Originally Posted by SD1too (Post 2930490)

Hello Dave,

First of all thank you for your clear and comprehensive description of the fault in post no. 1.

I've checked the MGR manual and whereas the individual passenger door switches are hard wired to the BCU, all the driver's door switches communicate via a unidirectional dedicated data bus. This would appear to confirm that your fault most likely lies with the switch module or the wiring to the BCU.

Since all windows and the rear locking facility intermittently fail to operate, I would turn my attention to the contacts in the 6 pin connector (C0081) mounted to the rear of the module. Try switch cleaner and/or gently closing the female contacts slightly using a very fine tool.

1 = data stream to BCU
2 = switch illumination PWM signal
3 = 12v auxiliary supply from fuse 11
4 = Earth
5 = not used
6 = 12v battery

I hope that this helps! :}

Simon

Originally Posted by Bob Walker (Post 2930527)

Hi Wuz
Have you seen this
https://www.youtube.com/watch?v=7RGvGz2P9mo
Bob

Originally Posted by Wuvz (Post 2930655)

Next thing to check I suppose is to find the other end of wire 1, where it connects to the BCU ... Do you have any idea which of the many wires going into the BCU is the data wire from the driver's door switches?

Originally Posted by SD1too (Post 2930694)

This white/black wire goes via a 27 pin connector (C0336/C0459) in a rubber boot where the door loom enters the 'A' pillar to join the main harness. It's shown positioned just above the door check strap and is in a prime position for damage.

At the BCU it arrives on C0660 (centre connector, black, 54 pins) pin 33.

Taking great care check that the two 12v supplies are present on pins 3 & 6 at the door switchpack connector (using pin 4 as the earth for your meter if you can).

Simon

Originally Posted by Wuvz (Post 2931047)

Thanks for that. (How does the "thank" function on this forum work? I can't see a button - am I missing something or does one need a certain number of posts before it appears?)


Looks like the wheelarch liner needs to come out to get at the multiplug, so that'll have to wait until I have a bit more time as I remember it being a right faff to get off last time I tried (the retaining screws are showing their age). Hopefully the multimeter will be enough to find out what's going wrong - if not then it may indeed be time for a T4 session...

Originally Posted by Wuvz (Post 2931047)

Thanks for that. (How does the "thank" function on this forum work? I can't see a button - am I missing something or does one need a certain number of posts before it appears?)
...

Originally Posted by KWIL (Post 2930499)

Beware. Fibreglass pencils are VERY abrasive.