GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Express 🢒 Body and Accessories 🢒 Body Control System 🢒 Inflatable Restraint Sensing and Diagnostic Module Replacement

Removal Procedure

    Caution: Refer to SIR Inflator Module Handling and Storage Caution in the Preface section.

    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.

  1. Disable the SIR system. Refer to SIR Disabling and Enabling and SIR Disabling and Enabling .
  2. Remove the driver seat. Refer to Driver and Passenger Seat Replacement in Seats.

    3. Object Number: 854229 Size: SH
  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.

    8. 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:
    9. 8.1. Remove and discard the stripped nut.
    8.2. Drill out the weld spots for the weld stud that has been damaged, remove and discard the damaged stud.
    8.3. Condition the floor panel attaching surface where the new stud is to be installed.
    8.4. Install new weld stud GM P/N 115115602 and clamp the weld stud into place.
    8.5. Migweld the stud at the drilled holes.
    8.6. Apply body sealer GM P/N 9984248 around any exposed openings.
    8.7. Install a new nut (1) GM P/N 11515933.

Installation Procedure
  1. Remove any dirt, grease, or other impurities from the mounting surface.

    2. Object Number: 854229 Size: SH
  2. Install the SDM (2) horizontally to the studs.
  3. Point the arrow on the SDM toward the front of the vehicle.

    4. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the SDM mounting nuts (1).

    5. Tighten
    Tighten the nuts (1) to 10 N·m (89 lb in).

  5. Install the SDM (2) electrical connector.
  6. Install the CPA to the SDM electrical connector.
  7. Install the carpet to cover SDM (2).
  8. Install the driver seat. Refer to Driver and Passenger Seat Replacement in Seats.

    9. Important: The AIR BAG indicator may remain ON after the SDM has been replaced. DTC B1001 may set requiring the SDM part number to be set in multiple modules. If the indicator remains ON after enabling the SIR system, perform the diagnostic system check and follow the steps thoroughly to ensure that the SDM is set properly.

  9. Enable the SIR system. Refer to SIR Disabling and Enabling and to SIR Disabling and Enabling .