RomA8L 2006

My Audi A8L D3 2006 4.2L V8 Gas engine was water flooded unfortunately and since then i have no MMI working at all, screen is off and commands buttons on center console are off even though i repair all other issues and the car starts and run fine now.
Water didn't reach the MMI interface module behind the glove box, that part was dry and safe but they told me after running a scan that the module is not working.
My question is: is there a way for me to control with a software or some to see if the module is working or not before trying to purchase another interface module?

Thank you

ltooz_a6_a8_q7

Your Bluetooth module under the carpet driver seat is wet, dry it and it may work
Cheers,
Louis

JulianHicks

A part-working MMI can be used for checking modules but a 'dead' MMI needs a 'proper' scan with a scan tool on the diagnostic bus.
You didn't say what 'scan' was done but a proper 'Autoscan' VCDS scan with output together with an associated 'Optical Bus' scan will tell you where to start problem fixing.
It's probably worth shelling out $199 to buy your own VCDS system if you plan to keep the A8.

Julian

RomA8L 2006

Hello JulianHicks, thank you for your reply. I actually think i need to get my own VCDS Scan, i actually don't know what kind of scan the shop i sent the car to performed. But my question is what is the right VCDS to get for my car and to get it from. It's a 2006 A8L (D3 Version) V8 4.2L American version. Thank you.

RomA8L 2006

Hello Itooz_a6_a8_q7. Thank you for your answer, i'm not saying that's not the problem but it sounds weird to me. At first the bluetooth module was sink in water when the flood happened, i did removed all carpets and everything inside the car all the way to the Aluminium chassis and let everything dry. So ii is supposed to be totally dry under there now unless some little moisture got in there. But i don't knosw the link between the bluetooth module being wet and the whole system not working. Can you explain it to me a little more in details?
Thank you

ltooz_a6_a8_q7

All MMI stuff use optical MOST bus. One fails all fail hence your MMI is dead. Think of it as your Christmas light, 1 bulb out the whole string is dead.

http://www.dognmonkey.com/audi/what-...-audi-mmi.html
Cheers,
Louis

JulianHicks

Sorry Louis, don't agree with that. If one of the devices on the optical loop fail, the MMI normally starts, opens the screen and then closes several seconds later when it discovers the loop isn't complete.
My understanding is that this MMI is totally dead.

Julian

JulianHicks

You don't actually buy VCDS [the software]; you buy an Interface to connect to the diagnostic port in your car via a USB adapter in a Windows PC. The 'home user' interface is the HEX-V2 3VIN [that is can make updates on 3 cars] - $199; you then download VCDS, install it and run it with the cable attached to the car. The car interface [aka OBD port] is standard on 'all' cars so you can use VCDS on any Audi VAG group cars. The numbers of cars that can be scanned with VCDS and the Interface is unlimited but changes are limited to three different cars in the version above. My view is that $199 for just your own car is worth the money; anything else is a bonus.

Not sure where you're from but I guess the US, as you have a NAR model Maybe RossTech direct is your best bet?

Julian

JulianHicks

BTW; here's some sample scans from potentially broken and working Interface boxes:

Scan from a potentially broken Interfacebox [aka Control Head]

-------------------------------------------------------------------------------
Address 07: Control Head
Cannot be reached

-------------------------------------------------------------------------------

Scan from a working Interfacebox [aka Control Head]

-------------------------------------------------------------------------------
Address 07: Control Head Labels: 4E0-910-7xx-07.lbl
Part No SW: 4E0 910 769 Q HW: 4E0 035 729 A
Component: Interfacebox H43 5570
Revision: 00000000 Serial number: 300KS047541498
Coding: 0000002
Shop #: WSC 00000 000 00000
VCID: 3A7B5589758E58969F-806E

Subsystem 1 - Part No: 4E0 910 609 A
Component: Bedienteil MMI H42 0020

Subsystem 2 - Serial number: 318IE047510004

Subsystem 3 - Serial number: 7409.09.0400000000218B0053ÿ

Subsystem 4 - Serial number: 8B0053ÿ

No fault code found.

Julian

ltooz_a6_a8_q7

Yes, you're correct Julian, I did miss that but I don't convince that you need VCDS to troubleshoot MMI problems because its report is ambiguous. I did the experiment with open loop test and VCDS reported my head unit and everything else in the loop is bad.
So, if the MMI doesn't boot up at all, chances are the CAN bus and head unit can be bad, but since this car is under water, there is another box under the passenger seat where I disabled the MMI screen may be shot also.
What everyone needs is the loop test device, not VCDS.
Cheers,
Louis