Perform the Diagnostic System Check - SIR prior to using this diagnostic procedure.

When the ignition switch is turned ON, the sensing and diagnostic module (SDM) compares the restraints ID that is stored in itself to the restraints ID that is stored in the body control module (BCM). The restraints ID that is being compared contains the last four digits of the SDM part number. The SDM then compares the VIN stored in itself to the VIN stored in the BCM.

Ignition ON.

The restraints ID or VIN information stored in the SDM does not match that which is stored in the BCM.

A current DTC will clear when the SDM and BCM data matches

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. Ignition ON, verify that DTC B1001 is not set.

⇒	If the DTC is set, reprogram the BCM with the proper vehicle option content. If the DTC resets, replace the BCM.

2. Replace the SDM.