Chevrolet Silverado / GMC Sierra. Service manual — part 654

There are 2 shorting bars used within each connector which will short together both steering
wheel module stage 1 high circuit and steering wheel module stage 1 low circuit and both steering
wheel module stage 2 high circuit and steering wheel module stage 2 low circuit when the
connector is disconnected. This will help to prevent unwanted deployment of the inflator module
during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0012 01 Stage 1 or B0013 01 Stage 2

The steering wheel module high and/or low circuit is short to voltage for 120 milliseconds.

B0012 02 Stage 1 or B0013 02 Stage 2

The steering wheel module high and/or low circuit is short to ground for 120 milliseconds.

B0012 04 Stage 1 or B0013 04 Stage 2

The steering wheel module high and/or low circuit is open for 120 milliseconds.

B0012 0D Stage 1 or B0013 0D Stage 2

The steering wheel module deployment loop resistance is greater than 5.1 ohms for 120
milliseconds.

B0012 0E Stage 1 or B0013 0E Stage 2

The steering wheel module deployment loop resistance is less than 1.3 ohms for 120 milliseconds.

Action Taken When the DTC Sets

The SDM commands the AIR BAG indicator ON.

The SDM will store a DTC, if an event occurs the system will still attempt deployments.

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.

Diagnostic Aids

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

When a harness connector is disconnected, the high control and low control circuits are
shorted together by the integral shorting bar. This should be taken into account when testing
for faults on these circuits.

This DTC usually indicates a poor connection or a wiring malfunction between the SDM
and the deployment loop.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

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

Special Tools Required

J 38715-A SIR Driver/Passenger Load Tool

Circuit/System Testing

IMPORTANT: When removing connectors inspect for damage, corrosion or

poor connection. Damage or corrosion in the following requires
repair or replacement of the affected component/connector.

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

1. Verify that the steering wheel module connector and the connector position assurance

(CPA) are engaged.

If the above condition is found, make the appropriate repair.

2. Ignition OFF, disconnect the steering wheel module.

3. With the appropriate adaptor, connect special tool J 38715-A .

4. Ignition ON, with a scan tool, verify DTC is set as current.

If DTC is not set or is set as history, replace the steering wheel module.

5. Ignition OFF, disconnect special tool J 38715-A .

6. Disconnect the steering wheel module coil in-line connector.

7. With the appropriate adaptor, connect special tool J 38715-A .

8. Ignition ON, with a scan tool, verify DTC is set as current.

If DTC is not set or is set as history, replace the steering wheel module coil.

9. Ignition OFF, disconnect special tool J 38715-A and the appropriate adaptor.

10. Disconnect the harness connector at the SDM.

11. Ignition ON, test for less than 1 volt between the appropriate high circuit and ground.

Steering wheel module coil connector Stage 1 terminal A (X1)

Steering wheel module coil connector Stage 2 terminal A (X2)

If not the specified range, test the circuit for a short to voltage.

12. Test for less than 1 volt between the appropriate low circuit and ground.

Steering wheel module coil connector Stage 1 terminal B (X1)

Steering wheel module coil connector Stage 2 terminal B (X2)

The pretensioner

The air bag module

The SDM module

The air bag wiring harness connector

The SDM wiring harness connector

IMPORTANT: The connector and CPA may seat independent of each other.

Both the connector and CPA should seat with an audible
and/or tactile click. The CPA isolates the shorting-bars
within the connector allowing the deployment circuit to
operate properly.

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

If not the specified range, test the circuit for a short to voltage.

13. Ignition OFF, test for infinite resistance between the appropriate high circuit and ground.

Steering wheel module coil connector Stage 1 terminal A (X1)

Steering wheel module coil connector Stage 2 terminal A (X2)

If not the specified range, test the circuit for a short to ground.

14. Test for infinite resistance between the appropriate low circuit and ground.

Steering wheel module coil connector Stage 1 terminal B (X1)

Steering wheel module coil connector Stage 2 terminal B (X2)

If not the specified range, test the circuit for a short to ground.

15. Test for less then 1 ohm between the SDM connector and the air bag module connector high

circuit.

Steering wheel module coil connector Stage 1 terminal A (X1) and SDM terminal 9

Steering wheel module coil connector Stage 2 terminal A (X2) and SDM terminal 5

If not the specified range, test the circuit for an open/high resistance.

16. Test for less then 1 ohm between the SDM connector and the air bag module connector low

circuit.

Steering wheel module coil connector Stage 1 terminal B (X1) and SDM terminal 8

Steering wheel module coil connector Stage 2 terminal B (X2) and SDM terminal 4

If not the specified range, test the circuit for an open/high resistance.

17. If all circuits test normal, replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Inflatable Restraint Steering Wheel Module Coil Replacement

Inflatable Restraint Steering Wheel Module Replacement

SIR/SRS Wiring Repairs

Control Module References for SDM replacement, setup, and programming

DTC B0014-B0045

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado