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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1685 (Theft Deterrent System) >> Description and Operation >> Vehicle Theft Deterrent (VTD) Description and Operation >> Powertrain Control Module

Powertrain Control Module

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The Powertrain Control Module (PCM) communicates with the Body Control Module (BCM) over the Class 2 serial data line. When the BCM enters tamper mode, it sends a Class 2 message to the PCM in order to disable the starting and fuel delivery systems. If the BCM receives a valid coded key, the BCM sends a class 2 message to the PCM in order to enable the starting and fuel delivery systems. The PCM then allows the vehicle to start.

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