Chevrolet Silverado / GMC Sierra. Service manual — part 675

INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL REPLACEMENT

Special Tools

J 42640 Steering Column Anti-rotation Pin

Removal Procedure

1. Verify the following before removing the inflatable restraint steering wheel module coil:

The wheels on the vehicle are straight ahead.

That anti-rotation pin J 42640 is installed or the ignition and start switch is in the
LOCK position.

2. Remove the steering wheel. Refer to Steering Wheel Replacement .

3. Remove the steering column shroud. Refer to Steering Column Shroud Replacement .

4. Disconnect any electrical connectors as needed.

2

1. Release the connector position assurance (CPA) retainer.

2. Disconnect the electrical connectors.

3. Fully deploy the module before disposal. If the module was replaced

under warranty, fully deploy and dispose of the module after the required
retention period. Refer to Inflator Module Handling and Scrapping.

NOTE:

The wheels of the vehicle must be straight ahead and the
steering column in the LOCK position before disconnecting the
steering column or intermediate shaft from the steering gear.
Failure to do so will cause the SIR coil assembly to become
uncentered, which may cause damage to the coil assembly.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 14: View Of SIR Coil & Retaining Ring
Courtesy of GENERAL MOTORS CORP.

5. Remove the inflatable restraint steering wheel module coil retaining ring (2) and discard it.

DO NOT reuse the ring.

6. Remove the inflatable restraint steering wheel module coil (1) from the steering shaft.

7. If replacing, discard the old inflatable restraint steering wheel module coil.

Installation Procedure

NOTE:

The new SIR coil assembly will be centered. Improper

2008 Chevrolet Silverado 1500

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

Silverado

1. If reusing the existing inflatable restraint steering wheel module coil it MUST be centered.

Refer to Inflatable Restraint Steering Wheel Module Coil Centering.

alignment of the SIR coil assembly may damage the unit,
causing an inflatable restraint malfunction.

IMPORTANT: Do not remove the centering tab from the new inflatable

restraint steering wheel module coil until the installation is
complete. If the centering tab is missing then re-center the
assembly.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 15: Aligning SIR Coil Assembly With Horn Tower
Courtesy of GENERAL MOTORS CORP.

2. Align the inflatable restraint steering wheel module coil (1) with the horn tower on the turn

signal switch cancel cam (2).

2008 Chevrolet Silverado 1500

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

Silverado