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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 Procedures

Diagnostic Procedures

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.
NOTE: Diagnose any BCM PassLock(R) or communications DTCs first.

Perform Passlock(R) relearn procedure. See PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS  under PROGRAMMING.

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