Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Self-Diagnostic System: Notes
One of two on-board diagnostic modes may be utilized. The CONDITION DETECTION MODE indicates trouble in cruise control system. The OPERATION MODE checks correct input signals to the cruise control module. Modes are performed using either the New Generation Star (NGS) tester or cruise indicator light.
Perform OPERATION MODE first. If system passes all operation modes, perform CONDITION DETECTION MODE. If condition detection mode does not output any DTCs, check components in the following order: main switch, cruise control module, cruise brake switch, brakelight switch, cruise control switch, actuator, and vehicle speed sensor. See COMPONENT TESTS . If no components are defective, repair wiring as necessary. See WIRING DIAGRAMS .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.