Suzuki XL7 2007 Service Manual page 2052

8B-40 Air Bag System:
Action Taken When the DTC Sets
• The SDM commands the AIR BAG indicator ON via
serial data communications.
• The SIR System is disabled and no deployments are
allowed.
Conditions for Clearing the DTC
• The condition responsible for setting the DTC no
longer exists and the scan tool Clear DTCs function is
used.
• A history DTC will clear once 255 malfunction-free
ignition cycles have occurred.
Reference Information
Schematic Reference
"SIR Schematics"
Connector End View Reference
"SIR Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Circuit/System Testing
NOTE
When removing connectors, inspect for
damage or corrosion. Damage or corrosion
in the following requires repair or
replacement of the affected component/
connector:
• The SIS
• The SDM module
• The SIS wiring harness connector
• The SDM wiring harness connector
1. Ignition OFF, disconnect the appropriate SIS
connector.
2. Remove the SDM connector.
3. Test for infinite resistance between the signal circuit
and ground.
➢ If less than infinite resistance, test the circuit for a
short to ground.
4. Ignition ON, test for less than 1 volt between the SIS
signal circuit and ground.
➢ If greater than the specified range, test the circuit
for a short to voltage.
5. Ignition ON, test for less than 1 volt between the SIS
voltage circuit and ground.
➢ If greater than the specified range, test the circuit
for a short to voltage.
6. Test for less then 1 ohm of resistance between the
signal circuit SIS connector and SDM connector.
➢ If greater than the specified range, test the circuit
for an open/high resistance.
7. Test for less then 1 ohm of resistance between the
voltage circuit SIS connector and SDM connector.
➢ If greater than the specified range, test the circuit
for an open/high resistance.
8. If the circuits test normal, replace the appropriate
SIS.
9. Reconnect all SIR components. Ignition ON, with a
scan tool clear and recheck for DTCs.
➢ If the SIS DTC returns and is current, replace the
SDM.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Inflatable Restraint Side Impact Sensor
Replacement"
• "SIR/SRS Wiring Repairs: "
• "Control Module References: " for SDM replacement,
setup, and programming
DTC B0090
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
• Review "Strategy Based Diagnosis: " for an overview
of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: " provides an overview of
each diagnostic category.
DTC Descriptors
DTC B0090 0F: Rollover Sensor Erratic
DTC B0090 3A: Rollover Sensor Incorrect Component
Installed
DTC B0090 39: Rollover Sensor Internal Electronic
Failure
DTC B0090 71: Rollover Sensor Invalid Serial Data
Received
Circuit/System Description
The inflatable restraint vehicle rollover sensor (ROS)
utilizes battery power supply and a bidirectional interface
circuit. The ROS modulates current on the interface to
send ID, State of Health, and deployment commands to
the inflatable restraint sensing and diagnostic module
(SDM). When the ignition is turned on the ROS responds
by performing internal diagnostics and sending an ID to
the SDM. The ROS continually communicates status
messages to the SDM, which determines if a fault is
present in the ROS circuit. If the fault is present, the
SDM will set a diagnostic trouble code (DTC).