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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1425 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC P1630: Theft Deterrent Learn Mode Active >> Circuit Description

Circuit Description

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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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