GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Tahoe - 4WD 🢒 Restraints 🢒 SIR 🢒 Inflatable Restraint Front End Discriminating Sensor Replacement

Removal Procedure
  1. Disable the SIR system. Refer to Disabling the SIR System .
  2. Remove the engine protection shield (if equipped). Refer to Engine Protection Shield Replacement in Frame and Underbody.

    3. Object Number: 189976 Size: SH
  3. Remove the connector position assurance (CPA) from the inflatable restraint front end discriminating sensor harness connector.

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

    5. Object Number: 189984 Size: SH
  5. Remove the mounting fasteners.
  6. Remove the inflatable restraint front end discriminating sensor from the vehicle.

    7. Object Number: 189986 Size: SH

    Important: The following procedure should be utilized in the event that the sensor mounting holes or fasteners are damaged to the extent that the sensor may no longer be properly mounted.

  7. Perform the following steps in order to complete the fastener repair:
    8. 7.1. Remove and discard the improperly installed fastener.
    7.2. Chisel off the damaged weld nut.
    7.3. Condition the front end lower tie surface where the new weld nut is to be installed.
    7.4. Install the new weld nut (GM P/N 11514034) or equivalent into position.
    7.5. Migweld the new weld nut to the front end lower tie surface in the correct location.
    7.6. Use the new fastener (GM P/N 11515926) or equivalent.

Installation Procedure

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.


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


    Object Number: 189984 Size: SH
  2. Install the inflatable restraint front end discriminating sensor mounting fasteners.

    3. Tighten
    Tighten fasteners to 10 N·m (89 lb in).


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

    4. Object Number: 189976 Size: SH
  4. Install the connector position assurance (CPA) to the inflatable restraint front end discriminating sensor harness connector.
  5. Install the engine protection shield (if equipped). Refer to Engine Protection Shield Replacement in Frame and Underbody.
  6. Enable the SIR system. Refer to Enabling the SIR System .