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.
1. Disable the SIR system. Refer to Disabling the SIR System .
2. Remove the passenger front seat. Refer to Bucket Seat Replacement in Seats.
3. Remove the passenger front carpet retainer, then roll back the carpet. Refer to Front Side Door Sill Plate Replacement in Interior Trim.



4. Push the locking tab and release the connector position assurance (CPA) from the wiring harness connector (2) on the inflatable restraint sensing and diagnostic module (SDM).



5. Disconnect the SDM wiring harness connector (3) from the SDM (1).



6. Remove the SDM mounting fasteners (1).
7. Remove the SDM (2) from the vehicle.

Important: The following repair procedures should only be used in the event that the inflatable restraint sensing and diagnostic module (SDM) mounting studs or fasteners are damaged to the extent that the SDM can no longer be properly mounted.

First Repair

1. Remove and discard the fastener.

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 SDM mounting fasteners (1) GM P/N 10156138.

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

Second Repair

1. Remove and discard the fastener.
2. Install the SDM mounting fasteners (1) GM P/N 10267482 with washer GM P/N 11500305.

Tighten
Tighten fasteners to 15 N·m (134 lb in).

1. Install the SDM (2) to the vehicle.

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 SDM mounting fasteners (1).

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




3. Install the SDM wiring harness connector (3) to the SDM (1).



4. Install the CPA to the SDM wiring harness connector.
5. Position the carpet to cover the SDM then install the carpet retainer. Refer to Front Side Door Sill Plate Replacement in Interior Trim.
6. Install the passenger front seat. Refer to Bucket Seat Replacement in Seats.

Important: The AIR BAG indicator may remain ON after the SDM has been replaced. DTC B1001 may set requiring the SDM part number to be set in multiple modules. If the indicator remains ON after enabling the SIR system, perform the diagnostic system check and follow the steps thoroughly to ensure that the SDM is set properly.

7. Enable the SIR system. Refer to Enabling the SIR System .