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Home >> GMC >> 2003 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Supplemental Inflatable Restraint System) >> Repair Instructions >> Inflatable Restraint Sensing and Diagnostic Module Replacement >> Removal Procedure
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Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    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 Caution in Cautions and Notices.
  1. Disable the SIR system. Refer to SIR Disabling and Enabling Zone 7 .
  2. Remove the drivers seat. Refer to Seat Replacement - Front Bucket in Seats.
  3. Remove the driver side door sill plate. Refer to Door Sill Plate Replacement - Front in Interior Trim.
    4. Fig 1: Passenger Seat
    GM291625Courtesy of GENERAL MOTORS CORP.
  4. Fold back the carpet to access the inflatable restraint sensing and diagnostic module (SDM).
    5. Fig 2: View Of Connector Position Assurance (CPA) Flex Lock Button
    GM466123Courtesy of GENERAL MOTORS CORP.
  5. Remove the connector position assurance (CPA) (1) from the inflatable restraint sensing and diagnostic module (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. Fig 3: SDM
    GM388339Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the SDM wiring harness connector (1) from the SDM (3).
  8. Remove the SDM mounting fasteners.
  9. Remove the SDM from the vehicle.
    10. 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.
  10. Repair the fasteners using the following procedure:
    1. Remove the stripped nut and discard the nut.
    2. Drill out the weld spots to the weld stud from the floor pan side, then remove and discard the 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.
    5. Migweld the stud at the drilled holes from above or below the floor pan, as required.
    6. Apply body sealer GM P/N 9984248 around any exposed openings.
    7. Install a new fastener GM P/N 11515933.
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