M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Headlamp washers - fuse/relay location

Old Apr 21, 2026 | 12:01 PM
  #1  
stripey's Avatar
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From: Mansfield, UK
ML 350, W164, 2015
Headlamp washers - fuse/relay location

Hiya

I have the 2010 ML350, W164 and have an issue where both headlamp washers are not functioning. Obvious start point has to be the fuse but I can't find it listed anywhere. Can anyone tell me which fuse and/or relay relates to the headlamp washer please?
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Old Apr 22, 2026 | 03:33 AM
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stripey's Avatar
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ML 350, W164, 2015
you can ignore this folks. W164 it's not a separate fuse/relay which means it looks like (hopefully) the motor
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Old Apr 22, 2026 | 10:33 PM
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Originally Posted by stripey;[url=tel:9283425
9283425[/url]]you can ignore this folks. W164 it's not a separate fuse/relay which means it looks like (hopefully) the motor
I went through something similar with the washer pump in my ML63. Pump motor was dead. But the headlight washer system had a completely separate pump if memory serves. The other pump does the main and rear glass washers.
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Old Apr 24, 2026 | 07:39 AM
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Thanks - I did end up finding that out and pump is on order
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Old Apr 24, 2026 | 11:15 AM
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Originally Posted by stripey;[url=tel:9284063
9284063[/url]]Thanks - I did end up finding that out and pump is on order
Heres the link to me doing that repair in case it’s of any help:
https://mbworld.org/forums/ml55-amg-...ml#post8915037
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Old Apr 27, 2026 | 05:53 AM
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ML 350, W164, 2015
Originally Posted by Joshinator99
Heres the link to me doing that repair in case it’s of any help:
https://mbworld.org/forums/ml55-amg-...ml#post8915037

Thanks - I'll be doing it this afternoon and the picture helps
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Old May 5, 2026 | 06:52 AM
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stripey's Avatar
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From: Mansfield, UK
ML 350, W164, 2015
Originally Posted by Joshinator99
Heres the link to me doing that repair in case it’s of any help:
https://mbworld.org/forums/ml55-amg-...ml#post8915037
Turned out not to be the pump - it activates as it should do and works fine. (Not sure why I couldn't hear it running - but I am getting old, so maybe that's why)

so next job is to trace the pipework to see where the self-return valve is and unblock/change it.
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