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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1582 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC P1630: Theft Deterrent Learn Mode Active >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

This diagnostic test checks for the Enable Password Learning Flag indicating the powertrain control module (PCM) is in learn password mode. This mode allows the PCM to learn the password from the Passlock module at assembly or when being serviced. The password needs to be learned whenever the PCM or the Passlock module is replaced.

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