SRS light on when cold; off when warm
Thread Starter
Senior Member
Joined: Nov 2007
Posts: 419
Likes: 16
From: NY
2014 E550; 2003 E500
SRS light on when cold; off when warm
Every morning when it's below 35 degrees, I start my car and i get the SRS malfunction light and message. I drive like that to work and then when I leave work, I start it up and its on again but the error goes away after a minute.
What would cause this to occur? Bad battery? I'm thinking it has to do with the outside temperature and the battery losing power when it's at freezing.
What would cause this to occur? Bad battery? I'm thinking it has to do with the outside temperature and the battery losing power when it's at freezing.
Thread Starter
Senior Member
Joined: Nov 2007
Posts: 419
Likes: 16
From: NY
2014 E550; 2003 E500
About a week after this started to happen, the SRS just stayed on without going away. The a week after that i smelled a burning wire/plastic odor and then my steering wheel button light started going on and off - it was night and the illuminations were flickering; the buttons didnt work when the illumination was off. Then the buttons stopped workingthe next day. Now i have the SRS light, no horn, and no steering wheel buttons. In addition to the SRS, the "passenger airbag off" light/indicator in the center console is on too.
I havent checked it out because i've been too busy, but i got a heads up that it could be either the steering wheel module or the wire harness to the steering wheel. Other than looking to see if the harness wiring is burned, i dont know how to check if it's damaged. PM me your emails and i can send you the email i received.
I want to add that my heated steering wheel switch doesnt work either. Only the turn signal switch is working (turning signals and wipers).
I havent checked it out because i've been too busy, but i got a heads up that it could be either the steering wheel module or the wire harness to the steering wheel. Other than looking to see if the harness wiring is burned, i dont know how to check if it's damaged. PM me your emails and i can send you the email i received.
I want to add that my heated steering wheel switch doesnt work either. Only the turn signal switch is working (turning signals and wipers).
Last edited by MercFiveHundred; Jan 20, 2011 at 09:47 PM.
Thread Starter
Senior Member
Joined: Nov 2007
Posts: 419
Likes: 16
From: NY
2014 E550; 2003 E500
I heard that these SRS lights are diffcult to diagnose, but SDS would tell you the location of the error. I replaced my turn signal switch and i got the SRS light after i replaced it. My heated steering wheel didnt work either. Bought it to the dealer and told me SDS said it was in the steering column or airbag. I replaced the turn signal switch again 6months later on a hunch and that ended up being the problem. Heated steering wheel switch worked and i got the SRS light reset by SDS. Only problem is, the turn signal switch is the only thing now working on my steering wheel!!!!! LOL
