GM Service Manual Online
For 1990-2009 cars only

Caution: Be careful when you handle a sensor. Do not strike or jolt a sensor. Before applying power to a sensor:

   • Remove any dirt, grease, etc. from the mounting surface.
   • Position the sensor horizontally on the mounting surface.
   • Point the arrow on the sensor toward the front of the vehicle.
   • Tighten all of the sensor fasteners and sensor 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

  1. Disable the SIR system. Refer to Disabling the SIR System .
  2. Remove the Off Road Skid Plate (if equipped).

  3. Object Number: 189976  Size: SH
  4. Remove the Connector Position Assurance (CPA) from the inflatable restraint front end discriminating sensor harness connector.

  5. Object Number: 189982  Size: SH
  6. Disconnect the inflatable restraint front end discriminating sensor harness connector from the sensor.

  7. Object Number: 189984  Size: SH
  8. Remove the mounting fasteners.

  9. Object Number: 189986  Size: SH
  10. Remove the inflatable restraint front end discriminating sensor from the vehicle.
  11. Important: The following procedures should be utilized in the event that sensor mounting holes or fasteners are damaged to the extent that the sensor can no longer be properly mounted.

Fastener Repair

  1. Remove and discard the fastener.
  2. Chisel off the damaged weld nut.
  3. Condition the front end lower tie surface where the new weld nut is to be installed.
  4. Install the new weld nut (part # 11514034) or equivalent into position.
  5. Migweld the new weld nut to the front end lower tie surface in the correct location.
  6. Use the new fastener (part # 11515926) or equivalent.

Installation Procedure


    Object Number: 189986  Size: SH
  1. Install the inflatable restraint front end discriminating sensor to the front end lower tie surface make sure the arrow is pointing toward the front of the vehicle.

  2. Object Number: 189984  Size: SH

    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 inflatable restraint front end discriminating sensor mounting fasteners.
  4. Tighten
    Tighten fasteners to 8 N·m (71 lb in).


    Object Number: 189982  Size: SH
  5. Connect the inflatable restraint front end discriminating sensor harness connector to the sensor.

  6. Object Number: 189976  Size: SH
  7. Install the Connector Position Assurance (CPA) to the inflatable restraint front end discriminating sensor harness connector.
  8. Enable the SIR system. Refer to Enabling the SIR System .