V50 Electrics : - V50 electrics gone crazy

Volvo v5 · Oct 7th, 2020, 08:46

Hi, i am new here and i want you to tell me what might cause that malfunction.
Volvo V50 04' with 195k km.
The car was running fine until one day that while driving (on dry road/day) the wipers started going crazy while being in off position and after a while i got a brake failure message while the brakes where working perfectly fine. I manage to return back home but now it doesnt start up (i guess cause of the brake failure safty system). Also the wipers dont work any more.
I hope it isnt the computer module that is going bad.
Any ideas?

FunkyMelon · Oct 7th, 2020, 09:41

Disconnect your battery and unplug your CEM. Give all the contacts on the CEM and wiring harness a good clean with a toothbrush and contact cleaner, then put it all back together.

I had the same issue and this fixed it, it's been fine for over a year now.

MDS40 · Oct 8th, 2020, 08:47

+ 1 For the above.

Volvo v5 · Oct 9th, 2020, 19:16

I took out the CEM, indeed there was a serious amount of corrosion (2 pins had huge holes) and i cleaned it very carefully with a brush and a contact cleaner. Then it was left to dry completely for about 2 hours , i placed it back , connect the battery and then after switching the key to on position everything worked fine for some seconds (wipers, no error messages). I tried to start the car and everything went black. No lights in the dashboard at all and the only electronic part that was working was the interior lights. Probably your assumptions were correct, but the CEM was in a really bad condition

(Pics of before and after, the corrosion is at the top right but you cant see it from the pics)
Thank you for your answers.

Oct 7th, 2020, 08:46	#1
Volvo v5 New Member Last Online: Dec 5th, 2020 00:33 Join Date: Oct 2020 Location: ΑΜΑΡΟΥΣΙΟΥ	V50 electrics gone crazy Hi, i am new here and i want you to tell me what might cause that malfunction. Volvo V50 04' with 195k km. The car was running fine until one day that while driving (on dry road/day) the wipers started going crazy while being in off position and after a while i got a brake failure message while the brakes where working perfectly fine. I manage to return back home but now it doesnt start up (i guess cause of the brake failure safty system). Also the wipers dont work any more. I hope it isnt the computer module that is going bad. Any ideas?

Oct 7th, 2020, 09:41	#2
FunkyMelon Master Member Last Online: Mar 14th, 2024 16:24 Join Date: Apr 2017 Location: South	Disconnect your battery and unplug your CEM. Give all the contacts on the CEM and wiring harness a good clean with a toothbrush and contact cleaner, then put it all back together. I had the same issue and this fixed it, it's been fine for over a year now. __________________ 2006 Volvo S40 T5 SE Sport

Oct 8th, 2020, 08:47	#3
MDS40 Senior Member Last Online: Apr 1st, 2024 17:55 Join Date: Sep 2017 Location: Berkshire	+ 1 For the above. __________________ 2006 S40 2.4 SE Auto. Ruby Red. 83K Miles Some previous cars include: Jaguar x type: Mazda 6 : Mazda 626: Ford Sierra 2.0: Toyota Celica ST 1600 : Hillman Avenger: Triumph Spitfire: Oh and a Volvo 340 GL 1984 company car from new.

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