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. Disconnect the electrical connectors from the MAF and the IAT sensors.
3. Loosen the clamp.
4. Remove the air tube from the throttle body air intake cover.
5. Remove the air box assembly with the MAF sensor from the upper radiator shroud.
6. Remove the bolts.
7. Remove the upper radiator shroud. Refer to Fan Shroud Replacement in Engine Cooling.
8. Remove the fan and clutch assembly.
9. Unsnap and remove the lower radiator shroud.
10. Disconnect the electrical connector from the SIR sensor (3) at the top of the cradle (1).
11. Remove the bolts (2).
12. Remove the SIR sensor (3) from the cradle.

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.

1. Remove and discard the improperly installed rivet.
2. Reattach sensor with new rivet (GM P/N 15715058) or equivalent.

1. Remove the improperly installed rivet.
2. Enlarge the mounting holes in the lower radiator support to 9.0 mm (0.35 in).
3. Insert and properly seat rivnut (GM P/N 15699834) or equivalent.

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.

4. Install sensor with screw (GM P/N 11515664) or equivalent.

Tighten
Tighten fasteners to 8.0 N·m(71 lb in).

1. Install the inflatable restraint front end discriminating sensor (3) to the top of the cradle.

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 (2).

Tighten
Tighten fastener to 6.5 N·m (58 lb in).

3. Connect the electrical connector to the SIR sensor.
4. Install the lower radiator shroud.
5. Install the the fan and clutch assembly.
6. Install the upper radiator shroud.
7. Install the air box with MAF sensor to the upper radiator shroud.
8. Connect the air tube to the throttle body air intake cover with the clamp.
9. Connect the electrical connectors to MAF and IAT sensors.
10. Enable the SIR system. Refer to Enabling the SIR System .