GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 S10 Pickup - 4WD 🢒 Restraints 🢒 SIR 🢒 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
  1. Disable the SIR system. Refer to Disabling the SIR System .
  2. Remove the drivers seat. Refer to Seat Replacement in Seats.
  3. Remove driver seat belt from floor. Refer to the Seat Belt Replacement - Driver in Seat Belts.
  4. Remove the carpet retaining sill trim molding - LH. Refer to Sill Trim Plate Replacement in Interior Trim.
  5. Remove the floor console (if equipped). Refer to Front Floor Console Replacement in Instrumenet Panel, Gauges and Console.

    6. Important: Remove the left body side trim panel for extended cab pickup.

  6. Remove the LH Kick Panel.
  7. Fold back the carpet to access the inflatable restraint Sensing and Diagnostic Module (SDM).
  8. Remove the Connector Position Assurance (CPA) from the SDM harness connector.
  9. Disconnect the SDM harness connector from the SDM.

    10. Object Number: 187111 Size: SH
  10. Remove the SDM mounting fasteners (1).
  11. Remove the SDM (2) from the vehicle (3).

Installation Procedure

    Object Number: 187111 Size: SH
  1. Install the SDM (2) to the vehicle (3).
  2. Install the SDM mounting fasteners (1).

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

    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.

  3. Install the SDM harness connector to the SDM.
  4. Install the Connector Position Assurance (CPA) to the SDM harness connector.
  5. Position the carpet to cover the inflatable restraint Sensing and Diagnostic Module (SDM).

    6. Important: Install the left body side trim panel for extended cab pickup.

  6. Install the LH Kick Panel.
  7. Install the floor console (if equipped). Refer to Front Floor Console Replacement in Instrument Panel, Gauges and Console.
  8. Install the carpet retaining sill trim molding -- LH, Refer to Sill Trim Plate Replacement in Interior Trim.
  9. Install driver seat belt to floor. Refer to Seat Belt Replacement - Driver .
  10. Install the driver seat. Refer to Seat Replacement in Seats.
  11. Enable the SIR system. Refer to Enabling the SIR System .