SRS Warning
RESTR. SYS. DEFECT!
SRS
VISIT WORKSHOP!
I can clear it out with the R button, but the SRS light stays on.
I pulled over, turned the car off, turned it back on, 10 seconds later the same message comes on.
Any clue to what this could mean and if it's seriouse?
RESTR. SYS. DEFECT!
SRS
VISIT WORKSHOP!
I can clear it out with the R button, but the SRS light stays on.
I pulled over, turned the car off, turned it back on, 10 seconds later the same message comes on.
Any clue to what this could mean and if it's seriouse?

Probably the seatbelt sensor.. Usually airbag problems with w220 is clockspring in steering wheel..
By any chance did you get your car cleaned up recently.. Wet carpet (from a carpet cleaner) will sometimes kill the seatbelt latch sensor or render it disabled until it dries.
Either case, your under warranty right?? Just take it in to the dealer.
Good luck.
By any chance did you get your car cleaned up recently.. Wet carpet (from a carpet cleaner) will sometimes kill the seatbelt latch sensor or render it disabled until it dries.
Either case, your under warranty right?? Just take it in to the dealer.
Good luck.
I turned the car on this morning, drove to work for about 30 minutes and no warnings. I remember reading some where that proximity cards may screw up teh SRS system. I had my wallet (with my proxy card in it) along with my cell phone and a birthday greeting card on the passenger seat last night, maybe it triggered it?
Let's hope for the best.
RESTR. SYS. DEFECT!
SRS
VISIT WORKSHOP!
I can clear it out with the R button, but the SRS light stays on.
I pulled over, turned the car off, turned it back on, 10 seconds later the same message comes on.
Any clue to what this could mean and if it's seriouse?

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I moved the pass seat too forward and minutely pulled the plug out of the brain.. My SRS light was on for 2 weeks until I had my friend clear the code with his computer..
I moved the pass seat too forward and minutely pulled the plug out of the brain.. My SRS light was on for 2 weeks until I had my friend clear the code with his computer..
The fix was losing the connectors under both front seats and making a solid soldered connection.
I called the dealership they said absolutely no to clearing the light for safety reasons from their part. They want $220 for diagnostic aka linking their computer to my car... What choice do I have?
Sorry, that I can't help with your problem, though.
Anyhow, my dad drove the car today and I sat on the passenger seat. Upon adjusting the passenger seat, the SRS light came on. After doing a bit of reading about this issue, there are many possible scenarios to consider: loose sensor connection, bad program issue, tension belt something, moisture, and/or (what's a) clockspring (?).
This car had virtually no problems since buying it CPO (54k kms under its belt) until i decided to go for a car wash. The problem surfaced the next day. Anyway, I'm 0-tech knowledge on this car. My question for now is, since it appeared after i adjusted the seat that it might be this sensor under the seat, where can i locate it? What other self diagnostics can i do on my own for now. Mind you, i don't have any computer diagnostics for this car.
After reading here on the forum, I am going to check the connections under the seat, make sure they aren't frayed or damaged.
The other thing you should check is that the carpet on the passenger side isn't wet. Water can enter the fresh air intake if there is a clog under the hood vent. If the carpet is wet, chances are the electronics under the back seat got wet.
Good luck and I will report if I solve my problem.
The interior is water-tight and no leaks or any evidence of it. Checked the wires under the seat which triggered the srs warning light and there was nothing evident to me that would've caused this to go off.
I took it to the dealer to have it checked. Fault code found was 91A3 and the resistance was found to be too targe. Electrical tests done and it was found that an open circuit in harness for the lead seat belt buckle was the culprit. They took out the seat, replaced it, cleared the codes and it was solved.
Good news is that this car is still under warranty so, while owning this car, its a win for me.
I had this cleared by a non dealer with the software twice already and it keeps coming back. Each time the code points to the seat sensor and the seatbelt recepticle. The recepticle works fine so not sure why that code would come up.
My driver's side seatbelt at times gets stuck though will not extend (hence I can't put it on) Its as if it thinks it's in an accident and will not allow me to pull it. I've tried any number of speeds, directions, etc. same result. And yet at times it works fine. Perhaps this has something to do with it as well even if the "code" doesnt show it?
I hate to think I'm going to have to pay thousands to the dealer just to have them remove this light and fix this thing but I can't keep driving with this seatbelt issue anymore.
any final saving thoughts?
Thanks!
very common.
check the reed valve recall, water can be entering your cabin from the climate control
https://mbworld.org/forums/s-class-w...-flooding.html








