2007 C6 A6 Sedan 3.2 CVT MMI DEAD

[StangGT5]

2007 C6 A6 Sedan 3.2 CVT MMI Problem

I bought the car a couple months ago with the MMI completely dead. The car runs,drives, and looks great. A/C blows cold, everything but the MMI and trunk release switches work (key fob opens trunk so I dont care). The screen is completely dead and the control buttons do not light up. I scanned it with my VAGCOM 12.2.2 HEX CAN and did a Optical Bus test. Every single component showed electrical and optical ERROR. Deciding I did not feel like dealing with it I sent it to the only local Audi dealer. They had it for three weeks and said they couldnt figure it out.

Getting it back, I checked all the fuses three times and found the telematics fuse was blown. I found the bluetooth/tele module with corrosion all over it. I left the module unplugged, replaced the fuse, and did the optical test again. This time I found about 3/4 of the system showed "OK". I ordered a new module, went to plug it in and the fuse blew. I took the connector apart to find two wires in the larger of the two slides melted together. I replaced the larger portion in the 54 PIN electrical connector with a pig tail from a 2008 A6 , plugged in the replacement module, and replaced the fuse. Now I am at this point:
Control Module Part Number: 4F0 910 468 A
Component and/or Version: Gateway H11 0070

Optical Bus Diagnostic : Standard

Controller Electrical Optical
19-CAN Gateway OK ERROR
07-Control Head(High/D3) OK OK
0E-Media Player 1 OK OK
77-Telephone OK ERROR
47-Sound System OK ERROR
56-Radio OK OK
37-Navigation ERROR ERROR


Chassis Type: 4F (4F0)
Scan: 01 02 03 05 07 08 09 0E 15 16 17 19 27 37 42 46 47 4E 4F 52
53 56 5E 61 62 65 72 77

Mileage: 160650km/99823miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
07-Control Head -- Status: Cannot be reached 1100
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: Malfunction 0010
0E-Media Player 1 -- Status: Cannot be reached 1100
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
25-Immobilizer -- Status: OK 0000
27-Ctrl Head, Rear -- Status: Cannot be reached 1100
37-Navigation -- Status: Cannot be reached 1100
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: Cannot be reached 1100
4E-Ctrl Head RR -- Status: Cannot be reached 1100
4F-Centr. Electr. II -- Status: Malfunction 0010
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
56-Radio -- Status: Cannot be reached 1100
5E-Ctrl Head LR -- Status: Cannot be reached 1100
61-Battery Regul. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
65-Tire Pressure -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: Cannot be reached 1100

Address 19: CAN Gateway Labels: 4F0-910-468.lbl
Control Module Part Number: 4F0 910 468 A HW: 4F0 907 468 D
Component and/or Version: Gateway H11 0070
Software Coding: 6CFE53C51FB105
Work Shop Code: WSC 07109 444 10332
VCID: 275D40FF96B5AC26FAD-8072
2 Faults Found:

00470 - Combination comfort Databus in Single Wire
007 - Short to Ground
Freeze Frame:
Fault Status: 01100111
Fault Priority: 3
Fault Frequency: 1
Reset counter: 161
Mileage: 160658 km
Time Indication: 0
Date: 2006.07.06
Time: 14:11:30

00384 - Optical Databus
011 - Open Circuit
Freeze Frame:
Fault Status: 01101011
Fault Priority: 5
Fault Frequency: 1
Reset counter: 161
Mileage: 160658 km
Time Indication: 0
Date: 2006.07.06

The MMI is still very dead and I am stumped as to where to go next. Although the modules electrically show "OK" other than the Navigation, the only module I can communicate with is the CAN Gateway. Basically, the only thing that changed after replacing the bluetooth/tele module was that the Telephone now shows "OK" electrically

[FormulaElement]

Am i reading that correct and seeing that the Audi dealer had it for three weeks and didn't even notice that the fuse was blown and that your bluetooth module was corroded? I would go to a new dealer, that would be the most expensive but easiest way to figure out what's wrong. If your date is right on your car, the fault codes started when the car was brand new. So it could even be faulty MMI hardware, but there is almost no way to tell...

Anyways, this could really be a nightmare to diagnose. I wish I could help you more but I don't have any suggestions besides to check every fuse (not by sight) and check all the wiring in the MMI system with a fiber optic bypass loop and hope that something isn't working or connected all the way. The most common points of failure are from the AMP and the MMI circuit board.

If you haven't done a hard reset of your MMI since replacing the module, I would try that. Or just unplug your battery for a couple minutes then plug it back in.

[StangGT5]

I couldnt believe they did not catch a fuse...the local dealer either did not want to spend the time to diagnose it or they are incompetent. The next closest is hours away. I have a great background with Audis pre 05 when all this tech came about. I owned a 2005 3.2Q A6 years ago and never had a problem with anything but the abs module (typical audi). I have an Audi loop adapter, do I just plug it in everywhere there is an optical port and try it each time I bypass a module? At some modules I get the red light, others I do not. I saw the AMP is a common failure on Avants but this one is a sedan and dry as a bone back there even in wet weather. Ive seen people with similarly dead MMI systems replace the control module behind the glove box with success but it just seems odd when tested that the modules all say OK except the navigation and yet I cannot connect to any of them save for the CAN gateway.

[steel2040]

Could be the MMI control unit like you read or the connection to and from the control unit hers ross techs on the one wire mode http://wiki.ross-tech.com/wiki/index.php/00470.
The open circut looks like its the only culprit be it bad controler or bad connection on wires .

[StangGT5]

UPDATE: This morning I decided to take the negative cable off the battery for a while, say 10-20 mins. After reconnecting I noticed the screen was still dead and the buttons were not lit up. The same codes were in the gateway module and the optical test showed the same results. However, the screen came on after I did the optical test! Albeit for a few seconds just to show the black, red, and silver AUDI MMI logo, but it did come on so that has to mean some progress has been made. It comes on maybe 30 secs to a minute after an optical bus test is completed and is fairly consistent. I also noticed when I do the Optical test wit the rear seats down I can hear a click in the trunk. I have the whole bracket/assembly with the radio module and amp laying out of its cubby on the trunk floor so maybe Im just hearing the amp power up?

[SinCityA6]

I got nothing for this, but I am watching the thread so I can learn. Keep the updates coming and good luck!

[steel2040]

Ok you said you tested the optical with Vag right did you do both Standard to 3dB Attenuation? Do you have a Most optical loop to test to go through each piece ?

[FormulaElement]

I couldnt believe they did not catch a fuse...the local dealer either did not want to spend the time to diagnose it or they are incompetent. The next closest is hours away. I have a great background with Audiis tech came about. I owned a 2005 3.2Q A6 years ago and never had a problem with anything but the abs module (typical audi). I have an Audi loop adapter, do I just plug it in everywhere there is an optical port and try it each time I bypass a module? At some modules I get the red light, others I do not. I saw the AMP is a common failure on Avants but this one is a sedan and dry as a bone back there even in wet weather. Ive seen people with similarly dead MMI systems replace the control module behind the glove box with success but it just seems odd when tested that the modules all say OK except the navigation and yet I cannot connect to any of them save for the CAN gateway.

With the fiber optic loop in these cars, each component isn't connected individually. So if one part of the loop or a module isn't working, then it won't allow data past it. With the bypass you can cutting out each module one at a time, and resetting the MMI to see if it will turn on, but without that specific module. What all modules do you get a red light at? You might want to try bypassing all of them and seeing if your MMI will turn on. This is a great resource for some info and has information on getting a MOST bridge adapter http://http://a6retrofit.tripod.com/...ostbridge.html . With that article in mind, and seeing that your Nav module cannot be accessed... Maybe the bridge adapter there in place of the module is loose, disconnected or bad? Did your car even come with Nav?

I still do believe this could be a fuse hidden somewhere or one that looks ok. I would use a multimeter at each of them. I'm not sure where every fuse for the MMI system is at in these cars but i've read on other Audi models there's MMI fuses in the fuse boxes in the front left and right of the car, along with under the dash on the drivers side, and a couple in the engine department. I will go check my car and see if i can find/pinpoint where all the MMI fuses are.

[StangGT5]

First, thank you all for helping out. Second, I checked the fuses in the left and right side of the dash as well as the trunk with a test light at least 3 times. I also checked to see if there were any missing fuses but the empty slots only had one receptor meaning my car didnt come with whatever accessory that fuse goes to. In the left side of the trunk where the nav module would be on the bottom rack it is empty and just has a MOST loop connector in place. I assume this car being FWD may not have had NAV. My 05 3.2 Q A6 didn't have it either.
I do not remember exactly what modules I've got light to/from I'll go check again to be sure but I believe the glovebox cd player, the MMI control module, and the radio module have light. I tried plugging in the most loop connector I bought new from an Audi dealer at different modules and running tests as well as trying to boot the MMI. On modules where the test showed optical "OK" it would show "ERROR", probably because the modules were plugged in and saying something different than what the adapter supplies. I did both regular and 3dB tests, both showed the same results as far as the "OK/ERROR" values go.

Another UPDATE: I left the battery off again, for 30mins this time, and when I turned it back on I was accosted by a lovely screaming beep telling me my automatic wipers/ headlights were inop. This message came on after I bought the car months ago but pulling the fuse and reinserting it did the trick and the wipers/lights worked fine. Not so much this time, as it is throwing a code for no communication with the wiper module (motor/module one piece in the C6) and no communication with the rain/light sensor. I tried the fuse pull a few times and no go. Goodie, because not only will the auto wipers not work but the wipers are completely inop. According to VAGCOM measuring blocks in the Central Elec. the stalk is sending the appropriate signals when I move the stalk but the light/rain sensor and wiper module show no communication. Oh well, separate issue. If it didn't have such cold A/C, drive so well, and look so good I'd be inclined to push it off a cliff....too bad Florida is flat.

[steel2040]

Oh well, separate issue. If it didn't have such cold A/C, drive so well, and look so good I'd be inclined to push it off a cliff....too bad Florida is flat.

I have a friend in duval county that could make it disappear jk. I do no have nav and was supposed to let me go vag it real quick for a optical to see what I get as a compare with your read out.

[FormulaElement]

First, thank you all for helping out. Second, I checked the fuses in the left and right side of the dash as well as the trunk with a test light at least 3 times. I also checked to see if there were any missing fuses but the empty slots only had one receptor meaning my car didnt come with whatever accessory that fuse goes to. In the left side of the trunk where the nav module would be on the bottom rack it is empty and just has a MOST loop connector in place. I assume this car being FWD may not have had NAV. My 05 3.2 Q A6 didn't have it either.
I do not remember exactly what modules I've got light to/from I'll go check again to be sure but I believe the glovebox cd player, the MMI control module, and the radio module have light. I tried plugging in the most loop connector I bought new from an Audi dealer at different modules and running tests as well as trying to boot the MMI. On modules where the test showed optical "OK" it would show "ERROR", probably because the modules were plugged in and saying something different than what the adapter supplies. I did both regular and 3dB tests, both showed the same results as far as the "OK/ERROR" values go.

Another UPDATE: I left the battery off again, for 30mins this time, and when I turned it back on I was accosted by a lovely screaming beep telling me my automatic wipers/ headlights were inop. This message came on after I bought the car months ago but pulling the fuse and reinserting it did the trick and the wipers/lights worked fine. Not so much this time, as it is throwing a code for no communication with the wiper module (motor/module one piece in the C6) and no communication with the rain/light sensor. I tried the fuse pull a few times and no go. Goodie, because not only will the auto wipers not work but the wipers are completely inop. According to VAGCOM measuring blocks in the Central Elec. the stalk is sending the appropriate signals when I move the stalk but the light/rain sensor and wiper module show no communication. Oh well, separate issue. If it didn't have such cold A/C, drive so well, and look so good I'd be inclined to push it off a cliff....too bad Florida is flat.

It really seems that water has somehow gotten places to be having all of these problems. The car i bought was in florida for the first 8 years of its life and has no electrical problems aside from the TPMS antenna acting whacky and making the TPMS come on/go off randomly. It has been replaced 3 times in the car's life and still has problems so IDK....

BTW dont pull the negative cable from the battery, pull the positive so that all the excess power can safely drain from the components. I don't think it really matters, but i feel since the frame/grounded components connect to the negative side of the battery its safer to pull the positive. I would try unplugging the battery off for a while longer then connect it and turn your car on. Don't run your VAG-com for at least 5+ minutes after your ignition/car is on.

as far as your MMI goes, don't test by using your VAG-Com, do a hard reset of your MMI to test and see if it will work after bypassing a module. If a module was there then not anymore, it will probably cause problems without resetting the MMI and show up as error when you scan for faults. Remember, the electrical components of this car never actually turn off unless the battery dies or is unplugged. To hard reset the MMI there's info here http://www.audizine.com/forum/showth...how-to-do-this In theory, you should see the startup screen like when you first plugged the battery back in.

I have a friend in duval county that could make it disappear jk..

Haha... OP do you have full coverage/GAP protection?? Easiest route to go! JK

[steel2040]

Optical Bus Diagnostic : Standard

Controller Electrical Optical
19-CAN Gateway OK OK
07-Control Head(High/D3) OK OK
0E-Media Player 1 OK OK
77-Telephone OK OK
47-Sound System OK OK
56-Radio OK OK
0F-Digital Radio(SAT) OK OK

Optical Bus Diagnostic : 3dB Attenuation

Controller Electrical Optical
19-CAN Gateway OK OK
07-Control Head(High/D3) OK OK
0E-Media Player 1 OK OK
77-Telephone OK OK
47-Sound System OK OK
56-Radio OK OK
0F-Digital Radio(SAT) OK OK


So your Test below shows you have optical communication with the gateway,Telephone,sound system and nav to me that so what controllers did you not get light on when you Looped I am defintly feeling a controller isnt comming out or the optical could be pinched between to of them.

Controller Electrical Optical
19-CAN Gateway OK ERROR
07-Control Head(High/D3) OK OK
0E-Media Player 1 OK OK
77-Telephone OK ERROR
47-Sound System OK ERROR
56-Radio OK OK
37-Navigation ERROR ERROR

Vag and the comp always list things in order so if you reset or get rid of the nav I would work backwards with the last thing that the optical gave error to see if your unit comes back on.

do a hard reset of your MMI to test and see if it will work after bypassing a module. If a module was there then not anymore, it will probably cause problems without resetting the MMI and show up as error when you scan for faults. Remember, the electrical components of this car never actually turn off unless the battery dies or is unplugged. To hard reset the MMI there's info here http://www.audizine.com/forum/showth...how-to-do-this In theory, you should see the startup screen like when you first plugged the battery back in.

I second that also since my nav does not show up but I am sure you could disable it through vag.

[sun_dance]

I've got a gut feeling that the control module associated with your MMI has gone bad. I've seen a number of threads with similar types of issues related to the MMI and bad CM. You can purchase a used CM for a reasonable price of CL and your dealer may need to be involved to remove the CP. But that might do it...good luck and i'll be watching the thread

[steel2040]

I've got a gut feeling that the control module associated with your MMI has gone bad. I've seen a number of threads with similar types of issues related to the MMI and bad CM. You can purchase a used CM for a reasonable price of CL and your dealer may need to be involved to remove the CP. But that might do it...good luck and i'll be watching the thread

But his control Head isnt throwing codes and his optical test said it was good coming in and going out. I still think its something to do with the gateways end or the nav not being there.

I kinda take that back the control panel might be at fault he has always said it never lights up time to see if some one is nice enough to let you borrow a spare to bad your in florida I have one I am selling on ebay and would of let you try it out to see if you need to buy one.

[StangGT5]

Haha yes trust me if I hadnt got a great deal it would be a ghost. I've been trying hard resets since day one with no luck. Here is the results of the "see who's got red light test":
TELE/BLUETOOTH- NO LIGHT
CD PLAYER- LIGHT TO IT
MMI INTERFACE MODULE- LIGHT TO IT
GATEWAY MODULE- LIGHT FROM IT
AMP- NO LIGHT
RADIO- NO LIGHT
DEAD END/NAV- NO LIGHT

Here is the junk in my trunk sort of speak. I assume the navigation, if my car had it, should be in the lower slot and Im guessing thats why Audi just threw a loop connector in place on cars that came without it.
[IMG][/IMG]

Could someone walk me through doing a test with my loop connector? Do I simply replace one module with the loop adapter (leave the module plugged in electrically?) and try to perform a reset each time?

[steel2040]

Have you tried 3 button reset the mmi at all if so does it bring anything up like the optical test? And to make sure I got this right the mmi controls around the shifter are not lighten up at all during any of the test you perform?

[StangGT5]

Correct, the only button lighting up on the console is the E-brake switch. No MMI control buttons are lit up at any time. Pressing the three buttons for a reset does not get any kind of response. I have tried multiple times, even some in angry succession, and nothing happens.

[steel2040]

Man have you tried unplugging your MMI control panel and turning on the car? I am leaning towards the fact you said the blutooth was corssive I wounder if the panel got wet. I know if something got sticky they tend to turn off 3 seconds after being on I wounder if its fried. Unplugging it and turning on the car the rest should turn on for 15-20 seconds befor going into protect mode if I am right.

[StangGT5]

So you're saying unplug the actual control panel in the console? I could try that to see if the screen at least comes on.

[steel2040]

I know when they start to go the system turns on and off randomly and if they are really messed up I could see them telling to go into protect mode quickly. When you did the optical test you said the system came on for a few seconds that means it works and that it has to be one of the componets that is shutting it down; the buttons are the only things I can think of and they tend to get wet alot.

[StangGT5]

I suppose that would make sense, it does act as sort of a brain for the system. I'll pull it today and get back with the results.

[StangGT5]

I pulled the control panel and unplugged it with the key off. I turned the key on and the screen did not come on.

[StangGT5]

UPDATE: Im retarded, I didnt plug the panel back in, just the emergency brake. After plugging the control panel back in, the screen came on reading "Audi MMI" for about 15-30 secs then went off. I pressed the 3 buttons to reboot and sure enough, the screen came back on and did the same thing. I waited and did it a 3rd time, the screen did the same thing. I suppose thats progress.

[FormulaElement]

Any updates?? Did you have anything bypassed when the MMI splash screen came on?

Not sure how you could have a car without music!

[Cobra357]

I had a similar issue but it work when I place Audi updated CD in the cd player.

[AdamVanLewen]

Any progress since then? I just bought an '08 A6 Avant with nav and all of the other goodies. It's the main reason I bought the car. However, before selling the car to me, the dealership replaced the bluetooth module. Can this be the cause of my MMI to act up? It is intermittent, the buttons work rarely. Otherwise, it's unresponsive. It'll play the radio and I'll have to change the station from the steering wheel. I have an appointment at the dealer for them to look over it because they were the last ones to fiddle with anything. I've only had the car two days.

[SinCityA6]

Any progress since then? I just bought an '08 A6 Avant with nav and all of the other goodies. It's the main reason I bought the car. However, before selling the car to me, the dealership replaced the bluetooth module. Can this be the cause of my MMI to act up? It is intermittent, the buttons work rarely. Otherwise, it's unresponsive. It'll play the radio and I'll have to change the station from the steering wheel. I have an appointment at the dealer for them to look over it because they were the last ones to fiddle with anything. I've only had the car two days.

If everything works (bluetooth, nav, radio, etc) then the issue sounds to be located in the MMI control unit itself. It is spossible it has been exposed to liquid; often occurs because of its location in front of the cup holder. Did you buy the car from an Audi dealership? I would take the car back and show them the issue and get them to fully diagnose and replace any malfunctionng parts.

[AdamVanLewen]

Oh, I apologize. I forgot to mention that it only works when I first start the car. The buttons will work for a few minutes, then stop working. The radio can be changed from the steering wheel, but everything is frozen. During the drive or the next time I turn the car on it will immediately shut off. I'm wondering if anyone has had a fix for this issue. I just bought the car, I'd go mad if I had to put another $1000 or $1,500 into the damn thing.

[AdamVanLewen]

Can a bad replacement of the bluetooth module cause this? The last thing the dealer did before selling the car to me was replace the bluetooth module. They (ever so generously) said they'll run a free diagnostic test. I hope it's their fault. That's a $15,000 pain in my ass if not. The problem is that my appointment isn't until March 3rd and I can only get a RWD Mercedes C Class as a loaner. I've never wanted a Mercedes, they're basic trash. Gah.

[AdamVanLewen]

Audi had figured it out. When they replaced the bluetooth module, the programming wasn't done correctly (or something to that effect.) Now they just have to reprogram the MMI and it should work. Thankfully they're covering all of it. If I had pay for it, I'd kill myself.