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.
Circuit/System Verification
- Ignition ON.
- Verify the park assist system is enabled through the parking assist switch.
- If the park assist system is manually disabled, enable the system.
Refer to the vehicle owners manual for instructions on enabling the system.
- If the park assist system does not manually change
- If the park assist system is manually disabled, enable the system.
- Verify the scan tool Park Assist Switch parameter while pressing and releasing the parking assist switch. The parameter should change between Active and Inactive.
- If the parameter does not change between Active and Inactive
Refer to Parking Assist Switch Circuit Malfunction .
- If the parameter changes between Active and Inactive
- If the parameter does not change between Active and Inactive
- Command the Park Assist Switch LED output control On and Off with the scan tool. The parking assist switch indicator should turn On and Off when changing between the commanded states.
- If the indicator does not turn ON and OFF
Refer to Parking Assist Switch Indicator Circuit Malfunction .
- If the indicator does turn ON and OFF
- If the indicator does not turn ON and OFF
- Transmission in reverse, verify the Engine Control Module (ECM) scan tool Reverse Position Switch parameter is Active.
- If the parameter is not Active
Refer to Backup Lamps Malfunction (Automatic Transmission) , Backup Lamps Malfunction (Manual Transmission) .
- If the parameter is Active
- If the parameter is not Active
- Transmission in REVERSE, verify the scan tool Park Assist System Status parameter displays Enable.
- If the parameter is not Enabled
Refer to Diagnostic Aids to determine the cause of the inhibit.
- If the parameter is Enabled
- If the parameter is not Enabled
- All OK.
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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.