GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Seville - RHD 🢒 Restraints 🢒 Seat Belts 🢒 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.

Caution: If any water enters the vehicle's interior up to the level of the carpet or higher and soaks the carpet, the sensing and diagnostic module (SDM) and the SDM harness connector may need to be replaced. The SDM could be activated when powered, which could cause deployment of the air bag(s) and result in personal injury. Before attempting these procedures, the SIR system must be disabled. Refer to Disabling the SIR System.

With the ignition OFF, inspect the SDM mounting area, including the carpet. If any significant soaking or evidence of significant soaking is detected, you must perform the following tasks:

  1. Remove all water.
  2. Repair the water damage.
  3. Replace the SDM harness connector.
  4. Replace the SDM.
Failure to follow these tasks could result in possible air bag deployment, personal injury, or otherwise unneeded SIR system repairs.

Removal Procedure

    Object Number: 291625 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 Front Floor Panel Carpet Replacement in Interior Trim.
  4. Lift up the carpet and insulation in order to access the inflatable restraint sensing and the diagnostic module (SDM).

    5. Object Number: 142175 Size: SH
  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 (2).

Installation Procedure

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

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

  2. Install the SDM mounting fasteners (1).

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

  3. Install the Connector Position Assurance (CPA) (1) to the inflatable restraint sensing and diagnostic module (SDM) wiring harness connector (2).

    4. Object Number: 142175 Size: SH
  4. Install the SDM harness connector (2) to the SDM (1).
  5. Install the Connector Position Assurance (CPA) (3) to the SDM harness connector (2).

    6. Object Number: 291625 Size: SH
  6. Install the passenger carpet retainer. Refer to Front Floor Panel Carpet Replacement in Interior Trim.
  7. Install the passenger seat. Refer to Front Seat Replacement - Bucket in Seats.
  8. Enable the SIR system. Refer to Enabling the SIR System .

    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. Program the SDM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control Systems.