W202 Electrical Fault

[PaddyEnglish86]

Indicators have stopped working although the hazards work, windows don't open, boot open button doesn't work and central locking doesn't work. All of this has happened simultaneously. I have visually checked all of the fuses but not with a meter. Any ideas what this could be?

Thanks

 

[Dec]

Test the alarm, what year is the car?
See… http://www.mbclub.co.uk/forums/electronics/169666-w202-how-test-car-alarm.html

Dec

 

[martyz]

Happened to me out of the blue,pulled over scratched my head,tried hazards,they
worked,tried windows indicators and wipers,all worked again,not happened since.

 

[martyz]

Test the alarm, what year is the car?
See… http://www.mbclub.co.uk/forums/electronics/169666-w202-how-test-car-alarm.html

Dec

Out of curiosity,how is this condition tied into the alarm?

 

[Dec]

Its just an opinion, if the alarm is the original factory fitted unit then, at 15 years old, its very likely to be faulty, the alarm system is tied into indicator/hazards and central locking, it knows if the boot is open or shut, it knows if the key is in the ignition etc so if its not working properly then it should be disconnected, just to see if that will make any difference to the fault.

Dec

 

[PaddyEnglish86]

Also, I forgot to mention the horn isn't working

 

[PaddyEnglish86]

Also the mirrors and wipers have stopped working.

I have found this:

N10 Relay, Soldering Repair, Wiper - Indicators & Hazards - Rear Window Demister. - Mercedes-Benz Owners' Forums

I will be trying this. I will let you know if it's a success. If not hopefully it will help someone else.

 

[martyz]

Won't explain windows/horn/locking though.

 

[Dec]

Test the alarm, what year is the car?
See… http://www.mbclub.co.uk/forums/electronics/169666-w202-how-test-car-alarm.html

Dec

If your car is s facelift then you don’t have an N10 Relay, I take it your alarm is not working, is that right or is that not right?

I may be the front SAM, it looks like in the yoke in the below link,you could examine yours to see if there is any sign of wet/corrosion damage.
98 99 + W202 W210 SAM Module Computer 0195455632 E320 E430 C230 Kompressor C280 | eBay

Dec

 

[Capt Chaos]

Might be a bit late with this, as tread is a bit old now, but

I had all these problems on my C250TD
Unplugged the factory alarm
and window, locking etc, sorted
Replaced SAM unit with second hand one from Ebay
(Make sure you match your SAM part Number)
Sorted horn ,indicator and wiper problem.

Hope it helps