it all started with wrong battery terminal removal **long story** (positive before negative)
ever since that moment i have been having issues with my complete electrical system. the engine starts normal but then instrument cluster does not change and the radiator fan works at really high speed making a loud noise.

things that dont work.

1. Windows
2. Horn
3. Windshield wiper, signal indicator.....
4. the AC Dont work
5. almost everything electrical...except hazards and inner lights

I went to an independent Mercedes specialist and i was told there scanner couldn't communicate with my car and i was charged $210 for the 3 days of no result my car spent with them. Am scared of going to Mercedes dealer because $$$. I read some forums and some said maybe my rear SAM unit has blown out, I searched on eBay and found a used rear SAM unit for $125 bought it and it will deliver by Tuesday and i have my fingers crossed . PLEASE GUYS its my first time posting on here and i really don't know much about Mercedes. any ideas as to whats causing the problem and what i need to do.

 

Post this in the W203 forum. This one is for 2012+ C-Class Coupes