Chevrolet Silverado / GMC Sierra. Service manual — part 656

Conditions for Setting the DTC

B0015 01, B0016 01, B0019 01, B0020 01, B0022 01, B0023 01

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

B0015 02, B0016 02, B0019 02, B0020 02, B0022 02, B0023 02

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

B0015 04, B0016 04, B0019 04, B0020 04, B0022 04, B0023 04

The air bag module high and/or low circuit is open for 120 milliseconds.

B0015 0D, B0016 0D, B0019 0D, B0020 0D, B0022 0D, B0023 0D

The air bag module deployment loop resistance is greater than 3.9 ohms for 120 milliseconds.

B0015 0E, B0016 0E, B0019 0E, B0020 0E, B0022 0E, B0023 0E

The air bag module deployment loop resistance is less than 1.1 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 event occurs 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 fault-free ignition cycles have occurred.

Diagnostic Aids

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

2008 Chevrolet Silverado 1500

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

Silverado

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 Driver and Passenger SIR Load Tool

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate air bag module. Refer to

the appropriate air bag module replacement procedure.

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 pretensioner

The air bag module

The SDM module

The air bag 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

2. Ignition ON, test for less than 1 volt between the appropriate high control circuit terminal

and ground.

I/P Module - Stage 1 terminal A1 (with 10 series)

I/P Module - Stage 1 terminal A (without 10 series)

I/P Module - Stage 2 terminal B1

Left Front Roof Rail Module terminal B (regular cab)

Left Front Roof Rail Module terminal 1 (extended cab)

Right Front Roof Rail Module terminal B (regular cab)

Right Front Roof Rail Module terminal 1 (extended cab)

Seat Belt Pretensioner - Left terminal B

Seat Belt Pretensioner - Right terminal B

If greater than the specified range, test the circuit for a short to voltage. If the circuit
tests normal, replace the SDM.

3. Test for less than 1 volt between the appropriate low control circuit terminal and ground.

I/P Module - Stage 1 terminal A2 (with 10 series)

I/P Module - Stage 1 terminal B (without 10 series)

I/P Module - Stage 2 terminal B2

Left Front Roof Rail Module terminal A (regular cab)

Left Front Roof Rail Module terminal 2 (extended cab)

Right Front Roof Rail Module terminal A (regular cab)

Right Front Roof Rail Module terminal 2 (extended cab)

Seat Belt Pretensioner - Left terminal A

Seat Belt Pretensioner - Right terminal A

If greater than the specified range, test the circuit for a short to voltage. If the circuit
tests normal, replace the SDM.

4. Ignition OFF, test for infinite resistance between the appropriate high control circuit

terminal and ground.

I/P Module - Stage 1 terminal A1 (with 10 series)

I/P Module - Stage 1 terminal A (without 10 series)

I/P Module - Stage 2 terminal B1

Left Front Roof Rail Module terminal B (regular cab)

Left Front Roof Rail Module terminal 1 (extended cab)

Right Front Roof Rail Module terminal B (regular cab)

2008 Chevrolet Silverado 1500

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

Silverado

Right Front Roof Rail Module terminal 1 (extended cab)

Seat Belt Pretensioner - Left terminal B

Seat Belt Pretensioner - Right terminal B

If not the specified value, test the circuit for a short to ground. If the circuit tests
normal, replace the SDM.

5. Test for infinite resistance between the appropriate low control circuit terminal and ground.

I/P Module - Stage 1 terminal A2 (with 10 series)

I/P Module - Stage 1 terminal B (without 10 series)

I/P Module - Stage 2 terminal B2

Left Front Roof Rail Module terminal A (regular cab)

Left Front Roof Rail Module terminal 2 (extended cab)

Right Front Roof Rail Module terminal A (regular cab)

Right Front Roof Rail Module terminal 2 (extended cab)

Seat Belt Pretensioner - Left terminal A

Seat Belt Pretensioner - Right terminal A

If not the specified value, test the circuit for a short to ground. If the circuit tests
normal, replace the SDM.

6. With the appropriate adaptor, connect J 38715-A in place of the air bag module.

7. Ignition ON, verify the DTC is set as current.

If DTC is not set or is set as history, replace the appropriate air bag module.

8. Ignition OFF, disconnect J 38715-A and the appropriate adaptor.

9. Disconnect the harness connector at the SDM.

10. Test for less then 1 ohm between the following high control circuit terminals.

I/P Module - Stage 1 terminal A1 and SDM terminal 10 (with 10 series)

I/P Module - Stage 1 terminal A and SDM terminal 10 (without 10 series)

I/P Module - Stage 2 terminal B1 and SDM terminal 6

Left Front Roof Rail Module terminal B and SDM terminal 13 (regular cab)

Left Front Roof Rail Module terminal 1 and SDM terminal 13 (extended cab)

Right Front Roof Rail Module terminal B and SDM terminal 14 (regular cab)

Right Front Roof Rail Module terminal 1 and SDM terminal 14 (extended cab)

Seat Belt Pretensioner - Left terminal B and SDM terminal 16

Seat Belt Pretensioner - Right terminal B and SDM terminal 19

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

2008 Chevrolet Silverado 1500

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

Silverado