Caution: Do not strike or jolt the inflatable restraint sensing and diagnostic module (SDM). Before applying power to the SDM, make sure that it is securely fastened with the arrow facing toward the front of the vehicle. Failure to observe the correct installation procedure could cause SIR deployment, personal injury, or unnecessary SIR system repairs.

1. Disable the SIR system. Refer to SIR Disabling and Enabling .
2. Remove the passenger front seat. Refer to Seat Replacement in Seats.
3. Remove the passenger front carpet retainer, then roll back the carpet. Refer to Carpet Retainer Replacement in Interior Trim.
4. Remove the connector position assurance (CPA) from the inflatable restraint sensing and diagnostic module (SDM) wiring harness connector.



5. Disconnect the SDM wiring harness connector from the SDM.



6. Remove the SDM mounting fasteners (2).
7. Remove the SDM (1) from the floor pan (3).

1. Remove any dirt, grease, or other impurities from the mounting surface.



2. Install the SDM (1) horizontally to the floor pan (3).
3. Point the arrow on the SDM toward the front of the vehicle.

Notice: Refer to Fastener Notice in the Preface section.

Important: If the old mounting fasteners are damaged, refer to the additional repair procedures at the end of this step.

4. Install the SDM mounting fasteners (2).

Tighten
Tighten the fasteners to 14 N·m (124 lb in).

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

First Repair

4.1.	Discard the old fastener.

4.2.	Use a new fastener GM P/N 10156138.

4.3.	Install the SDM mounting fasteners (1).

Tighten
Tighten the fasteners to 14 N·m (124 lb in).

Second Repair

4.1.	Discard the old fastener.

4.2.	Use a larger fastener GM P/N 10267482 with washer GM P/N 11500305.

4.3.	Install the SDM mounting fasteners (1).

Tighten
Tighten the fasteners to 15 N·m (11 lb ft).




1. Install the SDM wiring harness connector to the SDM.



2. Install the CPA to the SDM wiring harness connector.
3. Install the carpet and the passenger front carpet retainer. Refer to Carpet Retainer Replacement in Interior Trim.
4. Install the passenger front seat. Refer to Seat Replacement in Seats.
5. Enable the SIR system. Refer to SIR Disabling and Enabling .
6. If you replaced the SDM, perform the following procedure in order to update the BCM with the new SDM part number:

Important: The AIR BAG indicator may remain ON after the SDM is replaced. After programming the SDM part number into the BCM, cycle the ignition switch OFF and ON. This turns OFF the AIR BAG indicator and clears the DTC.

10.1.

Install a scan tool.

10.2.

Select the Special Functions option from the SIR Menu and press enter.

10.3.

Select the Setup SDM Part Number in BCM option and press enter.

10.4.

Follow the procedure on the scan tool display.

10.5.

Cycle the ignition switch OFF and ON.