On my 1998 MGF, I’ve been attempting to trace the cause of the SRS warning light being on. Using pscan, I get the error: 150B Front airbag circuit driver Short to ground.
From my understanding of auto-electrics, this is rather vague and I believe, from what I’ve read on various forums, that it can be caused by breakages in the rotary coupler and the ECU as well as damage to wiring insulation.
So far, I've replaced the connectors under the seats, both pre-tensioners and the rotary coupler. Next is the airbag ECU. That will be all of the components of the SRS system, so if the light is still on I don't know what I'll do!
When removing the old rotary coupler, I was excited to see strands of black plastic, which I assumed came from the internal tape—indicating that there was a breakage. But on dismantling the coupler, the tape is unbroken and a cream colour. I’m guessing that the strands were worn away from the edge of the coupler body, from 33 years of the steering wheel being turned.
I had two brainwaves: 1) Does the seatbelt need to be fastened when scanning for faults? To complete a circuit?
2) Do I have to extinguish the warning light using pscan? What I mean is, does it being lit indicate historic errors—which I've since repaired? If so, how do I turn the light off?
I’m confused because watching MGLee’s excellent videos on YouTube, he replaced the rotary coupler, which made the warning light disappear!
On my 1998 MGF, I’ve been attempting to trace the cause of the SRS warning light being on. Using pscan, I get the error: 150B Front airbag circuit driver Short to ground.