A6 Avant C7 2014 - Dead instruments, MMI screen and centre console controls

[corkyballs]

Driving along my instruments flickered a couple of times and went off. Having had issues like this in a Vauxhall I stopped the car and restarted it.

Now theres no instruments, the screen for the MMI doesnt flip up, the centre console controls dont work, the parking sensors dont work, the front wipers dont work and some but not all steering wheel controls are dead. The radio is still playing the last station it was tuned to and the system still connects to my phone over bluetooth. The car starts and drives fine.

I've checked all the fuses (divers side, passenger side, rear, steering column and under the ECU), had the dash off and replaced the instrument cluster with a known good one, checked the wiring as best I can for damage but nothing obvious is jumping out at me.

VCDS is throwing hundreds of faults all saying words to the effect of 'inconcievable value' or something like that.

In the fuse panel in the passenger side the lower (black) carrier appears to have two separate power supplies feeding the fuses. The first tests out fine at 12V but the other half (where coincedently) the fuses for the 'Control panel control unit' resides is only measuring at just shy of 1V - is this normal ? I didnt know if this was some kind of CANBUS thing or not as I'm not up on that kind of thing.

My rudimentry fault finding skills are saying 'Is there a relay that feeds this fuse carrier and has it gone down?. The problem is I cant find a wiring diagram or any information relating to what relays do what other than a reference to R2 under the steering wheel being Terminal 15 supply relay which means nothing to me.

Can anyone point me in the right direction please ?

[mazerati]

Hi,

Had a similar thing happen years ago and was indeed relay 2 (terminal 15)
Seem to remember it was the middle relay of three but not sure.
Terminal 15 is basically live when ignition is on.

Good luck

[SimonC6]

Hi there,

I have a copy of ELSA Win, its what technicians use to repair the cars with, if permitted by the moderators, I could possibly send you over the wiring for yr make and model I believe? Let me check it covers the C7 variant plus allowing moderators to give the OK etc.

Cheers

Simon