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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 P1631: Theft Deterrent Start Enable Signal Not Correct >> Test Description

Test 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.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. This DTC may set as a result of other Passlock System problems. Diagnose any BCM DTCs prior to continuing with this diagnostic.
  2. 3. A DTC B3031 may set in the body control module (BCM) during the Password Learn Procedure.
Fig 1: DTC P1631 - Diagnostic Chart
G01641030Courtesy of GENERAL MOTORS CORP.
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