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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 4317
Experience:  Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
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Srs light is on. driver side seat belt extender doesnt work.

Resolved Question:

srs light is on. driver side seat belt extender doesnt work. could this be the problem
Submitted: 8 years ago.
Category: Mercedes
Expert:  MB Paul replied 8 years ago.

hi,

 

have both of these faults occoured together then?

 

best regards, Paul

Customer: replied 8 years ago.

maybe a day or 2 later. is that a common problem. there has been no other problems

Expert:  MB Paul replied 8 years ago.

hi,

 

the car will need to be plugged into a diagnostic tool to check for fault codes.

 

there are some common problems but none that I can think of that would be related - unless it is a fault in the seatbelt pre-tensioner.

 

it may just be coincidence.

 

the seatbelt extender not working is often down to a programming issue - the control module has the facility to be reset if it detects a blockage via Mercedes STAR diagnosis, if this is the fault it can be re-programmed.

 

The SRS has a few common issues - the passenger seat sensor can fail, the side airbag can have a high resistance in the connectors which would need to be replaced, or the contact spiral wiring can have similar problems. all of these would put the SRS light on.

 

without a diagnostic read out there is no way to know what the fault is or to reset the SRS light.

 

Let me know if you would like any further information.

 

Best regards, Paul

Customer: replied 8 years ago.

are their any symptons with a bad seat sensor

Expert:  MB Paul replied 8 years ago.

hi,

 

only the fact that the SRS light comes on - it is pretty much the only symptom that you will get with most items on the SRS circuit.

 

it would mean the SRS control unit would not know if somebody was sat in the passenger seat if it needed to deploy the airbags.

 

best regards, Paul

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