Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi, Jumping the connector will just result in the ECU detecting a dead short in the system so this would still put a fault in the system. The resistance for the seatbelt should be around 2-5Ω. You could check the resistance through the seatbelt but this is only advisable with a professional qualitly meter as cheaper ones can actually trigger the seatbelt tensioner when checking the resistance - not good!
Another good alternative is to simulate a resistance across the seatbelt connector so the SRS ECU thinks the seatbelt is ok - we use a simulator to connect up & to select any resistance we choose. A cheaper alternative would be to get a 3 or 4 Ω resistor from an electronics shop to put across the connector with the seatbelt disconnected.
However please be aware that the SRS light will stay on until the faults are cleared with a diagnostic tool, it will not go out just by curing the fault!
Best regards, Paul
Would replacing the actual belt on seat be advisable? Belt does not retract properly in seat. I have already replaced latch.
Where is the resistance measured, on main connected below seat or on belt itself?
I would first put the resistor at the connector on the belt itself - this would then rule out the complete circuit back to the SRS control unit & confirm the fault is in the seatbelt if the fault is cleared & the SRS light goes out.
Did you ever find out the codes that were stored?
The connector for the ETR is shown just below the seatbelt reel in the side of the ETR - it looks like a long cylinder on the bottom of the reel.
All other connectors should remain connected so the SRS control unit see's a complete circuit.
Dont forget the fault codes will need to be cleared before the SRS light will go out.
Once you have access to the seatbelt you should have enough room to test it in situ.
There is no way of clearing the codes other than with a diagnostic tool I'm afraid.
That is correct - if it is the ETR then with the correct resistance through the connector the light should go out once the codes are cleared.
This is assuming this is what the code relates to!
No problem, Let me know how you get on.
No problem at all. Glad to help!