A few weeks ago I fitted a new stalk with Cruise buttons, and then when the car was in for something else at Vx, they kindly Tech2'd it for me to enable the CC. They reported that there was a "missing clutch switch" error, so I just shorted out the connector (since it's "normally closed") and I found that the CC worked fine. Then, for no reason it just stopped - so I double checked the connections/stalk etc, yet it was still inoperative. The next morning, it just worked again. Then about 2 weeks later, it just stopped working again. After checking everything, with no success, I just thought i'd reset the ECU, by disconnecting the battery. It worked, and the CC worked fine for another 2 or 3 weeks. Then it stopped again, and as soon as I disconnected/reconnected the battery it was fine. Then yesterday (after working for 4 weeks), it just stopped again, and the same cure worked. I'm now confused - I know that all connections are sound, and I've got no orange light indicating a fault (yes the bulb is working!), yet this keep happening. I can't see that "bypass" of the clutch switch can be causing this, can it? I always turn off the CC before pressing the clutch (normally this just happens as a result of touching the brakes before changing gear anyway) - and even if I don't, and try clutching without disabling it, the CC is intellegent to know that the revs are rising with no increase in road speed, and it immediately turns itself off after a rise of 200-300 revs. It seems that the ECU is losing it's "enabled" state for the CC, but why would it work after a reset. I realise I should probably wait until it stops again, and then get Vx to tech2 it for diagnostics (there is no paperclip method on this late model), but I just can't think why it would turn itself on and off like this. Does anyone know of anything similar happening with "feature enables". Could it be the clutch switch "botch"? (I still think this is unlikely) Any other thoughts? Rich PS - It's a facelift / fly-by-wire 2.6 Omega - so there is no "CC unit" as such, it's just part of the ECU control of the normal throttle servo.
