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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1305 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC 021 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Check for the following:

Short to ground or an open condition in the PPL/WHT wires between the instrument cluster assembly, the left instrument panel junction block, and the cruise control module.

Inspect the wiring harness and components for any of the following conditions:

Repair any electrical circuit faults that were found. Refer to WIRING REPAIRS in Wiring Systems.