p38 srs airbag fault

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mgmayo

mgmayo

Active Member
Posts
133
Location
Co.Mayo, west of Ireland
Hi all, I have airbag fault message on my 95 p38. I used faultmate to clear it but it only did briefly. It diagnosed THE AIRBAG FIRING CIRCUIT IS MEASURING SHORT TO GROUND. On another forum it recommended changing the rotary coupler which I now have done. However I am still left with the fault. I now suspect the DCU as a new fault now is THE AIRBAG CONTROL UNIT HAS DETECTED AN INTERNAL FAULT. I have checked most of the connections but did not want to go as far as testing the short diodes until I have exhausted all other possibilities. Any ideas appreciated
 
I had ordered an ecu when I posted, but I was looking for more things to test while waiting. Now that I have taken the time to test the original rotary coupler I find that it is ok, so points more towards the ecu. I should know early next week.
 
I got and fitted a tested & working ecu, got the faultmate updated, however after clearing the fault I am still left with THE AIRBAG FIRING CIRCUIT IS MEASURING SHORT TO GROUND.
Can the whole system be disabled?
I use this as a commercialised work vehicle and only do short local runs with it towing a trailer. Being 95 I won't be selling it and I have for many years been in vehicles prior to airbags that I dont feel the need for them.
 
I am still trying to resolve this 'airbag fault' .
The recorded fault is 'firing circuit short to ground '.
Clearing the fault only worked for a few seconds.
I fitted a different ecu & rotary coupler a year ago but no fix.
I have now fitted 2 bags and ecu from a p38 that did not have fault. However I still have the old fault and now also have warning lamp is short to ground, eventhough warning lamp is lit. These 2 faults won't clear even for a few secs. Any pointers appreciated.
 
I would guess you have a cable that has chafed through. Not a lot of wiring involved, there are 2 sensors on the chassis either side of the RAD, thats where I would start looking as it say's "firing Circuit short to ground"
 
I had this fault, I also could pick up no signal from my diagnostic plug so traced the wireing through and found a broken brown wire going into a white plug behind the offside kick panel in the drivers footwell, I repaired the wire and also cleaned up the plug also charged the battery which tbh was not that low and was starting the motor no probs and the srs light went out and does so every time now. If I,m honest I think it was more luck than anything it canceling the light as I do not have a wireing diagram and don't even know if that plug has anything to do with it. Datatek, wammers and v8 rick should be able to tell you more as I left well alone after that and did not investigate further.
Good luck
Davie:D:D:D
 
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