Hi, I have problem with my W203 C180 Today SRS warning light show up and also wipers either horn dont working (windscreen washers work fine but still didnt run wipers) Had it readed with OBD and This code shows up : B1002 (Restraint system control module) Circuit 15R No voltage when voltage present at circuit 15 Do you know guys what should I looking for ? Could steering ring under steering wheel caused even wipers not working ?
Thanks in advance for your answers
Sorry, my english is not too good.

 

Hi there, I know it's an old thread, I have the exact same error/problem. Did you igure out why there were no voltage at circuit 15?
Thanks!!

 

All these parts go through the steering column module, but Mercedes changed the wire connections
This is the later cable plan (German)

 

Thank you very much.
I found the M relay in the front Sam in charge of the 15R circuit to be not working, it doesn't click or transmit current. I'll be changing it tomorrow and see if it solves the problem. Still no clue why it burned in the first place, car has only 55k original miles on it

 

Hi I have already solved this issue, in my case it was cold joint on SAM's circuit board.

 

Great to know! Might check there next time to see how I came to blow such a huge relay (I think it's a 70A relay). Something might have shorted in the first place

 

You got styled with really good diagnostic info, Nice!

 

Absolutely! Much appreciated!