ninaschwarz1
Mercedes ML Headlight and Windshield Washer Failure
4 comment(s)
ninaschwarz1 (Author)
I checked the fuses and they seemed fine. Is there a single relay controlling both pumps, or are they separate? Where is it located? I'm thinking about using a multimeter.
adrianraven7
There might be a dedicated relay for the headlight washers, and the windshield washer pump runs off something else. Since both stopped at the same time, a shared power source or ground is still my main suspicion. Without the wiring diagrams for your ML, pinpointing the relay location is difficult. A workshop visit might be needed.
ninaschwarz1 (Author)
It was a corroded connector. I took it to a workshop, and they traced it back to a faulty connection and repaired it. Cost me 165€.
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adrianraven7
Sounds like a potential electrical issue. The headlight and windshield washer pumps often share a common ground or power supply. Have you checked the fuses? A faulty relay could definitely cause both systems to fail. Could also be a corroded connector.