E-Class (W211) 2003-2009

Electrical gremlins

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Old Sep 15, 2022 | 01:08 PM
  #1  
reyacue's Avatar
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2001 C320/1994 E320 coupe
Electrical gremlins

2008 Mercedes E350 base model ac blower motor turns on and off by itself as car is being driven or sitting at idle also the brake light flashes on and off as this happens
the windows will go down in one push but coming up it goes up 2-3 inches stops radoi stop completely working all fuses are good has the follwing codes in it,930E,9355,9343,
9340,9342,0345,9354,9347 all these codes say CAN comunications are happening on a sinle wire(can bus high).Any help would be appricated
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Old Sep 16, 2022 | 10:55 AM
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W212 MY'14 M276-3.5NA @75kMi
ballpark...

Originally Posted by reyacue
2008 Mercedes E350 base model ac blower motor turns on and off by itself as car is being driven or sitting at idle also the brake light flashes on and off as this happens
the windows will go down in one push but coming up it goes up 2-3 inches stops radoi stop completely working all fuses are good has the follwing codes in it, 930E,9355,9343,
9340,9342,0345,9354,9347 all these codes say CAN comunications are happening on a sinle wire(can bus high).
Any help would be appricated
Good job not starting to replace random parts

How many miles currently? Check the alternator voltage is at 13.xV or better?

Pls translate your list if individual codes ...

Saying CAN is disrupted is good clue to have. This sounds like a SAM power distribution issue... let's try to get it pin pointed to find the cause.

Do you have a Voltmeter or "DVM" to poke around?

What are you looking to do next?

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Old Sep 16, 2022 | 05:03 PM
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Once you are done with @CaliBenzDriver advice, I would advice to check for moisture in both footwell, and left side inside your trunk (rear SAM is there).

Touch carpets for moisture. Water intrusion? Has the vehicle been exposed to water lately?
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Old Sep 16, 2022 | 07:58 PM
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W212 MY'14 M276-3.5NA @75kMi
soaked electricals....

Gremlins thrive like mosquitoes in water...

You want to find out :
  • what circuits are impacted and
  • where the main issue is taking place
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Old Sep 19, 2022 | 12:44 PM
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Also, since the fan motor will stop by itself, also remove the cabin filter and see if any water got in there. The filter is under a cover on the right rear of the engine compartment and the AC blower is just below it.

Good luck,
Peter
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