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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1635 (Body Control System) >> Diagnostic Information and Procedures >> DTC B1001: ID/VIN Data Mismatch >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

After enter RUN mode, the inflatable restraint sensing and diagnostic module (SDM) and Radio receive the VIN from BCM, via class 2 serial data circuit. SDM also receives a message from BCM containing its restraints ID. The restraints ID contains the last four digits of the SDM part number. The modules compare the information stored in their memory with the information received from the BCM.

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