Kev85

Hello!
I have a problem with my sound system
Audi A5 2.5 2005 year model
MMI Basic Plus
The radio / MMI / CD works but i get no sound from the speakers.

Sometimes when i start the MMI the screen lights up and then goes black and starts again.
I can play cds, i can see the seconds go up.

I have read a bit about the MOST Bus.
I disconnected the optical cable going to the amp
When i turn the ignition on i can see a red light from the optical cable but after a couple of seconds it flashes and then goes out.

Is the red light supposed to light up all the time?
I suspect that their might be a glitch in the optics so thats why it flashes and then goes out. What i have read so far is that the amplifier is the last unit in the ring?
So the next step i thought would be to disconnect CD changer and see how the optics behave when it is disconnected.

This fault has been for 2 years, the workshop hasnt been able to find the problem.
Kind regards
Kevin

snagitseven

Please post in one forum at time. Then, if no replies after a period of time, you can try another forum.

visuar

From what I've read the MOST bus is a ring, so things will stop working when there's a break. Unplugging things would be one way to create such a break, so I'm not surprised the master controller is switching the ring off after a while.

To test which device is responsible you'll need a device which you can see here:
VAG makes their own version of that. Since it's fiber optic the light should always be on in the cable (which you can't normally see, of course).

Kev85

Optical test:
Optical Bus Diagnostic : Standard


Controller Electrical Optical
19-CAN Gateway OK OK
07-Control Head(Std Plus) OK OK
0E-Media Player 1 ERROR ERROR
47-Sound System OK OK
56-Radio ERROR ERROR


Adress Autoscan
Address 07: Control Head Labels: Redir Fail!
Part No SW: 4F0 910 729 J HW: 4F0 035 729 D
Component: MMI Cockpit H35 0040
Revision: C51100DE Serial number: AUZ6Z3E1BD1022
Coding: 0000000
Shop #: WSC 00000 000 00000
VCID: 306B14F3D8E3


Part No: 4F0 910 609 B
Component: Bedienteil MMIC6H07 0010


3 Faults Found:
01042 - Control Module; Not Coded
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 7
Fault Frequency: 254
Time Indication: 0


02084 - Component Protection
005 - No or Incorrect Basic Setting / Adaptation
Freeze Frame:
Fault Status: 01100101
Fault Priority: 5
Fault Frequency: 254
Mileage: 176664 km
Time Indication: 0
Date: 2015.09.23
Time: 00:17:58


02095 - Component Protection Active
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 5
Fault Frequency: 1
Mileage: 179599 km
Time Indication: 0
Date: 2015.12.02
Time: 17:20:28
_______________________________________


Address 0E: Media Player 1 Labels: Redir Fail!
Part No SW: 4F0 910 729 J HW: 4F0 035 729 D
Component: MMI Cockpit H35 0040
Revision: C51100DE Serial number: AUZ6Z3E1BD1022
Coding: 0000000
Shop #: WSC 00000 000 00000
VCID: 306B14F3D8E3


No fault code found.

____________________________
Address 19: CAN Gateway Labels: 4F0-910-468.lbl
Part No SW: 4F0 910 468 A HW: 4F0 907 468 B
Component: Gateway H09 0030
Revision: 09 Serial number: 0800804C110039
Coding: 6DEE73C41B0104
Shop #: WSC 02325 785 00200
VCID: 2759FFAFED2D


2 Faults Found:
00384 - Optical Databus
011 - Open Circuit - Intermittent
Freeze Frame:
Fault Status: 00101011
Fault Priority: 5
Fault Frequency: 1
Reset counter: 231
Mileage: 178941 km
Time Indication: 0
Date: 2015.11.20
Time: 10:02:38


02095 - Component Protection Active
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 1
Fault Frequency: 20
Reset counter: 208
Mileage: 178979 km
Time Indication: 0
Date: 2015.11.21
Time: 19:31:06
__________________________________
Address 47: Sound System Labels: 4F0-910-223-AS.lbl
Part No SW: 4F0 910 223 B HW: 4F0 035 223
Component: Amp.-ASK H09 0270
Revision: 16S00001 Serial number: 01512040055593
Coding: 0000004
Shop #: WSC 02335 785 00200
VCID: 1D35DD47BF71


No fault code found.

_______________________________
Address 56: Radio Labels: Redir Fail!
Part No SW: 4F0 910 729 J HW: 4F0 035 729 D
Component: MMI Cockpit H35 0040
Revision: C51100DE Serial number: AUZ6Z3E1BD1022
Coding: 0000000
Shop #: WSC 00000 000 00000
VCID: 306B14F3D8E3


No fault code found.
__________________________

Kev85

Where can i locate the radio unit?
All i can read is that it is located with the amp but i cant see any other unit except the amp in the left compartment.

The CD player lights up and it is possible to insert and take out cds.
I want to fix the electrical and optical connection before taking the car to the dealers for coding and resetting component protection.

visuar

Easiest might be to buy short time access on Audi's ErWin site (there's one for the U.S. and one for Europe) so you can download all the schematics and "repair" manuals and such for your car. It will tell you exactly where everything is and how to take it apart and put it back together, including the tools required.

Kev85

Thanks, will check it out.
Anybody know what the optical loop looks like?
It feel like it goes gateway - amp - control head - cd player radio.
So because of comp protection on control head signal optical signal doesnt go further.
But would that cause a electrical error also?

Kev85

The radio/media player was replaced. Location in the glovebox.
After this the comp protection alarms got reset by the workshop and now it works.
Thank you for all replies