GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Seville 🢒 Body and Accessories 🢒 Wiring Systems 🢒 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

    Object Number: 142175 Size: SH
  1. Disable the SIR system. Refer to Disabling the SIR System .
  2. Remove the passenger seat. Refer to Front Seat Replacement - Bucket in Seats.
  3. Remove the passenger carpet retainer. Refer to Carpet Retainer Replacement in Interior Trim.
  4. Lift up the carpet and insulation to access the inflatable restraint sensing and diagnostic module (SDM).
  5. Remove the Connector Position Assurance (CPA) (3) from the SDM harness connector (2).
  6. Disconnect the SDM harness connector (2) from the SDM (1).

    7. Object Number: 142173 Size: SH
  7. Remove the SDM (6) mounting fasteners (1).
  8. Remove the SDM (6) from the floor sheetmetal (2).

Installation Procedure

    Object Number: 142173 Size: SH
  1. Install the SDM (6) to the floor sheetmetal (2).

    2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Install the SDM mounting fasteners (1).

    3. Tighten
    Tighten fasteners to 9 N·m (80 lb in).


    Object Number: 142175 Size: SH
  3. Install the SDM harness connector (2) to the SDM (1).

    4. Object Number: 142175 Size: SH
  4. Install the Connector Position Assurance (CPA) (3) to the SDM harness (2) connector.
  5. Install the passenger carpet retainer. Refer to Carpet Retainer Replacement in Interior Trim.
  6. Install the passenger seat. Refer to Front Seat Replacement - Bucket in Seats.
  7. Enable the SIR system. Refer to Enabling the SIR System .