w164 rear demister woes

bigpupcooper

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Your Mercedes
ML300 2010
With the current climate over here in Norn Ireland ;-) the wife reported the rear window not demisting, so today I went out to do the basic checks.

1. Light on when you push the button- Yep
2. Fuse 49 (40A) passing 12v - Yep
3. Relay clicking when I press button for demister - Yep
4. Voltage at screen - 0volts -OH OH

Now I measured the volts by touching off the element in a few places, I plan on removing the upper panel to hopefully get at the terminals, and measure off known good points. Tonight was a bit nippy.

Anyone else any thoughts?
 
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bigpupcooper

bigpupcooper

New Member
Joined
Jun 21, 2018
Messages
4
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Location
belfast
Your Mercedes
ML300 2010
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Sorted - It was the relay.

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