Preliminary Inspection

Verify customer complaint by operating cruise control system. Visually inspect for obvious sign of mechanical and electrical damage. Verify brakelights function properly. Repair as necessary. Inspect for faulty cruise control fuses, loose or corroded connections, damaged wiring harness and/or switches. Repair as necessary. Inspect for damaged or binding cruise control cable. Reroute and verify operation of cruise control cable as necessary. Inspect for incorrect cruise control cable, cruise control release switch and brakelight switch adjustments. Ensure components are properly adjusted as necessary. Inspect throttle linkage/cable for smooth operation. Unbind as necessary. Check for a broken or partially broken wire inside insulation which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Repair as necessary. Ensure any aftermarket electronic equipment is properly installed. Repair as necessary. If no problem is found, perform DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.

1. Check fuses, and replace as necessary. Visually inspect for broken or open wires.
2. Check for PCM DTCs. If any PCM DTCs exist other than P1554 or P1585, diagnose engine control system as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If DTCs P1554 or P1585 exist, go to DIAGNOSTIC TESTS  .
3. Ensure cruise control module linkage is connected and moves freely without binding. Check cruise control cable adjustment. See CRUISE CONTROL CABLE  under ADJUSTMENTS. Ensure brakelight is installed and adjusted correctly. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under ADJUSTMENTS. Ensure center high-mount brakelight switch is operating.
4. If no problems are found, go to DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.