Suzuki XL7 2007 Service Manual page 2256

9A-148 Wiring Systems:
Action Taken When the DTC Sets
• The BCM operates in a fail-safe power mode
dependent on the last valid power mode detected and
the state of the engine run flag data on the GMLAN
serial data communications circuits.
• The other modules on the vehicle operate in a fail-
safe power mode dependent on the last valid power
mode transmitted by the BCM and the state of the
engine run flag on the GMLAN serial data
communications circuits.
Conditions for Clearing the DTC
• A current DTC clears when the malfunction is no
longer present.
• A history DTC clears when the module ignition cycle
counter reaches the reset threshold of 50, without a
repeat of the malfunction.
Diagnostic Aids
• A short to ground in the accessory voltage circuit will
cause an open fuse to the ignition switch. DTC U1814
should be current.
• A short to ground in the ignition 1 voltage circuit of the
ignition main relay 31 will cause an open fuse to the
ignition switch. DTC B1428 should be current.
Circuit/System Verification
1. Verify that the following DTCs are not set: U1814, B1428.
➢ If either of the DTCs are set, refer to "Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Information: ".
2. With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed
with the corresponding ignition key position. The PMM Power Mode Parameters table below illustrates the correct
state of these input parameters (circuits) in correspondence to the ignition switch position. The circuits which the
individual parameters are related to are in parentheses.
PMM Power Mode Parameters
Ignition Switch Currant Power
Position
Off Key Out
Off Key IN
Accessory Accessory
Run
Start Crank Request
➢ If any parameters are incorrect in any key position, proceed to the Circuit/System Testing or Component Testing
below.
Ign. Off/Run/Crank
(Off/Run Crank Voltage
Mode
Circuit)
Off Key Out/ACC
Off Key In/Off
Key Out/ACC
Run Run
Crank
• The power modes and controls are determined using
BCM logic. Comparing the Body Control Module
Power Mode data display parameters listed in Circuit/
System Verification will determine if there is a power
mode fault.
Reference Information
Schematic Reference
• "Power Moding Schematics"
• "Power Distribution Schematics"
Connector End View Reference
"Power and Grounding Connector End Views"
Electrical Information Reference
• "Circuit Testing"
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections"
• "Wiring Repairs"
Scan Tool Reference
• "Scan Tool Data List - Wiring Systems and Power
Management"
• "Scan Tool Data Definitions - Wiring Systems and
Power Management"
Ignition Accessory/Run
(Accessory Voltage
Circuit)
Inactive
Inactive
Active
Active
Inactive
Ignition Run/Crank
(Ignition 1 Voltage
Circuit)
Inactive
Inactive
Inactive
Active
Active