ninaschwarz1
Mercedes ML Headlight and Windshield Washer Failure
Summary of the thread
A 2001 Mercedes ML experienced simultaneous failures in its headlight cleaning and windshield washer systems, despite adequate fluid levels. The initial suspicion was a potential issue with cable connections or relays. Suggestions included checking for shared electrical components, such as fuses, relays, or corroded connectors. Ultimately, the problem was traced to a corroded connector, which was repaired at a workshop.
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4 comment(s)
ninaschwarz1 (community.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 (community.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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MERCEDES
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ML
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.