GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Astro - 4WD 🢒 Restraints 🢒 SIR 🢒 Inflatable Restraint Sensing and Diagnostic Module Replacement

Removal Procedure

    Caution: Refer to SIR 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.


    Object Number: 466123 Size: SH
  1. Disable the SIR system. Refer to SIR Disabling and Enabling .
  2. Remove the driver seat. Refer to Bucket Seat Replacement in Seats.
  3. Remove the carpet retaining sill trim molding. Refer to Carpet Retainer Replacement in Interior Trim.
  4. Fold back the carpet to access the inflatable restraint sensing and diagnostic module (SDM).
  5. Remove the connector position assurance (CPA) (1) from the inflatable restraint SDM wiring harness connector (2).
  6. Push down the flex lock button (3) and slide the connector locking cover (4) to the open position.

    7. Object Number: 388351 Size: SH
  7. Disconnect the SDM wiring harness connector (2) from the SDM (4).
  8. Remove the SDM mounting fasteners (1).
  9. Remove the SDM (4) from the vehicle (5).

    10. Important: The following repair procedures should only be used in the event that the inflatable restraint SDM mounting studs and/or fasteners are damaged to the extent that the SDM may no longer be properly mounted.

  10. Repair the fasteners using the following procedure:
    11. 10.1. Remove the stripped nut and discard the nut.
    10.2. Drill out the weld spots to the weld stud from the floor pan side, then remove and discard the stud.
    10.3. Condition the floor panel attaching surface where the new stud is to be installed.
    10.4. Install new weld stud GM P/N 115115602 and clamp the weld stud.
    10.5. Migweld the stud at the drilled holes form above or below the floor pan, as required.
    10.6. Apply body sealer around any exposed openings.
    10.7. Install a new fastener GM P/N 11515933.

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

    2. Object Number: 388351 Size: SH
  2. Install the SDM (4) horizontally to the vehicle.
  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 fasteners (1).

    5. Tighten
    Tighten fasteners to 12 N·m (106 lb in).

  5. Connect the SDM wiring harness connector (2) to the SDM (4).

    6. Object Number: 466123 Size: SH
  6. Push down the flex lock button (3) and slide the connector locking cover (4) to the close position.
  7. Install the CPA (1) to the SDM wiring harness connector (2).
  8. Position the carpet to cover the SDM.
  9. Install the carpet retaining sill trim molding. Refer to Carpet Retainer Replacement in Interior Trim.
  10. Install the driver seat. Refer to Bucket Seat Replacement in Seats.

    11. 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.

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