Fuse Check...Now MMI has stopped working :-(

**Jef trayfoot** · 10-07-2018,12:41 AM

Right. I have used a torch and shone it down the optical leads to make a map. Starting from bt it goes to amp, radio tuner, satnav, gateway control unit, silver box behind glove box and CD changer. That's where I'm lost. I think there is another unit between CD changer and Bluetooth but I can't locate any more. Any ideas?

**Gunnark100** · 10-07-2018,05:21 AM

No, there is not, unless you have ami in glovebox, or some extra added toy

It is hard to believe that 2 units failed same time or optic is broken...but who knows...

**Jef trayfoot** · 10-07-2018,07:16 AM

Is there an optic cable going to the screen? I have been trying to find an optic wiring diagram but cannot find one anywhere.

**Gunnark100** · 10-07-2018,07:20 AM

Originally Posted by Jef trayfoot

Is there an optic cable going to the screen? I have been trying to find an optic wiring diagram but cannot find one anywhere.

No, all modules in optic ring you see on the table if performing optic test... mainunit, cd, telef, radio, voice,amp,tv,gate,nav,ami...all depends from options you have.

**Jef trayfoot** · 10-07-2018,07:22 AM

Where is the voice located?

**Gunnark100** · 10-07-2018,07:23 AM

Inside radio

**JulianHicks** · 10-07-2018,09:07 AM

Originally Posted by Gunnark100

Inside radio

More accurately, the Speech unit is a seperate unit that plugs into the Radio.

It doesn't have any optical connections ...

Julian

**Jef trayfoot** · 10-07-2018,09:51 AM

I've solved it. It was an optic cable coming from the CD changer going to the Bluetooth device. I spend last night in the dark shining a torch down each cable. I found 2 cables that didn't seem to go anywhere but that was the broken one so I took apart one of my loop breaks and used that cable to plug into the input of the bt and output of the CD changer and it all came back to life. I've ordered a length of optic cable and now just have to wait to put it all back together again. I spent £400 with the Audi dealer and had nothing to show for it. It was the knowledge of people on here that really helped. Thanks guys

**Gunnark100** · 10-07-2018,10:11 AM

Glad mystery solved

, so what is-was the location where optic is broken, just maybe this location will become common in future?

**Jef trayfoot** · 10-07-2018,01:07 PM

Originally Posted by Gunnark100

Glad mystery solved

, so what is-was the location where optic is broken, just maybe this location will become common in future?

It was the optic connector on the back of the CD player in the glove box. There are arrows on the cone tor to say in and out. The out goes to the Bluetooth module which is under the passenger carpet and has another optic connector with the same arrows and this was the 'in' arrow. I just took the connectors apart and put my own fibre optic wire (bought from ebay). Taking the connectors apart is easy and there are lots of YouTube videos to show how.