audi4audi

I have been unable to code my MFSW on my 2003 A6 4.2 to work properly with BT, etc. So I looked at the fault codes and found a 01305 - Databus for infotainment - 80-00-Single-Wire operation.

I clear the code, but it keeps on coming back.

Questions:

1) Would this error prevent me from "coding" the steering wheel?

2) How to correct this error? Do I start looking for bad connections at the MFSW controller?

3) Can any other device on the CAN Bus cause this error to show up in the MFSW controller. (I just installed a PCCM MA-BOX on the bus.

Any help would be appreciated.

Thanks

Lino
'03 A6 4.2

audi4audi

Perhaps a list of all my fault codes will help?

I have the Ross-Tech KII-USB interface.

Thanks.

Wednesday,10,June,2009,19:33:53:47132
VCDS Version: Release 805.4
Data version: 20090602



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


Chassis Type: 4B - Audi A6 C5
Scan: 01 02 03 06 08 15 16 17 18 34 35 36 37 45 55 56 57 65 67 75
76 77

VIN: WAUML64B73N086337 Mileage: 86670km/53854miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: None
Part No: 4D0 907 560 CL
Component: 4.2L V8/5V G 0001
Coding: 07752
Shop #: WSC 02325
WAUML64B73N086337 AUZ7Z0B2290125

2 Faults Found:
17983 - Right Engine Mount Solenoid Valve (N145): Short to Plus
P1575 - 35-00 - -
16825 - EVAP Emission Control Sys: Incorrect Flow
P0441 - 35-00 - -
Readiness: 0010 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01L-927-156.lbl
Part No: 4B0 927 156 FG
Component: AG5 01L 4.2l5V USA 1014
Coding: 01002
Shop #: WSC 02325

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 4B0-614-517.lbl
Part No: 4B0 614 517 R
Component: ABS/ESP allrad 2330
Coding: 06397
Shop #: WSC 02325

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: Redir Fail!
Part No: 4B0 820 043 AM
Component: A6-Klimavollautomat 0105
Coding: 00000
Shop #: WSC 93030

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags Labels: None
Part No: 4B0 959 655 Q
Component: Airbag 8.4EP 2001
Coding: 0000607
Shop #: WSC 02325 785 00200

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 4B0-907-487.lbl
Part No: 4B0 907 487 F
Component: Lenkradelektronik D01
Coding: 01005
Shop #: WSC 02325

1 Fault Found:
01305 - Databus for Infotainment
80-00 - Single-Wire Operation

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 4B0-920-xxx-17.lbl
Part No: 4B0 920 933 S
Component: KOMBI+WEGFAHRS. VDO D12
Coding: 03383
Shop #: WSC 93078
WAUML64B73N086337 AUZ7Z0B2290125

No fault code found.

-------------------------------------------------------------------------------
Address 35: Centr. Locks Labels: 4B0-962-258.lbl
Part No: 4B0 962 258 M
Component: Central Lock/Alarm D37
Coding: 15885
Shop #: WSC 93030

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No: 4B0 959 760 B
Component: Sitzmemory R1 F 0102
Coding: 00001
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation Labels: 8E0-035-192-RNSE.lbl
Part No SW: 4B0 035 192 P HW: 4B0 035 192 P
Component: RNS-E US3 H54 0200
Revision: 08S Serial number: AUZBZ7E0500110
Coding: 0509615
Shop #: WSC 00000 781 01234

1 Fault Found:
01044 - Control Module Incorrectly Coded
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 7
Fault Frequency: 1
Reset counter: 33
Time Indication: 0
Date: 2009.06.10
Time: 19:11:32


-------------------------------------------------------------------------------
Address 55: Xenon Range Labels: 4Z7-907-357.lbl
Part No: 4Z7 907 357
Component: dynamische LWR D09
Coding: 00050
Shop #: WSC 02325

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio Labels: 8E0-035-192-RNSE.lbl
Part No SW: 4B0 035 192 P HW: 4B0 035 192 P
Component: RNS-E US3 H54 0200
Revision: 08S Serial number: AUZBZ7E0500110
Coding: 0509615
Shop #: WSC 00000 781 01234

1 Fault Found:
01044 - Control Module Incorrectly Coded
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 7
Fault Frequency: 1
Reset counter: 33
Time Indication: 0
Date: 2009.06.10
Time: 19:11:32


-------------------------------------------------------------------------------
Address 77: Telephone Labels: 8P0-862-335.lbl
Part No SW: 8P0 862 335 T HW: 8P0 862 335 T
Component: FSE_256x BT H34 0550
Revision: 00000000 Serial number: 00000005015493
Coding: 0011877
Shop #: WSC 00000 000 00000

No fault code found.

End ---------------------------------------------------------------------

audi4audi

Just one more comment:

Of course, I would like to get rid of my fault code on the MFSW (previous posts). However I realized now that the reason I could not code the MFSW with VAG-COM was because I was trying values not supported by the controller. It does code fine if I use supported values. Currently coded 00005. This on a '03 A6 4.2L.

Also, I should mention that everything seems to be working fine. I just find the message annoying. Does CANBUS run on a sinle-wire? I will assume it does as all seems to be functioning as per the manual.

Cheers

Lino
'03 A6 4.2L

bearthebruce

CAN bus is a 2 wire system. There is a CAN HI and CAN Lo wire. If one is broken, there is a reduced performance mode initiated and communication can still occur using a slower speed on one wire. I believe the controller is "ragging" that it can only perform on a single wire for some reason.

This could be as a result of a bad connection, a short to ground somewhere in the harness, a component failure on a device connected to the bus and so on.

It is one of those problems that can only be resolved by following a wiring diagram.

audi4audi

Thanks Bruce.

I was focusing on MFSW controller, but since you suggested other components could be causing the fault, I unplugged the multimedia device (PCCM MA-BOX) and the fault went away.

What's puzzling is that all seems to work well regardless, but probably with a lot of collisions on the bus while the error manifests itself.

Would a device (in this case my multimedia device) work if the CAN high and low were switched?

Thanks for your help. It helped me move my focus away from the MFSW and find the problem.

Lino
'03 A6 4.2L

bearthebruce

I don't think you can reverse CAN HI and CAN LO. When CAN HI drives high, simultaneously CAN Lo drives low if memory serves. Reversing the leads would present the wrong levels to the receivers and would not allow proper communication. If you really want to study what goes on in a CAN system, you may want to look at Wikipedia's page on Controller Area Networks http://en.wikipedia.org/wiki/Controller_Area_Network

audi4audi

I didn't think so, but then CAN Bus totaly new to me. Thanks for all your help. All's working well. And VAGCOM rocks!

Regards

Lino