C5 S6 instrument cluster coding problem (NOT IMMO related!)

[gldgti]

Hi all,
In the process of getting verified, bear with me :-). For reference I have a genuine HEX+CAN USB interface purchased about 10 years ago.

I have a 2004 Audi C5 S6 sedan. I bought the car about 5 months ago and noticed immediately after I started driving it that the speedometer seemed to read too fast all the time. The wheels and tyres are standard rolling diameter for the S6 (255/35 R18).

Finally yesterday I got around to checking the instrument cluster coding. The coding is 05783. For my car, that means its coded for "Allroad wheels and tyres" and "80L fuel tank" by having 05 at the start. I have no idea why its coded this way but its obviously wrong, as my car has the standard 70L tank and small wheels (not allroad sized!). I have no other reason to suspect the cluster has been changed in the past either, and it has "S6" in the tachometer.

So, I've tried to recode the module to 00783 just by changing the coding to "00783" and clicking "Do it". The "coding" window closes after I hit "do it", (the window for instrument cluster stays open) communication is maintained but the coding does not change (remains 05783).

My next thought was that I need to "login" to make this coding change.... but I don't actually know if I do need to - if someone could confirm that, it would be good. If I do need to login, is it a generic login or is it the 4 digit SKC? In which case, do I now need to get Vag commander or similar to pull the SKC from the cluster?

Any help would be greatly appreciated!
Aydan

 

[PetrolDave]

Hi, to help we'll need to see a full unedited Auto-Scan made using your HEX+CAN-USB.

 

[gldgti]

and here it is:

Tuesday,24,November,2020,18:22:11:02904
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 20.4.2.0 (x64)
Data version: 20200730 DS317.0
[URL="http://www.Ross-Tech.com"]www.Ross-Tech.com[/URL]


VIN: WAUZZZ4B04N079057   License Plate: CLB50M
Mileage: 201670km-125311mi   Repair Order: 



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


Chassis Type: 4B (4B - Audi A6/S6/RS6/allroad C5 (1998 > 2005))
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
          75 76 77
 
VIN: WAUZZZ4B04N079057   Mileage: 201670km-125311miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: Redir Fail!
   Part No: 4D0 907 560 CJ
   Component: 4.2L V8/5V      G   0003  
   Coding: 05752
   Shop #: WSC 02334  
   VCID: 70E5CD8330A84B06E3-5140
   WAUZZZ4B04N079057     AUZ7Z0A1880591

No fault code found.
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 01L-927-156.lbl
   Part No: 4B0 927 156 ET
   Component: AG5 01L 4.2l5V  RdW 1011  
   Coding: 00001
   Shop #: WSC 00000  
   VCID: 7DFBE4B777FA366E78-5140

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 4B0-614-517.lbl
   Part No: 4B0 614 517 E
   Component: ABS/ESP allrad      3428  
   Coding: 06397
   Shop #: WSC 02334  
   VCID: 234FF2CFB1DEA09E2E-5124

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 4B0-820-043-MY2.lbl
   Part No: 4B0 820 043 AR
   Component: A6-Klimavollautomat 0208  
   Coding: 00001
   Shop #: WSC 00000  
   VCID: 6AD1DFEB1674B1D6AD-2586

3 Faults Found:
01272 - Positioning Motor for Central Flap (V70) 
            41-10 - Blocked or No Voltage - Intermittent
01273 - Fresh Air Blower (V2) 
            17-10 - Control Difference - Intermittent
01592 - Air Quality Sensor (G238) 
            57-00 - Electric Circuit Failure

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4B0-959-655-AI84.lbl
   Part No: 4B0 959 655 AA
   Component: Airbag 8.4EP        1002  
   Coding: 0000706
   Shop #: WSC 02334 785 00200
   VCID: 6FE7CEFF7D9654FEFA-515E

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 4B0-920-xxx-17.lbl
   Part No: 4B0 920 935 C
   Component: KOMBI+WEGFAHRS. VDO D07  
   Coding: 05783
   Shop #: WSC 00258  
   VCID: 254BECD7BFEA5EAE40-5140
   WAUZZZ4B04N079057     AUZ7Z0A1880591

No fault code found.

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 4B0-962-258.clb
   Part No: 4B0 962 258 N
   Component: Zentralverrieg.,DWA D38  
   Coding: 05832
   Shop #: WSC 00010  
   VCID: 346D019304303726C7-4EB2

7 Faults Found:
01374 - Alarm triggered by Terminal 15 
            35-00 - -
01370 - Alarm triggered by Interior Monitoring 
            35-00 - -
01558 - Contact Switch in Locking Cyl; Driver Side; Close (F241) 
            29-00 - Short to Ground
01557 - Contact Switch in Locking Cyl; Driver Side; Open (F241) 
            29-00 - Short to Ground
01561 - Rear left door 
            59-10 - Can't Unlock - Intermittent
01134 - Alarm Horn (H12) 
            49-10 - No Communications - Intermittent
01134 - Alarm Horn (H12) 
            77-00 - Internal Supply Voltage

-------------------------------------------------------------------------------
Address 37: Navigation        Labels: 4B0-035-192-RNSD-37.lbl
   Part No: 4B0 035 192 K
   Component: RNS 4.2 H06    BNO 0140  
   VCID: 254BECD7BFEA5EAE40-4AE8

No fault code found.

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 4B0-951-178.lbl
   Part No: 4B0 951 178 A
   Component: Innenraumueberw.    D04  
   Coding: 00101
   Shop #: WSC 02334  
   VCID: 2649EBDBC2EC55B649-5124

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4Z7-907-357.lbl
   Part No: 4Z7 907 357 
   Component: dynamische LWR       D09  
   Coding: 00050
   Shop #: WSC 02334  
   VCID: 040D9153141047A637-4B1A

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 4B0-035-192-RNSD-56.lbl
   Part No: 4B0 035 192 K
   Component: Radio          BNO 0001  
   Coding: 00017
   Shop #: WSC 00010  
   VCID: 254BECD7BFEA5EAE40-4AE8

No fault code found.

-------------------------------------------------------------------------------
Address 57: TV Tuner        Labels: 4D0-919-146.clb
   Part No: 4D0 919 146 B
   Component: TV Tuner        H10 1206  
   Coding: 0000070
   Shop #: WSC 00000 785 00200
   VCID: 2855E5E398F843C67B-5140

1 Fault Found:
00863 - Antenna 1 for TV (R55) 
            011 - Open Circuit - Intermittent

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 8Z0-919-283.lbl
   Part No: 8Z0 919 283 
   Component: Parkingsyst. A6 RDW D08  
   Coding: 01146
   Shop #: WSC 02334  
   VCID: 0201974B0E04499605-5140

No fault code found.

End-------------------------(Elapsed Time: 05:00)--------------------------

 

[Uwe]

I've never heard of a Login being needed to change a vintage cluster coding. However, it is possible that some combinations are blocked by the cluster's firmware.

I would try changing one bit (in that field) at a time, so try 01783 and 04783 to see what happens.

-Uwe-

 

[gldgti]

***EDITED after spending an hour with the car***

OK, so I tried some other coding options to see if I could get anything to work - I tried 04783 and that worked! I also tried 04883 (area code to rest of world RHD) and 04983 (japan RHD) and both of those worked fine. Changed back to 04783 just fine.
I can change 04 to 05 and back to 04. But the module will not take 01, 02 or 03 for the first 2 digits at all.
This got me thinking if perhaps the cluster "knows" something about how other modules are coded? But looking at the ECU coding 05752, nothing in there suggests allroad to me.
So I've solved the problem of the tank capacity, but not my main issue of the speedometer.
Any thoughts on what else this could be? My only information on what I think the coding should be has been worked backwards from the coding suggestions in VCDS... is it possible its incorrect?

 

[Uwe]

So I've solved the problem of the tank capacity, but not my main issue of the speedometer.

How much off is it?

-Uwe-

 

[_Val]

4B0920935C indeed corresponds to instrument cluster part number for 300km/h "AUS"+S6.
Maybe "04" part is mandatory. You can have 04, 05, 06 or 07, but not less than that.

English version is missing 077-907-559-ANK.CLB label file. German clb can't be used in english vcds, i think.

 

[gldgti]

How much off is it?

-Uwe-

it reads over by about 15-20%....quite a lot really.

Not long after I got the car I swapped the wheels from my allroad onto it for a week, and it "felt" the same as driving my allroad in terms of road speed vs indicated, and when measured against GPS was over reading only by about 6-8% (i.e normal).

Those wheels/tyres are too big though, they fit but you can tell all the extra unsprung weight.

 

[gldgti]

4B0920935C indeed corresponds to instrument cluster part number for 300km/h "AUS"+S6.
Maybe "04" part is mandatory. You can have 04, 05, 06 or 07, but not less than that.

English version is missing 077-907-559-ANK.CLB label file. German clb can't be used in english vcds, i think.

Its s shame this label files is missing in English version. I've seen a few forums posts around the internet frustrated about this problem, although I guess the number of people that it affects is dwindling...

 

[PetrolDave]

it reads over by about 15-20%....quite a lot really.

That's outside the legally allowed limit in the EU (maximum over-read of 10%) so that makes me wonder whether either the wheel/tyre combination fitted is approved for your S6 or someone has been messing with the instruments coding?

Looking at the Ross-Tech Wiki here it looks like your instruments have been coded for an Allroad not an S6 - maybe changing the instruments coding from 05783 to 01783 is worth trying?

 

[gldgti]

That's outside the legally allowed limit in the EU (maximum over-read of 10%) so that makes me wonder whether either the wheel/tyre combination fitted is approved for your S6 or someone has been messing with the instruments coding?

Looking at the Ross-Tech Wiki here it looks like your instruments have been coded for an Allroad not an S6 - maybe changing the instruments coding from 05783 to 01783 is worth trying?

Thanks.... I don't think you read my other posts in this thread :-) That is exactly my issue.

 

[PetrolDave]

One other thought - what have you set the WSC, Importer and Equipment numbers to in your copy of VCDS?

The default is all zeroes which tries to do 'stealth' changes but not all modules will accept that so I'm wondering if it's worth making them the same as one of the modules in your car i.e. 02334 785 00200?

To get to where you change the WSC etc open VCDS (you don't need to be plugged into the car to change these settings), click on Options, then on the "User Interface and Identification" tab. You'll have to restart VCDS for the new values to take, then try changing the coding again.

 

[NEtech]

One guess, could be that the Instrument Coding was changed some time earlier and that it is a one time change only.

Maybe it is possible to change the Instrument Coding to 01783, if you change the mileage to 0 km first, if you have the equipment to do that.
I have not tested if that is possible, but it might be.
Then you can change the mileage back to current mileage.

 

[Uwe]

One other thought - what have you set the WSC, Importer and Equipment numbers to in your copy of VCDS?

Since it accepts other coding changes without that, I am skeptical that this will have any effect.

It is not clear to me why it refuses to accept the non-Allroad coding though.

-Uwe-

 

[Uwe]

Maybe it is possible to change the Instrument Coding to 01783, if you change the mileage to 0 km first, if you have the equipment to do that.

That's a big IF.

-Uwe-

 

[NEtech]

Yes it is , but it sounds important for OP.
Else one could buy a new Instrument or equipment (and knowledge) to change EEPROM value(s).

 

[gldgti]

Thanks for the responses.
I just tried changing the WSC in VCDS settings to 00200 as per suggestion and then re-tired the coding procedure, to no avail. I can still make coding changes as per all the other options, but no value less than 04 for the first two digits.

I now note that the WSC field is greyed out in the settings screen, so does this mean I'm now stuck with 00200 for this cable?

 

[Uwe]

I now note that the WSC field is greyed out in the settings screen, so does this mean I'm now stuck with 00200 for this cable?

No, it's not stored in the cable. Just delete the VCDS.CFG file.

-Uwe-