MMI on A6 saloon - audio cutting in and out

Wetsump

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I have owned a standard MY2006 A6 saloon for the past three years, which has been running perfectly, until it went in for an annual service. I have used the same independent garage for many years and have faith in their mechanics. The car is running factory fitted MMI High (colour SatNav screen) and that was working perfectly until the service.

Now the radio cuts in and out every three seconds - all the time.

If I press the DVD/CD button, the display shows I have discs loaded and tells me the player is 'Paused'. I can't access the CD player from the console and it won't play any of the discs, though I can load/unload CDs from the unit in the glove box.
The SatNav will display the map showing my location and tracks my progress, but I can't enter any destination.
If I select the phone option, the screen menu simply says 'Please wait..' which is not what it normally does. The car no longer acknowledges or links to my mobile phone via Bluetooth.
It is as if the whole MMI system is going through some sort of reset every three seconds (polling for a missing device?). The top element of the display between the speedo and tacho on the dashboard (which shows which radio station I am tuned to) flashes on and off in time to the radio cutting out.

The garage changed the pollen filter during the service, and I wondered if they had knocked/disconnected a cable when they had the glove box out doing that. The car has been back into the same garage and they have removed the glove box (again) to confirm that all cables are securely connected and nothing was damaged. They disconnected the battery for 10minutes and reconnected it again in an attempt to hard-reset everything, and that made no difference. I have reset MMI (press Setup/rotary button/top right button around the rotary button) and this has made no difference. All the modules in the boot appear OK - with no signs of moisture or loose connectors.

Are there any MMI experts out there who may have an idea where I go to next with this? I am pretty much resigned to taking the car into the local Audi dealer (Newbury, Berkshire) for their advice, but thought I should check here first in case anyone else has previously experienced anything like this and identified a fix.

I don't have access to any diagnostic tools, so can't provide any scanner data, and I appear to be miles from anyone with VCDS kit according to the map.

Thanks, Graham
 
Is your car an Avant ?

Do you have Bose ?

Check for water ingress in your amp if you do. The wiring loom loops right above the MOST connector (fibre optics) on the amp,the water can drop on it from the loom if you do have water ingress and the circuit that controls the MMI system via the MOST connector might be shorting out
 
Is your car an Avant ?

Do you have Bose ?

Check for water ingress in your amp if you do. The wiring loom loops right above the MOST connector (fibre optics) on the amp,the water can drop on it from the loom if you do have water ingress and the circuit that controls the MMI system via the MOST connector might be shorting out

The car is a saloon and it does not have BOSE.
For the amp and related moisture, am I looking in the rear nearside of the boot? If not, then where?
Thanks.
 
I thought that the mute sign only came up when I turned the volume to its lowest setting - but I will check that.
Can I disable the car phone part of the system - so that I get the radio back again?
What and where is the car phone ECU? Is that the box in the mini-rack in the boot with the Bluetooth logo on the side, or is the Bluetooth module separate to the phone ECU?
If it is the phone ECU, is it repairable, or is a replacement module in order?
 
It's under the front passenger seat floor in a large black plastic box. Audi do them on exchange for about 300. You can bypass it but you still need to get to it do so with a fiber joint.
 
don't tell me...
Seat out, door sill off, carpet up? Or is access easier than that?
And thanks VERY much for your prompt response on this.
Any reason for the phone ECU failing - or is just a random act of someone's god?

oh.. and will any diagnostic process confirm this, before I source a replacement and try to fit?

thanks
Graham
 
Last edited:
Yes, correct, that's how you get to it.

It just seems to happen to ECU's of this year, I have replaced loads and so have Audi.
 
so, closure on this item..
I was unable to find anyone locally who could diagnose/confirm the findings, so the car went into Ridgeway Audi in Newbury. Their diagnostics quickly confirmed a faulty phone control unit (thanks, S8Craig) which is located under the passenger seat. Total bill was £550 comprising £175 for labour (including diagnostics) + £285 for the replacement module (W4E0 910 336 MX) + £90VAT. Car went in on Monday morning and I had it back by Tuesday evening. All I had to do was re-pair two mobile phones back into the car's Bluetooth system. I can't complain about the speed of service, but the cost of parts and labour obviously reflect franchised dealer prices - they have to fund the flashy showroom somehow.
The all new A8 in the showroom looked nice, though way out of my price league...
 

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