bottom left of the door.
  • Page 69 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 17: View Of Connector Position Assurance (CPA) & Side Impact Sensor Yellow 2-Way Connector Courtesy of GENERAL MOTORS CORP. 2. Connect the side impact sensor yellow 2-way connector (5) located near the bottom left of the door.
  • Page 70 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 18: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. 5. Install the SIR fuse to the fuse block (1) located in the underhood fuse block. 6. Staying well away from all air bags, turn ON the ignition, with the engine OFF.
  • Page 71 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 3. Remove the key from the ignition. 4. Remove the trim panel. Refer to Trim Panel Replacement - Knee Bolster in Instrument Panel, Gages, and Console. Fig. 19: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP.
  • Page 72 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 20: Disconnecting/Reconnecting CPA & Steering Wheel Module Yellow 4-Way Connector Courtesy of GENERAL MOTORS CORP. 6. Remove the connector position assurance (CPA) (1) from the steering wheel module yellow 4-way connector (2) located left of the steering column near the knee bolster.
  • Page 73 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 21: Disconnecting/Reconnecting CPA & Steering Wheel Module Yellow 4-Way Connector Courtesy of GENERAL MOTORS CORP. 2. Connect the steering wheel module yellow 4-way connector (2) located left of the steering column near the knee bolster.
  • Page 74 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 22: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. 4. Install the SIR fuse to the fuse block (1) located in the underhood fuse block. 5. Staying well away from all air bags, turn ON the ignition, with the engine OFF.
  • Page 75 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 3. Remove the key from the ignition. 4. Access I/P module connector through glove box. Fig. 23: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. IMPORTANT: With the SIR fuse removed and the ignition ON, the AIR BAG indicator illuminates.
  • Page 76 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 24: Locating IP Module 4-Way Yellow Connector Behind IP Support Courtesy of GENERAL MOTORS CORP. 6. Remove the CPA from the I/P module yellow 4-way connector (1) located behind the I/P support.
  • Page 77 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 25: Locating IP Module 4-Way Yellow Connector Behind IP Support Courtesy of GENERAL MOTORS CORP. 2. Connect the I/P module yellow 4-way connector (1) located behind the main I/P support.
  • Page 78 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 26: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. 4. Install the SIR fuse to the fuse block (1) located in underhood fuse block. 5. Staying well away from all air bags, turn ON the ignition, with the engine OFF.
  • Page 79 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 3. Remove the key from the ignition. Fig. 27: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. IMPORTANT: With the SIR fuse removed and the ignition ON, the AIR BAG indicator illuminates.
  • Page 80 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 28: View Of Connector Position Assurance (CPA) & Side Impact Sensor Yellow 2-Way Connector Courtesy of GENERAL MOTORS CORP. 6. Remove the connector position assurance (CPA) (3) from the side impact sensor yellow 2-way connector (5) located near the bottom right of the door.
  • Page 81 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 29: View Of Connector Position Assurance (CPA) & Side Impact Sensor Yellow 2-Way Connector Courtesy of GENERAL MOTORS CORP. 2. Connect the side impact sensor yellow 2-way connector (5) located near the bottom right of the door.
  • Page 82 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 30: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. 5. Install the SIR fuse to the fuse block (1) located in the underhood fuse block. 6. Staying well away from all air bags, turn ON the ignition, with the engine OFF.
  • Page 83 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 3. Remove the key from the ignition. Fig. 31: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. IMPORTANT: With the SIR fuse removed and the ignition ON, the AIR BAG indicator illuminates.
  • Page 84 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 32: Identifying CPA Clip Courtesy of GENERAL MOTORS CORP. 5. Remove the CPA from the LF side impact module yellow 2-way connector (1) located under the driver seat. 6. Disconnect the LF side impact module yellow 2-way connector (1) located under the driver seat.
  • Page 85 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 33: Identifying CPA Clip Courtesy of GENERAL MOTORS CORP. 2. Connect the LF side impact module yellow 2-way connector (1) located under the driver seat. 3. Install the CPA to the LF side impact module yellow 2-way connector (1) located under the driver seat.
  • Page 86 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 34: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. 4. Install the SIR fuse to the fuse block (1) located in the underhood fuse block. 5. Staying well away from all air bags, turn ON the ignition, with the engine OFF.
  • Page 87 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 4. Remove the trim panel. Refer to Trim Panel Replacement - Knee Bolster in Instrument Panel, Gages, and Console. 5. Access the I/P module connector through the glove box. Fig. 35: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP.
  • Page 88 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 36: Disconnecting/Reconnecting CPA & Steering Wheel Module Yellow 4-Way Connector Courtesy of GENERAL MOTORS CORP. 7. Remove the connector position assurance (CPA) (1) from the steering wheel module yellow 4-way connector (2) located left of the steering column near the knee bolster.
  • Page 89 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 37: Locating IP Module 4-Way Yellow Connector Behind IP Support Courtesy of GENERAL MOTORS CORP. 9. Remove the CPA from the I/P module yellow 4-way connector (1) located behind the I/P support.
  • Page 90 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 38: Identifying CPA Clip Courtesy of GENERAL MOTORS CORP. 11. Remove the CPA from the RF side impact module yellow 2-way connector (1) located under the passenger seat. 12. Disconnect the RF side impact module yellow 2-way connector (1) located under the passenger seat.
  • Page 91 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 39: Identifying CPA Clip Courtesy of GENERAL MOTORS CORP. 13. Remove the CPA from the LF side impact module yellow 2-way connector (1) located under the driver seat. 14. Disconnect the LF side impact module yellow 2-way connector (1) located under the driver seat.
  • Page 92 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 40: Disconnecting/Reconnecting CPA & Steering Wheel Module Yellow 4-Way Connector Courtesy of GENERAL MOTORS CORP. 2. Connect the steering wheel module yellow 4-way connector (2) located left of the steering column near the knee bolster.
  • Page 93 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 41: Locating IP Module 4-Way Yellow Connector Behind IP Support Courtesy of GENERAL MOTORS CORP. 4. Connect the I/P module yellow 4-way connector (1) located behind the I/P support. 5. Install the CPA to the I/P module yellow 4-way connector (1) located behind the I/P support.
  • Page 94 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 42: Identifying CPA Clip Courtesy of GENERAL MOTORS CORP. 6. Connect the RF side impact module yellow 2-way connector (1) located under the passenger seat. 7. Install the CPA to the RF side impact module yellow 2-way connector (1) located under the passenger...
  • Page 95 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 43: Identifying CPA Clip Courtesy of GENERAL MOTORS CORP. 8. Connect the LF side impact module yellow 2-way connector (1) located under the driver seat. 9. Install the CPA to the LF side impact module yellow 2-way connector (1) located under the driver seat.
  • Page 96 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 44: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. 10. Install the SIR fuse to the fuse block (1) located in the underhood electrical center. 11. Staying well away from all air bags, turn ON the ignition, with the engine OFF.
  • Page 97 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 3. Remove the key from the ignition. Fig. 45: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. IMPORTANT: With the SIR fuse removed and the ignition ON, the AIR BAG indicator illuminates.
  • Page 98 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 46: Identifying CPA Clip Courtesy of GENERAL MOTORS CORP. 5. Remove the CPA from the RF side impact module yellow 2-way connector (1) located under the passenger seat. 6. Disconnect the RF side impact module yellow 2-way connector (1) located under the passenger seat.
  • Page 99 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 47: Identifying CPA Clip Courtesy of GENERAL MOTORS CORP. 2. Connect the RF side impact module yellow 2-way connector (1) located under the passenger seat. 3. Install the CPA to the RF side impact module yellow 2-way connector (1) located under the passenger...
  • Page 100 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 48: View Of Fuse & Relay Block Courtesy of GENERAL MOTORS CORP. 4. Install the SIR fuse to the fuse block (1) located in the underhood fuse block. 5. Staying well away from all air bags, turn ON the ignition, with the engine OFF.
  • Page 101 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender CAUTION: Refer to SIR Caution in Cautions and Notices. 1. Disable the SIR system. Refer to SIR Disabling and Enabling Zone 1. 2. Remove the grille. Refer to Grille Replacement in Exterior Trim.
  • Page 102 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 50: Moving/Repositioning Headlamp Wire Harness Courtesy of GENERAL MOTORS CORP. 4. Raise and support the headlamp wire harness (1) to gain access to the front end sensor.
  • Page 103 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 51: Removing/Installing Sensor Retaining Bolts Courtesy of GENERAL MOTORS CORP. 5. Loosen the bolts (1) retaining the sensor to the frame.
  • Page 104 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 52: Removing/Installing Sensor Assembly Courtesy of GENERAL MOTORS CORP. 6. Remove the sensor assembly from the frame (1).
  • Page 105 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 53: View Of Connector Position Assurance At Front End Sensor Connectors Courtesy of GENERAL MOTORS CORP. 7. Position the sensor assembly above the front bumper. 8. Remove the retaining bolts and protective cover (1) from the sensor.
  • Page 106 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 54: View Of Connector Position Assurance At Front End Sensor Connectors Courtesy of GENERAL MOTORS CORP. 2. Position the sensor assembly horizontally above the front bumper. 3. Connect the sensor (2) electrical connector.
  • Page 107 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 55: Removing/Installing Sensor Assembly Courtesy of GENERAL MOTORS CORP. 6. Position the sensor assembly horizontally to the frame (1). 7. Point the arrow on the sensor toward the front of the vehicle.
  • Page 108 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 56: Removing/Installing Sensor Retaining Bolts Courtesy of GENERAL MOTORS CORP. NOTE: Refer to Fastener Notice in Cautions and Notices. 8. Install the 2 bolts (1) retaining the discriminating sensor assembly to the frame.
  • Page 109 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 57: Moving/Repositioning Headlamp Wire Harness Courtesy of GENERAL MOTORS CORP. 9. Position the headlamp wire harness (1) to the retaining clip.
  • Page 110 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 58: Disconnecting/Reconnecting Headlamp Wire Harness Retaining Clip Courtesy of GENERAL MOTORS CORP. 10. Install and secure the headlamp wire harness in the retaining clip (1). 11. Install the grille. Refer to Grille Replacement in Exterior Trim.
  • Page 111 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender repairs. CAUTION: Refer to SIR Caution in Cautions and Notices. 1. Disable the SIR system. Refer to SIR Disabling and Enabling Zone 2 and SIR Disabling and Enabling Zone 6. 2. Remove the front door trim panel. Refer to Trim Panel Replacement - Side Front Door in Doors.
  • Page 112 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Courtesy of GENERAL MOTORS CORP. 4. Remove the screws that retain the side impact sensor (2) to the door. 5. Disconnect the impact sensor electrical connector (1) from the side impact sensor.
  • Page 113 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 2. Position the side impact sensor (2) horizontally to the door. 3. Connect the electrical connector (1) to the side impact sensor (2). NOTE: Refer to Fastener Notice in Cautions and Notices.
  • Page 114 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 61: Disconnecting/Reconnecting Electrical Connectors At SDM Courtesy of GENERAL MOTORS CORP. 4. Position the rear carpet in order to access the sensing and diagnostic module (SDM). 5. Disconnect the electrical connectors (2) from the SDM (1).
  • Page 115 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 62: Removing/Installing SDM Retaining Nuts Courtesy of GENERAL MOTORS CORP. 6. Remove the nuts that retain the SDM to the floor panel. 7. Remove the SDM from the vehicle. Installation Procedure...
  • Page 116 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 63: Removing/Installing SDM Retaining Nuts Courtesy of GENERAL MOTORS CORP. 2. Install the SDM horizontally to the vehicle. 3. Point the arrow on the SDM towards the front of the vehicle.
  • Page 117 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 64: Disconnecting/Reconnecting Electrical Connectors At SDM Courtesy of GENERAL MOTORS CORP. 5. Connect the electrical connectors (2) to the SDM (1). 6. Return the carpet to the fully installed position.
  • Page 118 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender ensure that the SDM is set properly. 9. Enable the SIR system. Refer to SIR Disabling and Enabling Zone 8. INFLATABLE RESTRAINT STEERING WHEEL MODULE REPLACEMENT Removal Procedure CAUTION: Refer to SIR Inflator Module Handling and Storage Caution in Cautions and Notices.
  • Page 119 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 65: Removing/Installing Leaf Spring Fasteners Courtesy of GENERAL MOTORS CORP. 2. Using a blunt-ended tool, push the leaf spring fasteners (2) inward through the access holes. The access holes are located on both sides of the steering wheel shroud.
  • Page 120 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 66: Removing/Installing Inflatable Restraint Module To/From Steering Wheel Courtesy of GENERAL MOTORS CORP. 3. Lift and partially remove the inflatable restraint steering wheel module from the steering wheel in order to expose the electrical connectors (1).
  • Page 121 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 67: Removing/Installing Inflatable Restraint Module To/From Steering Wheel Courtesy of GENERAL MOTORS CORP. 1. Position the inflatable restraint module to the steering wheel. 2. Connect the electrical connectors (1) to the inflatable restraint steering wheel module.
  • Page 122 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 68: Removing/Installing Leaf Spring Fasteners Courtesy of GENERAL MOTORS CORP. 4. Position the alignment posts of the inflatable restraint module to the holes that are located on the steering wheel housing.
  • Page 123 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Removal Procedure Fig. 69: Removing/Installing Plastic Mounted Steering Column Bracket Courtesy of GENERAL MOTORS CORP. CAUTION: Refer to SIR Caution in Cautions and Notices. 1. Disable the SIR system. Refer to SIR Disabling and Enabling Zone 3.
  • Page 124 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender piece. If the steering wheel does not have PAD control, the inflatable restraint steering wheel module coil will come off by itself. 6. Remove the wire harness strap. 7. If the steering wheel has PAD control, remove the wire harness assembly. Refer to Steering Column Wire Harness Assembly Replacement in Steering Wheel and Column.
  • Page 125 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 71: Installing Wave Washer Courtesy of GENERAL MOTORS CORP. 1. If necessary, install the wave washer (1).
  • Page 126 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 72: View Of Block Tooth Of Steering Shaft Assembly In 12 O'clock Position Courtesy of GENERAL MOTORS CORP. 2. Align the block tooth on the steering shaft assembly (1) to the 12 o'clock position.
  • Page 127 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 73: Installing Inflatable Restraint Steering Wheel Module Coil Courtesy of GENERAL MOTORS CORP. IMPORTANT: A new inflatable restraint steering wheel module coil is pre-centered. Do not remove the centering tab from the new inflatable restraint steering wheel module coil until installation is complete.
  • Page 128 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 6. Remove and discard the centering tab from the coil. Fig. 74: Installing Retaining Ring Courtesy of GENERAL MOTORS CORP. IMPORTANT: The retaining ring (1) must seat securely on the groove of the race and upper shaft assembly (2).
  • Page 129 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 75: Removing/Installing Plastic Mounted Steering Column Bracket Courtesy of GENERAL MOTORS CORP. CAUTION: Refer to SIR Inflator Module Coil Caution in Cautions and Notices. 8. If the steering wheel has PAD control, install the wire harness assembly. Refer to Steering Column Wire Harness Assembly Replacement in Steering Wheel and Column.
  • Page 130 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender CAUTION: Refer to SIR Caution in Cautions and Notices. CAUTION: Refer to SIR Inflator Module Handling and Storage Caution in Cautions and Notices. 1. Disable the SIR System. Refer to SIR Disabling and Enabling Zone 5.
  • Page 131 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 77: Removing/Installing Passenger Air Duct Extension Screw Courtesy of GENERAL MOTORS CORP. 3. Remove the passenger air duct extension screw (1).
  • Page 132 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 78: Removing/Installing Air Duct Extension Courtesy of GENERAL MOTORS CORP. 4. Remove the air duct extension from the front of the I/P.
  • Page 133 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 79: Removing/Installing 2 Lower Passenger Supplemental Inflatable Restraint (PSIR) Inflator Module Retaining Bolts Courtesy of GENERAL MOTORS CORP. 5. Open the I/P compartment door to a full down position. 6. Remove the 2 lower passenger supplemental inflatable restraint (PSIR) inflator module retaining bolts...
  • Page 134 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 80: Removing/Installing Side Retaining Nuts At PSIR Inflator Module Courtesy of GENERAL MOTORS CORP. 7. Remove the 2 side retaining nuts from the PSIR inflator module.
  • Page 135 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 81: Removing/Installing PSIR Inflator Module Courtesy of GENERAL MOTORS CORP. 8. Remove the PSIR inflator module from the front of the I/P carrier. 9. Fully deploy the module before disposal. If the module was replaced under warranty, fully deploy and dispose of the module after the required retention period.
  • Page 136 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 82: Removing/Installing PSIR Inflator Module Courtesy of GENERAL MOTORS CORP. 1. Install the PSIR inflator module to the front of the I/P carrier.
  • Page 137 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 83: Removing/Installing Side Retaining Nuts At PSIR Inflator Module Courtesy of GENERAL MOTORS CORP. NOTE: Refer to Fastener Notice in Cautions and Notices. 2. Install the 2 side retaining nuts to the PSIR inflator module.
  • Page 138 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 84: Removing/Installing 2 Lower Passenger Supplemental Inflatable Restraint (PSIR) Inflator Module Retaining Bolts Courtesy of GENERAL MOTORS CORP. 3. Install the 2 retaining bolts (1) to the PSIR inflator module.
  • Page 139 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 85: Removing/Installing Air Duct Extension Courtesy of GENERAL MOTORS CORP. 4. Install the passenger air duct extension though the front of the I/P.
  • Page 140 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 86: Removing/Installing Passenger Air Duct Extension Screw Courtesy of GENERAL MOTORS CORP. 5. Install the passenger air duct extension screw (1). Tighten: Tighten the screw to 2.5 N.m (22 in. lb.).
  • Page 141 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 87: Identifying Right I/P Access Cover Courtesy of GENERAL MOTORS CORP. 7. Install the passenger side I/P access panel. 8. Enable the SIR System. Refer to SIR Disabling and Enabling Zone 5.
  • Page 142 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender CAUTION: Following the deployment of a side impact air bag, inspect the following parts for damage. Replace these parts if necessary: The seat cushion frame  The seat recliner, if equipped ...
  • Page 143 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 88: Removing/Installing Seat Belt Retractor Push Pins Courtesy of GENERAL MOTORS CORP. 6. Remove the push pin (2) securing the top of the seat belt retractor assembly to the seat back frame.
  • Page 144 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 89: Removing/Installing Screws Securing Inflatable Side Impact Module At Seat Back Frame Courtesy of GENERAL MOTORS CORP. 7. Remove the 2 screws (1) that secure the inflatable side impact module to the seat back frame.
  • Page 145 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 90: Removing/Installing Screws Securing Inflatable Side Impact Module At Seat Back Frame Courtesy of GENERAL MOTORS CORP. NOTE: Refer to Fastener Notice in Cautions and Notices. 2. Install the inflatable side impact module to the seat back frame with the 2 screws (1).
  • Page 146 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 91: Removing/Installing Seat Belt Retractor Push Pins Courtesy of GENERAL MOTORS CORP. 3. Install the top of the seat belt retractor assembly to the seat back frame with the plastic push pin (2).
  • Page 147 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender REPAIRS AND INSPECTIONS REQUIRED AFTER A COLLISION Accident With or Without Inflator Module Deployment - Component Inspections CAUTION: Proper operation of the SIR sensing system requires that any repairs to the vehicle structure return the vehicle structure to the original production configuration.
  • Page 148 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender needed. Accident With Side Air Bag Deployment - Component Replacement and Inspections After a collision involving side air bag deployment, replace the following components. Inflatable restraint side impact sensors (SIS) (Left/Right), on the side of the impact.
  • Page 149 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 92: View Of Proper Handling Of Undeployed Inflator Module Courtesy of GENERAL MOTORS CORP. Use special care when handling or storing live, undeployed, inflator modules. Inflator module deployment produces a rapid generation of gas. This may cause the inflator module or an object in front of the inflator module, to project through the air in the event of an unlikely deployment.
  • Page 150 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender stage 2 may still be active. Therefore, a deployed dual stage inflator module must be treated as an active module. If disposal of a deployed or undeployed dual stage module is required both deployment loops must be energized to deploy the air bag.
  • Page 151 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender J 39401-B SIR Deployment Fixture. See Special Tools and Equipment.  J 38826-75 Steering wheel module adapter  J 38826-80 IP module adapter  1. Turn OFF the ignition. 2. Remove the ignition key.
  • Page 152 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 94: Clearance For Deployment Of Inflator Module Courtesy of GENERAL MOTORS CORP. 6. Clear an area on the floor approximately 1.85 m (6 ft) in diameter for deployment of the inflator module.
  • Page 153 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 95: Identifying I/P Module Components Courtesy of GENERAL MOTORS CORP. 9. When deploying an IP module, refer to the following instructions: Place the J 39401-B (2) in the center of the cleared area. See Special Tools and Equipment.
  • Page 154 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 96: View Of Side Impact Module & Components Courtesy of GENERAL MOTORS CORP. 10. When deploying a side impact module, refer to the following instructions: Place the J 39401-B (3) in the center of the cleared area. See Special Tools and Equipment.
  • Page 155 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Mount the side impact module (1) in the deployment fixture (3) with the vinyl/plastic trim facing  Adjust and secure the J 39401-B arms (4) to the deployment fixture (3). See Special Tools and ...
  • Page 156 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 13. Connect the appropriate pigtail adapter (2) to the SIR deployment harness (1). Fig. 98: Extending SIR Deployment Harness & Adapter Courtesy of GENERAL MOTORS CORP. 14. Extend the SIR deployment harness and adapter to full length from the deployment fixture.
  • Page 157 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 15. Connect the inflator module (1) to the adapter (2) on the SIR deployment harness (3). IMPORTANT: The rapid expansion of gas involved with deploying an inflator  module is very loud. Notify all people in the immediate area that an inflator module will be deployed.
  • Page 158 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender 17. Separate the two banana plugs on the SIR deployment harness. Fig. 101: Connecting SIR Deployment Harness Wires To Power Source Courtesy of GENERAL MOTORS CORP. 18. Place a 12 V minimum/2 A minimum power source, i.e. vehicle battery, near the shorted end of the SIR deployment harness.
  • Page 159 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 102: View Of Deployment Harness Leads Courtesy of GENERAL MOTORS CORP. CAUTION: Refer to SIR Deployed Inflator Modules Are Hot Caution in Cautions and Notices. 21. Seat one banana plug into the other in order to short the deployment harness leads.
  • Page 160 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 103: Disposing Of Deployed Inflator Module Courtesy of GENERAL MOTORS CORP. 23. Put on a pair of shop gloves. 24. Disconnect the pigtail adapter from the inflator module as soon as possible.
  • Page 161 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender The vehicle has completed its useful life.  Irreparable damage occurs to the vehicle in a non-deployment type accident.  Irreparable damage occurs to the vehicle during a theft.  The vehicle is being salvaged for parts to be used on a vehicle with a different VIN as opposed to ...
  • Page 162 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 104: View Of Connector Position Assurance (CPA) & Steering Wheel Module Yellow 4-Way Connector Courtesy of GENERAL MOTORS CORP. 1. Turn OFF the ignition. 2. Remove the ignition key. 3. Put on safety glasses.
  • Page 163 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender column. Fig. 105: Cutting The Steering Wheel Module Harness To Size Courtesy of GENERAL MOTORS CORP. 6. Cut the steering wheel module harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
  • Page 164 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 106: Fabricating 20 Ft. Deployment Harness Courtesy of GENERAL MOTORS CORP. 8. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gage) or thicker multi-strand wire. Use these wires to fabricate the deployment harness.
  • Page 165 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 107: Twisting Connector Wire Leads (High Circuits) To Deployment Harness Wire Courtesy of GENERAL MOTORS CORP. 11. Twist together two connector wire leads, the high circuits from both stages of the steering wheel module, to one set of deployment wires.
  • Page 166 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 108: Bending Twisted Connection Flat Courtesy of GENERAL MOTORS CORP. 13. Bend flat the twisted connection.
  • Page 167 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 109: Insulating Connection With Electrical Tape Courtesy of GENERAL MOTORS CORP. 14. Secure and insulate the connection using electrical tape.
  • Page 168 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 110: Twisting Connector Wire Leads (Low Circuits) To Deployment Harness Wire Courtesy of GENERAL MOTORS CORP. 15. Twist together two connector wire leads, the low circuits from both stages of the steering wheel module, to one set of deployment wires.
  • Page 169 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 111: Bending Twisted Connection Flat Courtesy of GENERAL MOTORS CORP. 17. Bend flat the twisted connection.
  • Page 170 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 112: Insulating Connection With Electrical Tape Courtesy of GENERAL MOTORS CORP. 18. Secure and insulate the connection using electrical tape. 19. Connect the deployment harness to the steering wheel module connector.
  • Page 171 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 113: Routing Wires To Apply Power For Controlled Bag Deployment (Left ) Courtesy of GENERAL MOTORS CORP. 20. Route the deployment harness out of the vehicle's driver side.
  • Page 172 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 114: Disconnecting Side Impact Module Connector Courtesy of GENERAL MOTORS CORP. 21. Disconnect the LF side impact module connector (1) from the vehicle wiring harness (2) located under the LF seat.
  • Page 173 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 115: Cutting The Steering Wheel Module Harness To Size Courtesy of GENERAL MOTORS CORP. 22. Cut the LF side impact module harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
  • Page 174 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 116: Fabricating 20 Ft. Deployment Harness Courtesy of GENERAL MOTORS CORP. 24. Cut 2 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gage) or thicker multi-strand wire. Use these wires to fabricate the deployment harness.
  • Page 175 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 117: Twisting Wires Connector Wire To Deployment Wire Courtesy of GENERAL MOTORS CORP. 27. Twist together one connector wire lead to one deployment wire. 28. Inspect that the previous connection is secure.
  • Page 176 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 118: Twisting & Securing Deployment Wires Courtesy of GENERAL MOTORS CORP. 29. Bend flat the twisted connection. 30. Secure and insulate the connection using electrical tape.
  • Page 177 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 119: Taping Deployment Wires Courtesy of GENERAL MOTORS CORP. 31. Twist together, bend, and tape the remaining connector wire lead to the remaining deployment wire.
  • Page 178 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 120: Routing Wires To Apply Power For Controlled Bag Deployment (Left ) Courtesy of GENERAL MOTORS CORP. 32. Route the deployment harness out of the vehicle's driver side.
  • Page 179 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 121: Removing Connector Position Assurance (CPA) From I/P Module Yellow 4-Way Connector - Zone 5 Courtesy of GENERAL MOTORS CORP. 33. Disconnect the inflatable restraint IP module connector (1) located behind the IP module (3).
  • Page 180 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 122: Cutting The Steering Wheel Module Harness To Size Courtesy of GENERAL MOTORS CORP. IMPORTANT: This vehicle is equipped with dual stage air bags. The steering wheel module and IP module will each have 4 wires. Refer to SIR Connector End Views for determining high and low circuits.
  • Page 181 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 123: Fabricating 20 Ft. Deployment Harness Courtesy of GENERAL MOTORS CORP. 36. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gage) or thicker multi-strand wire. These wires will be used to fabricate the deployment harness.
  • Page 182 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 124: Twisting Connector Wire Leads (High Circuits) To Deployment Harness Wire Courtesy of GENERAL MOTORS CORP. 39. Twist together two connector wire leads, the high circuits from both stages of the IP module, to one set of deployment wires.
  • Page 183 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 125: Bending Twisted Connection Flat Courtesy of GENERAL MOTORS CORP. 41. Bend flat the twisted connection.
  • Page 184 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 126: Insulating Connection With Electrical Tape Courtesy of GENERAL MOTORS CORP. 42. Secure and insulate the connection using electrical tape.
  • Page 185 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 127: Twisting Connector Wire Leads (Low Circuits) To Deployment Harness Wire Courtesy of GENERAL MOTORS CORP. 43. Twist together two connector wire leads, the low circuits from both stages of the IP module, to one set of deployment wires.
  • Page 186 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 128: Bending Twisted Connection Flat Courtesy of GENERAL MOTORS CORP. 45. Bend flat the twisted connection.
  • Page 187 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 129: Insulating Connection With Electrical Tape Courtesy of GENERAL MOTORS CORP. 46. Secure and insulate the connection using electrical tape. 47. Connect the deployment harness to the IP module connector.
  • Page 188 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 130: Routing Wires To Apply Power For Controlled Bag Deployment (Right ) Courtesy of GENERAL MOTORS CORP. 48. Route the deployment harness out of the vehicle's passenger side.
  • Page 189 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 131: Disconnecting Side Impact Module Connector Courtesy of GENERAL MOTORS CORP. 49. Disconnect the RF side impact module connector (1) from the vehicle wiring harness (2) located under the RF seat.
  • Page 190 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 132: Cutting The Steering Wheel Module Harness To Size Courtesy of GENERAL MOTORS CORP. 50. Cut the RF side impact module harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
  • Page 191 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 133: Fabricating 20 Ft. Deployment Harness Courtesy of GENERAL MOTORS CORP. 52. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gage) or thicker multi-strand wire. Use these wires to fabricate the deployment harness.
  • Page 192 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 134: Twisting Wires Catch on to Wire To Deployment Wire Courtesy of GENERAL MOTORS CORP. 55. Twist together one connector wire lead to one deployment wire. 56. Inspect that the previous connection is secure.
  • Page 193 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 135: Twisting & Securing Deployment Wires Courtesy of GENERAL MOTORS CORP. 57. Bend flat the twisted connection. 58. Secure and insulate the connection using electrical tape.
  • Page 194 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 136: Taping Deployment Wires Courtesy of GENERAL MOTORS CORP. 59. Twist together, bend, and tape the remaining connector wire lead to the remaining deployment wire.
  • Page 195 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 137: Routing Wires To Apply Power For Controlled Bag Deployment (Right) Courtesy of GENERAL MOTORS CORP. 60. Route the deployment harness out of the vehicle's passenger side. 61. Stretch the two driver side harnesses to full length.
  • Page 196 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 138: Routing Wires To Apply Power For Controlled Bag Deployment (Right) Courtesy of GENERAL MOTORS CORP. 64. Place a power source, 12 V minimum/2 A minimum, i.e., a vehicle battery, near the shorted ends of the passenger side deployment harnesses.
  • Page 197 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 139: Routing Wires & Applying Power For Controlled Bag Deployment (Right) Courtesy of GENERAL MOTORS CORP. 71. Twist together one end of each wire of the IP module on the passenger side deployment harness in order to short the wires.
  • Page 198 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 140: Routing Wires To Apply Power For Controlled Bag Deployment (Left ) Courtesy of GENERAL MOTORS CORP. 73. Move the power source, 12 V minimum/2 A minimum, i.e., a vehicle battery, near the shorted ends of the driver side deployment harnesses.

  • Page 199: Description And Operation

    2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 141: Routing Wires To Apply Power For Controlled Bag Deployment (Left ) Courtesy of GENERAL MOTORS CORP. 80. Twist together one end of each wire of the steering wheel module on the driver side deployment harness in order to short the wires.
  • Page 200 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Fig. 142: Illustrating Deployed Inflatable Restraint Courtesy of GENERAL MOTORS CORP. The supplemental inflatable restraint (SIR) system supplements the protection offered by the occupant's seat...
  • Page 201 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender belt system (2). The SIR system may contain several inflator modules located throughout the vehicle, i.e. steering wheel module (1), instrument panel (IP) module (1), side impact modules or roof rail modules. In...
  • Page 202 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender when a deployment occurs and turns the AIR BAG indicator located in the IPC ON. The SDM performs continuous diagnostic monitoring of the SIR system electrical components and circuitry when the ignition is turned ON.
  • Page 203 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender Each dual stage inflator modules is equipped with a shorting bar located in the connector(s) of the module. The shorting bar shorts the inflator module deployment loop circuitry to prevent unwanted deployment of the air bag when it is disconnected.

  • Page 204: Special Tools And Equipment

    2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender bag when servicing the inflator module. Inflatable Restraint Side Impact Sensor (SIS) The side impact sensor (SIS) contains a sensing device (accelerometer) which monitors vehicle acceleration and velocity changes to detect side collisions that are severe enough to warrant air bag deployment. The SIS is not part of the deployment loop, but instead provides an input to the SDM.
  • Page 205 2004 Isuzu Ascender LS 2004 RESTRAINTS SIR - Ascender J 38826 SIR Deployment Harness J 39401-B SIR Deployment Fixture...

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