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.
Checking The Rain Sensor
HINT: If the car has been in programming mode, or if the voltage has been switched off, the car must be locked and then unlocked again. This is to ensure that the rain sensor functions correctly.
Check the cable between terminal #4 on the control module and the park position switch. Check for an open-circuit and a short-circuit.
When the wiper is activated the park position switch should be grounded, 0 V. Otherwise it should be 12 V.
Remedy as necessary.
Other information
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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.