SRS light and no wipers or horn

Jul 2, 2022 | 04:37 AM

Borec

Thread Starter

Newbie

Joined: Jul 2022

Posts: 2

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C-Class W203 C180

SRS light and no wipers or horn

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.

Oct 18, 2024 | 05:29 PM

michobebe

Junior Member

Joined: May 2009

Posts: 70

Likes: 3

W220 S500 2003 4Matic & W140 1998 S600 V12

Quote:

Originally Posted by Borec

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!!

Oct 18, 2024 | 05:45 PM

112233

Senior Member

Joined: Apr 2009

Posts: 317

Likes: 49

w203cl

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

Attached Files

Elektrischer Schaltplan Steuergerät Mantelrohrmodul.pdf (117.0 KB, 220 views)

Oct 18, 2024 | 07:24 PM

michobebe

Junior Member

Joined: May 2009

Posts: 70

Likes: 3

W220 S500 2003 4Matic & W140 1998 S600 V12

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

Oct 19, 2024 | 01:06 PM

Borec

Thread Starter

Newbie

Joined: Jul 2022

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C-Class W203 C180

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

Oct 19, 2024 | 05:01 PM

michobebe

Junior Member

Joined: May 2009

Posts: 70

Likes: 3

W220 S500 2003 4Matic & W140 1998 S600 V12

Quote:

Originally Posted by Borec

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