2008 Audi A5 Tail Light Coding (BCM2), Factory Lights

[aerodave]

(Sorry, no current autoscan is available for a few days...see below for why. The car is a 2008 US-spec Audi A5 3.2, MT, with original incandescent tail lights and a recently updated BCM2 v2.0 control module)

TL;DR: What do the first 11 bits of BCM2 channels 195-210 do? Does anyone have them documented somewhere?

Last weekend, with the help of a family member and access to a VAS tool, I replaced the BCM2 module in my 2008 A5 because the old module had a failure in the Advanced Key feature. The box (8K0 907 064 AG) was replaced with a later part revision (8K0 907 064 CS), going from BCM2 v1.1 to BCM2 v2.0. That mostly went well, including getting my keys authorized in the new module. The car locks, unlocks, and starts normally. But the tail lights aren't working quite as expected. Okay, should easy enough to fix that with VCDS. Unfortunately, I left my HEX-CAN cable at my family member's place and won't have it back until the weekend.

I think the controller is treating my lights as RoW lights by default, since using my turn signals makes the outboard reverse bulb flash, instead of the outboard red tail/brake/turn light. Also, putting the car in reverse makes only the inboard reverse lamp come on, instead of both inside and outside white lights. This is likely because I'm using the new module's default adaptation values, whatever they may be. Unfortunately, while I captured the long coding of the old box in an Autoscan, I didn't think to grab a controller map for the old adaptation values (I didn't realize that's how the rear lights were configured).*

So until I get my cable back, while I can only tackle this problem abstractly, I'm trying to understand the schema for these adaptation values and plan how to properly recode the module once I have my cable. And that leads me to my actual question...

rlarsen's posts have been amazingly helpful in helping me figure out most of this. Good examples are here and here.

In that second link, rlarsen posts a table explaining the last 5 bits in each adaptation channel. Awesome! That tells me most of what I need to know. But I'm still curious about the first 11 bits. In his tables, the first 7 or 9 bits are colored green, but I can't seem to find anywhere that those are explained. Somewhere, perhaps on another board, I saw him mention that some of those bits control brightness, but I haven't been able to uncover any more detail than that. And those first 9 bits are different between the A5 and A4 examples, so I'd like to understand why. I mainly want to be able to construct my own proper coding values and understand why they are what they are.

Now it could be that these are all documented within VCDS software and I'll find out this question is moot when I get my cable back in a few days. I know a lot of adaptation channels have tooltips for calculating values. But maybe the cheatsheet isn't in the proram, and while I'm waiting around with too much time to think about it, I'm trying to understand as much as I can now.

(*I could resinstall my old BCM module just to get the adaptation values, but I can't risk putting all the car's controllers in Component Protection, as I'm far away from my inside connection, so not in a position to clear it out without a trip to the dealer. And I don't know that putting the new module back in would clear the CP for any boxes that did get tripped. For the same reason, SVM is not a current option...though paying the local dealer for SVM is my fallback plan if I run into unresolvable issues)

 

[Dana]

Hi Dave,

I took a look at your scans in our Support mail and

Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
   Part No SW: 8K0 907 064 AG    HW: 8K0 907 064 AG
   Component: BCM2 1.1      H71 0134  
   Revision: 00002001    
   Coding: 0F0000
   Shop #: WSC 06325 000 00000
   VCID: 75EA2739DC2FB2E7B2-8020

   Subsystem 1 - Part No SW: 8T0 959 754 G    HW: 8T0 959 754 G
   Component: FBSAUDIB8 IDG  H35 0052 
   Serial number: 0508000000370013    

   Subsystem 2 - Part No SW: 8K0 905 852 C    HW: 8K0 905 852 C
   Component: ELVAUDIB8  H35 0039 
   Serial number: 0208000006105001    

No fault code found.
-------------
Address 46: Central Conv. (J393)       Labels:. 8K0-907-064-46.clb
   Part No SW: 8K0 907 064 AG    HW: 8K0 907 064 AG
   Component: BCM2 1.1      H71 0134  
   Revision: 00002001    Serial number: 0108873608    
   Coding: 01060E9A007A44C500B000
   Shop #: WSC 03163 444 83280
   VCID: 75EA2739DC2FB2E7B2-8020

   Subsystem 1 - Part No SW: 8K0 959 719     HW: 8K0 959 719 
   Component: GTO BF  H06 0040 
   Serial number: 00000000000000015552

   Subsystem 2 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HO  H03 1301 

   Subsystem 3 - Part No SW: 8R0 959 591     HW: 8R0 959 591 
   Component: J245EE16SKB09  H01 0170 
   Serial number: 0123456789ABCDEFGHIJ

No fault code found.

was replaced with:

Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
   Part No SW: 8K0 907 064 CS    HW: 8K0 907 064 CS
   Component: BCM2 2.0      H08 0437  
   Revision: 00002001    
   Coding: 0F0000
   Shop #: WSC 12345 123 12345
   VCID: 83461E3F02E2EA5708-80D6

   Subsystem 1 - Part No SW: 8K0 905 852 C    HW: 8K0 905 852 C
   Component: ELVAUDIB8  H35 0039 
   Serial number: 0208000006105001    

No fault code found.
-------------
Address 46: Central Conv. (J393)       Labels:. 8K0-907-064-46.clb
   Part No SW: 8K0 907 064 CS    HW: 8K0 907 064 CS
   Component: BCM2 2.0      H08 0437  
   Revision: 00002001    Serial number: 0469186415    
   Coding: 01060E9A107A44C500B0000000000000
   Shop #: WSC 12345 123 12345
   VCID: 83461E3F02E2EA5708-80D6

   Subsystem 1 - Part No SW: 8K0 959 719     HW: 8K0 959 719 
   Component: GTO BF  H06 0040 
   Serial number: 00000000000000015552

   Subsystem 2 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HO  H03 1301 

   Subsystem 3 - Part No SW: 8R0 959 591     HW: 8R0 959 591 
   Component: J245EE16SKB09  H01 0170 
   Serial number: 0123456789ABCDEFGHIJ

No fault code found.

Reconnecting the original BCM2 so you can save an Adp function map using SA code 16017 will cause a CP DTC but I'm not entirely sure if that will resolve itself after reconnecting the matched replacement unit. I would ASSume the CP DTCs will clear after reinstalling the matched replacement unit .. but this is the Immo so hopefully someone else can confirm. Either way, posting the Auto-Scans and Adp function map from 8K0 907 064 CS using SA 16017 here couldn't hurt.

Next, I typically search our forum for SA code "16017" and rummage through the various posts from rlarsen when looking for B8/MLB based tail light info but Audi doesn't have any official documentation that I'm aware of. I know NAR Audi dealers have needed to replace BCM2s when those channels are incorrectly configured because the actual/specified test plans don't configure them. Although it is possible that's changed using a newer version of ODIS ... it may still be the case.

It may not be of much help but there's a 2009 A5 3.0 TDi CCWA RoW map in this post that you could compare with the settings currently stored in yours. I'll report back if I can locate a factory condition map from a pre-facelift NAR A5.

 

[aerodave]

Just to follow up on this post (and thanks, Dana, for the reply):

I have recoded the tail lights, and they work as they should. The codes I put are one of the right answers for my pre-facelift NAR A5. I say "one of the right answers" because I still don't have a sense for what the first 11 bits of those adaptation values are doing. And multiple values for those bits seem to have the same effect. For example, Ch 197 could be 14984 as I've done it (based on a RoW A5 with incandescent lights) or 51208 as some cars have, or 5128, and it seems to behave the same since all end in "...01000" binary. Maybe those first bits don't matter much for pre-LED cars. But I'd still like to understand what they do.

Dana posted the relevant autoscan parts above, and I'm including the Adp function map for everyone's potential reference. I'll put the whole module's map (with security code 16017) below, even though it's far more than just the tail-light specific channels. I don't post this in the reference section because I don't consider this to be a relevant scan of a factory, non-broken part.


Also regarding the last part of Dana's post, I'd love some kind of confirmation from anyone who knows what to expect if I were to try temporarily putting my old controller back in to map its adaptation values. No doubt Component Protection would kick in, locking out my instrument cluster and everything else. But would putting the new module back in restore the status of al the CP-tripped components? Or would it stay in a state where only a VAS tool could remove the CP? Maybe someone has dealt with something similar out there.

Thanks for the help...

;SW:8K0-907-064-CS   HW:8K0-907-064-CS ---  Central Conv. --- SA: 16017
;Component:BCM2 2.0      H08 0437, Coding:
;Tuesday,25,June,2019,19:08:19:63346
;VCDS Version: Release 19.6.0 (x64)  Data version: 20190529 DS308.0
;VCID: 83461E3F02E2EA5708-80D6

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A228,0,
;51400
A228,1,
;N/A
A228,2,
;N/A
A228,3,
;N/A
A228,4,
;N/A
;
A229,0,
;51400
A229,1,
;N/A
A229,2,
;N/A
A229,3,
;N/A
A229,4,
;N/A
;
A230,0,
;2738
A230,1,
;N/A
A230,2,
;N/A
A230,3,
;N/A
A230,4,
;N/A
;
A231,0,
;2739
A231,1,
;N/A
A231,2,
;N/A
A231,3,
;N/A
A231,4,
;N/A
;
A232,0,
;2740
A232,1,
;N/A
A232,2,
;N/A
A232,3,
;N/A
A232,4,
;N/A
;
A233,0,
;2741
A233,1,
;N/A
A233,2,
;N/A
A233,3,
;N/A
A233,4,
;N/A
;
A234,0,
;0
A234,1,
;N/A
A234,2,
;N/A
A234,3,
;N/A
A234,4,
;N/A
;
A235,0,
;0
A235,1,
;N/A
A235,2,
;N/A
A235,3,
;N/A
A235,4,
;N/A
;
A236,0,
;0
A236,1,
;N/A
A236,2,
;N/A
A236,3,
;N/A
A236,4,
;N/A
;
A237,0,
;0
A237,1,
;N/A
A237,2,
;N/A
A237,3,
;N/A
A237,4,
;N/A
;
A238,0,
;2736
A238,1,
;N/A
A238,2,
;N/A
A238,3,
;N/A
A238,4,
;N/A
;
A239,0,
;2737
A239,1,
;N/A
A239,2,
;N/A
A239,3,
;N/A
A239,4,
;N/A
;
A240,0,
;1518
A240,1,
;N/A
A240,2,
;N/A
A240,3,
;N/A
A240,4,
;N/A
;
A241,0,
;1519
A241,1,
;N/A
A241,2,
;N/A
A241,3,
;N/A
A241,4,
;N/A
;
A242,0,
;1501
A242,1,
;N/A
A242,2,
;N/A
A242,3,
;N/A
A242,4,
;N/A
;
A243,0,
;1505
A243,1,
;N/A
A243,2,
;N/A
A243,3,
;N/A
A243,4,
;N/A
;
A244,0,
;0
A244,1,
;N/A
A244,2,
;N/A
A244,3,
;N/A
A244,4,
;N/A
;
A245,0,
;0
A245,1,
;N/A
A245,2,
;N/A
A245,3,
;N/A
A245,4,
;N/A
;
A246,0,
;1504
A246,1,
;N/A
A246,2,
;N/A
A246,3,
;N/A
A246,4,
;N/A
;
A247,0,
;1503
A247,1,
;N/A
A247,2,
;N/A
A247,3,
;N/A
A247,4,
;N/A
;248 N/A
;249 N/A
;250 N/A
;251 N/A
;252 N/A
;253 N/A
;254 N/A
;255 N/A