Chevrolet Silverado / GMC Sierra. Manual - part 665
Component Connector End Views
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
1. Verify DTC B0090 39 is not set.
If DTC is set, replace the rollover sensor.
2. Ignition OFF, disconnect the harness connector at the rollover sensor and the SDM.
3. Test for less than 5 ohms between the rollover sensor ground circuit terminal 6 and ground.
If greater then the specified range, test the circuit for an open/high resistance.
4. Test for less than 5 ohms between the serial data circuit terminal 5 and the SDM occupant
sensor serial data circuit terminal 58.
If greater then the specified range, test the circuit for a short to ground or an open/high
resistance.
5. Ignition ON, test for less than 1 volt between the serial data circuit terminal 5 and ground.
IMPORTANT: When removing connectors inspect for damage or corrosion.
Damage or corrosion in the following requires repair or
replacement of the affected component/connector.
The vehicle rollover sensor
The SDM module
The vehicle rollover sensor harness connector
The SDM wiring harness connector
2008 Chevrolet Silverado 1500
2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
If greater then the specified range, test the circuit for a short to voltage.
6. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
If the test lamp does not illuminate, test the circuit for an open/high resistance. If the
circuit fuse is open, test the circuit for a short to ground, if the circuit tests normal,
replace the rollover sensor.
7. With a scan tool, clear DTCs. Verify DTC B0090 is not set.
If DTC is set, replace the SDM.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Inflatable Restraint Vehicle Rollover Sensor Replacement
SIR/SRS Wiring Repairs
Control Module References for SDM and ROS replacement, setup, and programming.
DTC B0098
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using the diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B0098 52
Manual Cutoff Switch Circuit Compare Failure
Diagnostic Fault Information
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
I/P Module Disable Switch
Signal
-
B0098 52
B0098 52
-
I/P Module Enable Switch
Signal
B0098 52
B0098 52
B0098 52
-
Ignition 1 Voltage
B1370 06
B0098 52
-
-
2008 Chevrolet Silverado 1500
2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Circuit/System Description
The inflatable restraint I/P module disable switch is ignition key operated to manually enable or
disable the inflatable restraint I/P module. When the ignition is turned ON, ignition 1 voltage is
supplied to the inflatable restraint I/P module disable switch and based on the position of the
switch either the I/P module disable switch signal circuit (ON) or the I/P module suppression
indicator control (OFF) circuit will be active to the inflatable restraint sensing and diagnostic
module (SDM). The SDM will communicate to the instrument panel cluster (IPC) to illuminate
the appropriate the ON/OFF indicator as well as enable or disable the deployment of the I/P
module. If a malfunction is detected, a DTC will be stored.
Conditions for Running the DTC
Ignition 1 voltage is between 9-16 volts.
Conditions for Setting the DTC
The SDM detects both the I/P module disable switch signal circuit (ON) and the I/P module
suppression indicator control (OFF) circuit active or inactive for 500 milliseconds.
Action Taken When the DTC Sets
The SDM commands the AIRBAG indicator ON.
Conditions for Clearing the DTC
The condition for setting the DTC no longer exists.
A history DTC will clear once 100 malfunction-free ignition cycles have occurred.
Reference Information
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Circuit/System Testing
IMPORTANT: When removing connectors inspect for damage or corrosion.
Damage or corrosion in the following requires repair or
2008 Chevrolet Silverado 1500
2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
1. Ignition OFF, disconnect the harness connector at the inflatable restraint I/P module disable
switch.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal B and
ground.
If the test lamp does not illuminate, test the ignition circuit for a short to ground or an
open/high resistance, if the circuit tests normal and the ignition fuse is open, test or
replace the inflatable restraint I/P module disable switch.
3. Verify that a test lamp illuminates between the I/P module disable switch signal control
circuit terminal E and B+.
If the test lamp does not illuminate, test the control circuit for a short to voltage or an
open/high resistance. If the circuit tests normal, replace the SDM.
4. Verify that a test lamp illuminates between the I/P module suppression indicator control
(OFF) circuit terminal A and B+.
5. If all circuits test normal, test or replace the inflatable restraint I/P module disable switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the inflatable restraint I/P module disable
switch.
2. Test for infinite resistance between the signal circuit terminal A and the signal circuit
terminal E.
If not the specified value, inflatable restraint I/P module disable switch.
3. With the inflatable restraint I/P module disable switch select the OFF position.
4. Test for 90-110 ohms between the ignition circuit terminal B and signal circuit terminal E.
If not the specified range, replace the inflatable restraint I/P module disable switch.
5. With the inflatable restraint I/P module disable switch select the ON position.
6. Test for 3.9K-3.2K ohms between the ignition circuit terminal B and signal circuit terminal
A.
replacement of the affected component/connector.
The inflatable restraint I/P module disable switch
The SDM
The inflatable restraint I/P module wiring harness
connector
The SDM wiring harness connector
2008 Chevrolet Silverado 1500
2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado