Express 1500 RWD V8-5.3L (2008)
Air Bag Control Module: Service and Repair
Inflatable Restraint Sensing and Diagnostic Module Replacement
Removal Procedure
Caution: Do not strike or jolt the inflatable restraint sensing and diagnostic module (SDM). Before applying power to the SDM, make
sure that it is securely fastened with the arrow facing toward the front of the vehicle. Failure to observe the correct installation procedure
could cause SIR deployment, personal injury, or unnecessary SIR system repairs.
Caution: Refer to SIR Inflator Module Handling and Storage Caution.
1. Disable the SIR system. Refer to SIR Disabling and Enabling.
2. Remove the driver seat.
3. Fold back the carpet to access the inflatable restraint sensing and diagnostic module (SDM).
4. Remove the connector position assurance (CPA) from the SDM electrical connector.
5. Disconnect the SDM electrical connector.
6. Remove the SDM (2) mounting nuts (1).
7. Remove the SDM (2) from the vehicle.
Important: The following repair procedures should only be used in the event that the inflatable restraint sensing and diagnostic module
(SDM) mounting studs are damaged to the extent that the SDM may no longer be properly mounted.
8. Repair the studs using the following procedure:
1. Remove and discard the stripped nut.
2. Drill out the weld spots for the weld stud that has been damaged, remove and discard the damaged stud.
3. Condition the floor panel attaching surface where the new stud is to be installed.
4. Install new weld stud GM P/N 115115602 and clamp the weld stud into place.
5. Migweld the stud at the drilled holes.
6. Apply body sealer GM P/N 9984248 around any exposed openings.
7. Install a new nut (1) GM P/N 11515933.
Installation Procedure
1. Remove any dirt, grease, or other impurities from the mounting surface.
2. Install the SDM (2) horizontally to the studs.
3. Point the arrow on the SDM toward the front of the vehicle.
Notice: Refer to Fastener Notice.
4. Install the SDM mounting nuts (1).
Tighten the nuts (1) to 10 N.m (89 lb in).
