GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2002 🢒 Express 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Inflatable Restraint Sensing and Diagnostic Module Replacement

CAUTION: Be careful when you handle a sensing and diagnostic module (SDM). Do not strike or jolt the SDM. Before applying power to the SDM:

   • Remove any dirt, grease, etc. from the mounting surface
   • Position the SDM horizontally on the mounting surface
   • Point the arrow on the SDM toward the front of the vehicle
   • Tighten all of the SDM fasteners and SDM bracket fasteners to the specified torque value
Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

Removal Procedure

Caution: This vehicle is equipped with a Supplemental Inflatable Restraint (SIR) System. Failure to follow the correct procedure could cause the following conditions:

   • Air bag deployment
   • Personal injury
   • Unnecessary SIR system repairs
In order to avoid the above conditions, observe the following guidelines:
   • Refer to SIR Component Views in order to determine if you are performing service on or near the SIR components or the SIR wiring.
   • If you are performing service on or near the SIR components or the SIR wiring, disable the SIR system. Refer to Disabling the SIR System.

  1. Disable the SIR system. Refer to Disabling the SIR System .
  2. Remove the driver seat. Refer to Bucket Seat Replacement in Seats.
  3. Remove the front door stepwell mat. Refer to Front Side Door Step Mat 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) (4) from the inflatable restraint sensing and diagnostic module (SDM) harness connector (3).

    6. Object Number: 388365 Size: SH
  6. Disconnect the SDM harness connector (3) from the SDM.
  7. Remove the SDM (2) mounting fasteners (1).
  8. Remove the SDM (2) from the vehicle floor studs (5).

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

  9. Repair the fasteners using the following procedure:
    10. 9.1. Remove the stripped nut and discard the nut.
    9.2. Drill out the weld spots to the weld stud from the floor pan side, then remove and discard the stud.
    9.3. Condition the floor panel attaching surface where the new stud is to be installed.
    9.4. Install new weld stud GM P/N 115115602 and clamp the weld stud.
    9.5. Migweld the stud at the drilled holes from above or below the floor pan (as required).
    9.6. Apply body sealer GM P/N 9984248 around any exposed openings.
    9.7. Install a new fastener GM P/N 11515933.

Installation Procedure

    Object Number: 388365 Size: SH
  1. Install the SDM (2) to the vehicle floor studs (5).

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

  2. Install the SDM mounting fasteners (1).

    3. Tighten
    Tighten fasteners to 10 N·m (89 lb in).

  3. Install the SDM harness connector (3) to the SDM (2).
  4. Install the connector position assurance (CPA) (4) to the SDM harness connector (3).
  5. Position the carpet to cover the inflatable restraint sensing and diagnostic module (SDM).
  6. Install the front door stepwell mat. Refer to Front Side Door Step Mat Replacement in Interior Trim.
  7. Install the driver seat. Refer to Bucket Seat Replacement in Seats.

    8. 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.

  8. Enable the SIR system. Refer to Enabling the SIR System .