Electric passenger mirror

[Giles]

Berlingo, 2006 model.

Hi all, I was wondering if anyone had fixed the electric passenger mirror? The remote control on it is not working. I have checked the fuses although I have struggling to find the exact right one but all those in the internal fusebox seem fine. I am uncertain if the heated mirror part of it is also faulty and may be related. I have disconnected the wiring harness behind the remote control switch and checked that the red wire has 12v and it does, this would imply that a voltage supply is at least getting to the control switch. The ground cable to the socket is also continuous to the chassis. On the wing mirror I cannot get a reading on the two wires that supply the power for the heated mirror element. I have looked at the two motors that via a small gear and ratchet move the mirror around but they just sit there doing nothing.

It may be a common earth problem that is affecting both the heater and the motors. I am stuck as to how to trace the common earth and where it attaches to the chassis. 

If anyone has tackled this before, figured out how it works and got it going again I would be really grateful for any tips, ideas or hints.

Many thanks

Giles