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 scan tool Rear Closure Ajar Switch parameter changes between Inactive and Active when opening and closing the liftgate.
- If the parameter does not change
Refer to Door Ajar Indicator Malfunction
- Go to next step: If the parameter changes
- If the parameter does not change
- Verify the Scan Tool Rear Wiper Switch Parameter changes between ON and OFF when cycling the rear wiper switch ON and OFF.
- If the parameter does not change
Refer to Circuit/System Testing - Rear Wiper/Washer Switch Malfunction
- Go to next step: If the parameter changes
- If the parameter does not change
- Verify the M45 Rear Wiper Motor cycles when commanding the rear wiper ON with the rear wiper switch
- If the M45 Rear Wiper Motor does not cycle
Refer to Refer to Circuit/System Testing - Rear Wiper Motor Malfunction
- Go to next step: If the M45 Rear Wiper Motor cycles
- If the M45 Rear Wiper Motor does not cycle
- Verify the M45 Rear Wiper Motor returns to the park position when the rear wipers are turned OFF
- If the M45 Rear Wiper Motor does not return to the park position
Refer to Circuit/System Testing - Rear Wiper Motor Malfunction
- Go to next step: If the M45 Rear Wiper Motor returns to the park position
- If the M45 Rear Wiper Motor does not return to the park position
- All OK.
NO RELATED
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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.