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

1. Disable the SIR system. Refer to Disabling the SIR System .
2. Raise the vehicle and support. Refer to Lifting and Jacking the Vehicle in General Information.
3. Remove the connector position assurance (CPA) from the inflatable restraint front end discriminating sensor harness connector.
4. Disconnect the inflatable restraint front end discriminating sensor harness connector from the sensor.
5. Remove the inflatable restraint front end discriminating sensor mounting fasteners (4).
6. Remove the inflatable restraint front end discriminating sensor (3) from the front end lower tie bar (1).

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.

Important: Utilize the first fastener repair and the second fastener repair in the event that the sensor mounting holes or fasteners are damaged to the extent that the sensor can no longer be properly mounted.

7. Perform the following steps in order to complete the first fastener repair:

7.1.	Remove the stripped fastener and discard the nut.

7.2.	Chisel off the damaged weld nut and discard the weld nut.

7.3.	Condition the front end lower tie bar surface where the new weld nut is to be installed.

7.4.	Install new weld nut GM P/N 11514034 into position.

7.5.	Migweld the new weld nut to the front end lower tie bar surface in the correct location.

7.6.	Install sensor with new fastener GM P/N 11515926.

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

8. Perform the following steps in order to complete the second fastener repair:

8.1.	Remove the improperly installed rivet.

8.2.	Enlarge the mounting holes in the lower radiator support to 9.0 mm (0.35 in).

8.3.	Insert and properly seat the rivnut.

8.4.	Install the sensor with the screw.

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

1. Install the inflatable restraint front end discriminating sensor (3) to the front end lower tie bar (1).

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 inflatable restraint front end discriminating sensor mounting fasteners (4).

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

3. Connect the inflatable restraint front end discriminating sensor harness connector to the sensor.
4. Install the connector position assurance (CPA) to the inflatable restraint front end discriminating sensor harness connector.
5. Remove the safety stands and lower the vehicle.
6. Enable the SIR system. Refer to Enabling the SIR System .