SRS light will not go out:
#1
09-08-2018, 08:05 PM
#4
09-09-2018, 11:39 AM
Pro Wrench
SRS fault is due to either the short circuit in the airbag system or in the seat belt pre-tensionser system. I have a Nanocom which will diagnose and confirm one of the two.
As Saturine suggested, you can always clean out the contacts in the seat belt pre-tensionser system first. If the SRS light persists, it is most likely a short circuit in the airbag system. A common fault is the rotary coupler in the steering wheel. I do off-road wheeling often. I have had to change the rotary coupler twice, possibly due to constant vibration which seems to create short circuits in the rotary coupler mechanism.
Note: this is a safety system fault. You can't simply erase the fault using an OBD reader and make it go away. It will come back right away if the problem is not fixed. Also DISCONNECT the battery before starting any work to make sure the airbag does not inadvertently go off.
Some videos to help you...
Seat belt tensioner:
Rotary coupler:
Good luck!
As Saturine suggested, you can always clean out the contacts in the seat belt pre-tensionser system first. If the SRS light persists, it is most likely a short circuit in the airbag system. A common fault is the rotary coupler in the steering wheel. I do off-road wheeling often. I have had to change the rotary coupler twice, possibly due to constant vibration which seems to create short circuits in the rotary coupler mechanism.
Note: this is a safety system fault. You can't simply erase the fault using an OBD reader and make it go away. It will come back right away if the problem is not fixed. Also DISCONNECT the battery before starting any work to make sure the airbag does not inadvertently go off.
Some videos to help you...
Seat belt tensioner:
Rotary coupler:
Good luck!
Last edited by acg; 09-09-2018 at 09:47 PM.
#5
09-09-2018, 01:24 PM
Super Moderator
#7
09-09-2018, 08:14 PM
Outstanding information!
Thanks for the videos!
I will check these connections.
someone asked if the buttons on my steering wheel worked....
the horn works; but the cruise control does not; there is an aftermarket radio so the stereo buttons do not work either (although I have a thread asking about that).
thanks
Doc
Thanks for the videos!
I will check these connections.
someone asked if the buttons on my steering wheel worked....
the horn works; but the cruise control does not; there is an aftermarket radio so the stereo buttons do not work either (although I have a thread asking about that).
thanks
Doc
#8
10-11-2018, 03:43 PM
SRS fault is due to either the short circuit in the airbag system or in the seat belt pre-tensionser system. I have a Nanocom which will diagnose and confirm one of the two.
As Saturine suggested, you can always clean out the contacts in the seat belt pre-tensionser system first. If the SRS light persists, it is most likely a short circuit in the airbag system. A common fault is the rotary coupler in the steering wheel. I do off-road wheeling often. I have had to change the rotary coupler twice, possibly due to constant vibration which seems to create short circuits in the rotary coupler mechanism.
Note: this is a safety system fault. You can't simply erase the fault using an OBD reader and make it go away. It will come back right away if the problem is not fixed. Also DISCONNECT the battery before starting any work to make sure the airbag does not inadvertently go off.
Some videos to help you...
Seat belt tensioner:
https://www.youtube.com/watch?v=3NHUK-34tJU
Rotary coupler:
https://www.youtube.com/watch?v=Rl3HeZX0aag
Good luck!
As Saturine suggested, you can always clean out the contacts in the seat belt pre-tensionser system first. If the SRS light persists, it is most likely a short circuit in the airbag system. A common fault is the rotary coupler in the steering wheel. I do off-road wheeling often. I have had to change the rotary coupler twice, possibly due to constant vibration which seems to create short circuits in the rotary coupler mechanism.
Note: this is a safety system fault. You can't simply erase the fault using an OBD reader and make it go away. It will come back right away if the problem is not fixed. Also DISCONNECT the battery before starting any work to make sure the airbag does not inadvertently go off.
Some videos to help you...
Seat belt tensioner:
https://www.youtube.com/watch?v=3NHUK-34tJU
Rotary coupler:
https://www.youtube.com/watch?v=Rl3HeZX0aag
Good luck!
one of them did have a small circle indentation but no slot.
Anyone have any commentary to add to or explain this?
p.s.
the change of the air bag did not remove the SRS light...so now I am left with the assumption that it is the clock spring. Yet, the horns work, and the cruise control works. The radio controls do not, but that is because the aftermarket raisin wasn’t connected to the steering wheel...this is why I have a hard time believing the clock spring needs replacing; but what else could it be?
Doc
#9
10-11-2018, 05:01 PM
Pro Wrench
neither of the air bags, not the one I removed, nor the one I replaced it with, had that slot noted in the video.
one of them did have a small circle indentation but no slot.
Anyone have any commentary to add to or explain this?
p.s.
the change of the air bag did not remove the SRS light...so now I am left with the assumption that it is the clock spring. Yet, the horns work, and the cruise control works. The radio controls do not, but that is because the aftermarket raisin wasn’t connected to the steering wheel...this is why I have a hard time believing the clock spring needs replacing; but what else could it be?
Doc
The first hunch was the rotary coupler. We replaced it and the error did not go away. (Note: you can't simply clear away error codes for safety systems. The error light will only go away after the short circuit is fixed and full circuit path is restored).
It turned out to be a faulty SRS ECU. A used ECU replacement fixed the problem. Hope this helps.
Last edited by acg; 10-11-2018 at 09:33 PM.
#10
10-11-2018, 06:01 PM
Recovery Vehicle