Three different ways to recode for battery!??wtf

[flowhigh]

Trying to swap out batteries and finding out how insanely antiquated the process is now on the b8.5. There's three different ways to get to the battery management system in vagcom depending on protocol. Never seen this mentioned on the forum or may have missed it. It's amazing when you try to start up the b8's when the battery is dead. With VCDS I WAS able to get a voltage on the battery of 9.5 opposed to the multi-meter reading of 10.3ish.

Still have to get the serialization business done. What a crazy ordeal for a simple battery swap...

I picked up a duralast H8 since I've had really good experience with it in the extreme colds here and of course there is no visible BEN # or anything that stands out that I can use to make one. This is going to take a while, think I'm going to have to make a number up or just switch appropriate characters and see how it goes.

[jjvwg]

Haven’t had to change the battery on my b8 yet, but from what I’ve seen on here, the easiest thing is to just change a character in your original number. The car just needs to see something different to let it know that a swap had taken place. Try that first.

[flowhigh]

Haven’t had to change the battery on my b8 yet, but from what I’ve seen on here, the easiest thing is to just change a character in your original number. The car just needs to see something different to let it know that a swap had taken place. Try that first.

You're correct. All the diy's on the Az search and the web are a waste of time if you have a non OE battery without a BEM code. At first, I did try to input something of a resemblance of a code based on all the diy's.
Here's the rules that the value follows


[IMG][/IMG]


and here's the actual value with BEM# of the old battery stored





I tried these codes that I made up using what part # on the duralast battery and some of the explanations found on the forums, including AZ to no avail. The battery information/replacement does seem to follow a rule with battery replacement value.

00000H8DLG JCB 170112WTF1

00000H8DLG JCB 170112RVW5


So ultimately, I just used the old value by just replacing "MLA" (Moll brand) with "JCB" (Jonhson Controls - maker of Duralast I believe) and changed the "13", which stands for the year it was made, in the last group of characters with a "17". So the old part # was used and I just changed those two things and it took.


[IMG][/IMG]


Of course I did pull a plethora of codes due to the failing battery, but I apparently was in power management mode starting earlier this week after the first time the battery failed - did end up starting that one last time after. There was no real warning to the dying except I did notice a slightly slower crank and wrote it off as the weather and being flexfuel E85. I did pull this code triggered this past Thursday. I can't say there was anything that I noticed driving while in power management mode either.

03041 - Energy Management Active 
            000 -  -  - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 7
                    Fault Frequency: 7
                    Reset cou  ....yada,yada,yada......

Note: To get this done I had to go to electronics 1 \ 19 - CAN gateway \ Long adaptation as listed on the header of the final window in VCDS. Just to reiterate, this could be a different route to take depending on if you have a different protocol. Not sure if this is a regional thing with A4's or a yearly. This path was different than anything I saw on the web. Could be due to the later VCDS version too? Not sure if this can be done with a conventional scanner or something like carrista. I have the premium plus, basic radio MMI (no joystick near shifter) so I don't have the battery option on my MMI. I could see the battery charging with VCDS to 14+v with the motor on/battery with load. From 12 v to 14 v it only took a several minutes at idle. Still curious if it was even necessary to change the value and if I would've exited power management mode automatically

[Novarider]

All you had to do was change 1 number in the serial number. No need to change brand etc.

[flowhigh]

All you had to do was change 1 number in the serial number. No need to change brand etc.

Instead I changed two numbers and the brand, suffice to say that is the obvious now after going through the process myself.

The question is if it was even necessary change the value and would the ecu have adapted to the fully charged battery after a number of cycles. Otherwise everyone this happens to is relegated to taking it to the dealer or shop, that or buying vcds to get this done. I have to believe that an adaptation would occur.

[jfo]

It's difficult to find any detail or factual information about how the BEM system works or what info it extracts and uses from the BEM code. It's clear that changing one or more of the numbers in the existing code will cause the system to recognize a new battery is there. What isn't clear are the questions about adapting over time, learning the new capacity, are there different charging profiles for different types of batteries(AGM,vs flooded), etc.

I just changed mine with a similar capacity and type aftermarket, altering just the date code that was part of the original serial number. It updated in VCDS successfully, but I'm not sure about the amp hr reading...it's much lower than the new battery rating.....60AH vs 92AH rating.
Interestingly, the current Audi battery for my car no longer comes with a BEM sticker. It's a Varta and is identical in terms of original specs but has an updated part number. The only codes/stickers on the new battery are for the part number. I checked it with my QR code reader and it's just the part number. The tech just scans this apparently and their system updates the software. My contact didn't know what changes within the BEM system or what info is gathered other than the part number.
My dealer is quite helpful and I'll see if they can shed any light on this.

[Spawne32]

All changing the coding does is reset the battery life meter, but the system it self can do that when it detects a change in the battery. OBDeleven is by far the cheapest tool to use to do this.

[jfo]

All changing the coding does is reset the battery life meter, but the system it self can do that when it detects a change in the battery. OBDeleven is by far the cheapest tool to use to do this.

That's the thing though....what does "reset the battery life timer " mean, and how do you know this? With respect, there are lot's of opinions out there but no facts.

[flowhigh]

I just changed mine with a similar capacity and type aftermarket, altering just the date code that was part of the original serial number. It updated in VCDS successfully, but I'm not sure about the amp hr reading...it's much lower than the new battery rating.....60AH vs 92AH rating.

If you have a battery control module that's UDS protocol you're required to input the Ah. It's a bit different than the can.

[jfo]

If you have a battery control module that's UDS protocol you're required to input the Ah. It's a bit different than the can.

I noticed that during my reading. Mine is the CAN interface. Forum members have been asking about this for years and it will no doubt continue to pop up. The earliest thread I saved was 2011. So far, I haven't read about anyone having an issue with their battery after just altering the code.

[flowhigh]

I noticed that during my reading. Mine is the CAN interface. Forum members have been asking about this for years and it will no doubt continue to pop up. The earliest thread I saved was 2011. So far, I haven't read about anyone having an issue with their battery after just altering the code.

I think we have the same year and cpma motor if I remember so that makes sense.

Question, do you recall if in vcds your engine module, label 1 is CAN or UDS? Mine is UDS; reason I ask is I was wondering if once you go to that controller if "measuring blocks" is greyed out.

[Gunnark100]

No, gate mvb-s are not greyed out, if memory correct batt spec you see under 17!
Measured value block 017:
Battery identified (OK / not OK)
OK = Adapted battery known
not OK = Adaption value not known
Battery manufacturer (0-7)
Battery size (0-15)
Battery recognition (yes / no)
yes = Battery disconnected, no = Battery connected

[flowhigh]

No, gate mvb-s are not greyed out, if memory correct batt spec you see under 17!
Measured value.....

Oh, Ok cool. You don't remember what protocol your engine control module is, CAN or UDS? It says in the upper left hand corner of the window once you get into the controller.

Also, what year is your B8.5 (looks like in your avatar)?

No worries if you don' t know.

[jfo]

I think we have the same year and cpma motor if I remember so that makes sense.

Question, do you recall if in vcds your engine module, label 1 is CAN or UDS? Mine is UDS; reason I ask is I was wondering if once you go to that controller if "measuring blocks" is greyed out.

Mine is 2011..CAEB engine. Yes, I see that some modules are UDS and some are CAN. In Engine -1, it's UDS and measuring blocks- 08 is greyed out. The same for Trans -2. In CAN-19 where the battery blocks are located, it's not greyed out but some other buttons are.

[flowhigh]

This is weird. I didn't notice this until this week. Isn't like this on my b7....hmmm

[Gunnark100]

My car is B8, way older then yours:) and it does not matter uds or can, if blocks are "sleepers" you can always use adv measure values(but gate should be can protocol, no asam data is in use, regardles b8 or 8.5).

[flowhigh]

Mine is 2011..CAEB engine. Yes, I see that some modules are UDS and some are CAN. In Engine -1, it's UDS and measuring blocks- 08 is greyed out. The same for Trans -2. In CAN-19 where the battery blocks are located, it's not greyed out but some other buttons are.

I haven't delved much with vcds on the b8.5 since I haven't had it that long. A lot of my experience with vcds might be useless cuz I do see a lot of differences.

My car is B8, way older then yours:) and it does not matter uds or can, if blocks are "sleepers" you can always use adv measure values(but gate should be can protocol, no asam data is in use, regardles b8 or 8.5).

Funny you should say that, yesterday I went into advanced measuring values - that isn't greyed out - and I couldn't see simple things like Boost pressure specified and actual. Guess it's an email to Ross-tech and the ol' "do an auto scan and send it to us ". I just never can get a straight answer from them, maybe just me.