The Nanocom is showing drivers air bag open circuit. Is the cable in yellow ducting from the steering column to the SRS loom the "shorting link" which the manual says to disconnect? I can't see anything else.
I've disconnected all the leads and given them a spray clean and cleared the fault a couple of times. The only thing left is the rotary coupler.Is this a frequent culprit?
Thanks as always.

I had the same fault on the D2 (airbag open circuit). I disconnected, sprayed and reconnected the air bag connector and the fault went away. It came back after a couple of weeks. I did it again and I haven’t had my SRS light come back for a few months now. (My fault was the passenger side though so this probably doesn’t help you much).

Thanks Harv. I'll have a look at the rotary coupler I think as it's the only bit I haven't cleaned.

I thought the shorting link was inside the plug or socket so it puts a short on when the plug is disconnected rather than leaving it open circuit? With both ends disconnected it's a simple enough job to check continuity through the coupler. Just don't stick your meter on with anything connected to it. Does the horn work?

Good point Richard. No it doesn't so another thing to check. I'll try not to blow myself into the boot testing things!

One bit ticked off the list. It was the rotary coupler at fault. Not having seen one before I assumed I could clean it but obviously not, so got a replacement from the excellent Paul in Rusper and all is good again -- except the SRS light is still on because one of the warning lamps failed.

The EAS is the next problem but I'll do a separate post on that.

If the rotary coupler in the p38 is like most other vehicles, they are usually a long coil of ribbon cable that winds up and unwinds as you turn the wheel. Horn ones tend to be a lot simpler and are just a couple of tracks and a pair of contacts, but obviously its less critical if the horn doesn't work than an airbag I guess. Some cars seem to suffer more with problems than others though.

Instructions for removing the coupler tell you to do it with the steering centralised and tape it in position as soon as it is off. If you don't do one or the other, the ribbon breaks on full lock.