Radio works, CD works, No sound. MOST Bus?

[Kev85]

Hello!
I have a problem with my sound system
Audi A6 2.4 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

[markaz]

Are you able to scan your car with VCDS?

[Kev85]

On the paper from the workshop it says, no communication with MMI
Faultcode on the optical bus
Coding not possible


Errors in MMI, Device: Interfacebox
0412, 00a HU not coded
0525, 04 Cluster ctrl
0824, 05a CompProt no co
082F, 00a ComProt active

[B5NUT]

Looks like Component Protection is active, you will need to get that removed by an Audi dealer, then you will get sound.

[Kev85]

It has been to the audi dealer, can it be that they cant erase it due to a faulty unit?

[B5NUT]

Then the only option is to get the part number off the current unit and have a look on ebay for a replacement. When you fit the replacement unit component protection will be active on the replacement so will require a trip to the dealer.

[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.
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