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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 109 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1631: Theft Deterrent System - Password Incorrect >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.

DTC indicates PCM received an incorrect password and may have set during drive cycle. If PCM detected an incorrect password during drive cycle, vehicle will still start.

If PCM detected an incorrect password from BCM during an engine crank, engine will start then stall.

Passlock(R) sensor, BCM and PCM contain the same Passlock(R) codes. If any of these components are replaced, a relearn procedure must be performed.

Attempting to start engine by substituting parts without performing PassLock(R) password learn procedure may set DTC P1631 or P1632. Diagnose any BCM PassLock(R) or communications DTCs first. Perform PassLock(R) password learn procedure using required equipment.

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