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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 267 (Theft Deterrent System) >> Description and Operation >> Vehicle Theft Deterrent (VTD) Description and Operation >> Body Control Module

Body Control Module

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The PASS-Key® system is an internal function of the Body Control Module (BCM). The BCM reads the key code from the ignition cylinder when the ignition is turned to the ON position. If the code is correct, the BCM will send an enable message to the PCM via the class 2 serial data circuit. If the BCM receives the wrong code, the BCM will immediately go into tamper mode. The BCM will send a disable message to the PCM disabling the starting and fuel delivery systems.

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