Any ideas gratefully received on the following:
- cruise control has stopped working completely
- vacuum on diaphragm on the engine holds fine
- no obvious cracks or problems with the hoses
- light comes on when switch is depressed on the dashboard
can anyone think of what to look at next?
Thanks guys. My brake lights are ok; I just checked the switch under
the brake pedal (have an auto box) and it's fine - delivers 12V from
the fascia switch. Wondering now how to check the whole of the vacuum
line whilst stationary and how the switching from the steering wheel
connects up. Any suggestions?
Thanks in advance
OK, I think I've found the problem. A 9 pin female multiplug with 6
active pins is dangling disconnected. It's under the steering wheel and
I can't see what it plugs into.
Looking at the main circuit diagrams for 1990 model year RR, it seems
certain that it's for the cruise control. The available cable doesn't
seem long enough to get behind the instrument binnacle; though the
wires have been previously bound up so it might reach.
Does it plug in there somewhere, picking up info from the speedo etc?
Paul 1990 US Spec RR V8 EFI LPG
In message , paul
Think this one runs on an electrical vacuum pump located near side in
chassis under where jack is stored. The pipe from vac pump is a
possibility. Also upward stops for brake pedal are worthy of a check as
when brake is depressed it allows air into system and disconnects cruise
control. Vac pipe also to check from brake switch back to junction
behind screen washer bottle.