lealion28
Mercedes SL Airbag Warning Rollover Sensor Issue
Summary of the thread
The 2010 Mercedes SL has an airbag warning light due to a rollover sensor malfunction, suspected to be caused by a defective control unit. A similar issue in a BMW was resolved by replacing the control unit after confirming the problem through diagnostics. The solution for the Mercedes was also to replace the faulty control unit, which successfully resolved the issue.
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4 comment(s)
lealion28 (community.author)
The connector appears clean. Is the BMW's sensor similar in terms of potential failure modes? What specific tests did you perform?
KatMueller
Yes, BMW's setup is similar. In my case, the diagnostic pointed directly at the sensor, and the symptoms were identical to yours. I even tried clearing the codes, but they returned immediately. My local workshop also suggested the control unit was the issue, which, for me, was the right call. A replacement was required.
lealion28 (community.author)
Confirmed. Replacing the faulty control unit resolved the issue. Thanks for confirming the likely cause. I appreciate the input.
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MERCEDES
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SL
KatMueller
I had a similar vehicle safety problem with my older BMW. The tilt sensor threw codes and lit up the dash. Have you checked the wiring harness and connector to the sensor? Sometimes corrosion or a loose connection can cause false readings before condemning the sensor itself.