Key sync issues with having only one key and VDCS use.

I didn't t really understand all the tech regarding key syncing and all that palava but I do know that the transponder has to match the CCCU.
Without reading all the above, is the transponder part of the key, the bit with the blade original to the car and is the CCCU the original for the car even.
 
HI, the bit with the key blade is original to the car and starts it (no imobiliser issues), the original CCCU seems to have gone bad when the seller had battery issues (or probably cuased them). I bought the car "dead" with a constantly drianign battery. I bought a replacement CCCU off ebay but with no key back included as I didn't know that "was a thing", I thought I could just re PAIR and SYNC via VCDS.
 
Remember I said to follow the guide EXACTLY. Well now read it AGAIN, then AGAIN until you are sure you understand what you have done wrong. If keys worked with old CCCU then they are correct frequency. Now print the guide and put a line through each stage as you complete it. Oh and read it AGAIN.
 
Hi @audifan I heave read it several times and repeat it verbatim at bedime and when I get up in the morning.

Key is 433.92mz but like I say I have no way to know if its actually giving out a signal. I might have to text the seller to ask when it last worked and check the key fob battery again)
 
carbore said:
HI, Thanks @Andrew pedantry on terminology is welcome!

Im now stuck though. I tried Birchall's guide and the RossTech approach to no avail. I get all the right menus via module 46, Adaptation, then pick the number of keys but I do notice that the field at the top never says "initialising". Is it supposed to say that when its "listening" for a new key or does it only say initillising when it "hears" a new key.

I ask the above as I only have the one key that came with the car bought with this fault, I have no way of knowing if they key is not damaged or now if they key is actually the wrong frequency. I have changed and tested the battery on the key too.

Another issue is the CCCU "coding" the new CCCU says soft coding is 6859 but the old one was 0185 could that be it.

Im not sure what to try next.

The only good news is the battery drain fault that made the seller "give up" seems to have gone.
Click to expand...
You really need someone who knows about these, not me!

I have not much time now but will return tomorrow if I have suggestions.

I think it would help if you answered...

1. What is the part number of your key(s)?
2. Was the old CCCU a Q version, if not what?
3. Does the car have rear electric windows?

Andy
 
Ill update with all the part numbers tomorrow, however i have gone down a rabbit hole re testing RF remotes and orderd some germanium diodes. This should be a bit of nerd fun
ill report if this does anything interesting.
 
This is the really important bit and where most go wrong....


Enter channel "21" and click on [Read]

This is supposed to display the number of currently stored remotes in "Stored Value". - Mine always displayed "0" as I think all A2s do?

The "New Value" field is used to indicate the POSITION of the key (out of the 4 positions) NOT the number of keys you want to code,
So instead of following the Ross Tech instructions, try this,
You use the "up/down" arrow to move to the position you want the key to be in (of the 4 possible positions) and then (without clicking test or save or anything) press the unlock button on the key that you want to pair into that position (you might have to hold the unlock down a few seconds, but it is normally quite quick), the field near the top right will change from "initialising" to "Recognised" then click on "save".
You have now paired the first key.
Now repeat this for each key you have (changing the position each time) remembering to save after you get the "recognised" message.
 
Hi, still stuck :-(

The diodes I ordered arrived (as per the video) and I can see the key is sending out some RF so thats "good"

I still cant get the key to pair though, I have tried the process described above repeatedly and read it multiple times carefully.
One issue is I never see "initialising" displayed on the screen. After New value = 1 for position 1, dont click anything, dont see it say initilising, press key, nothing happens.

NEW CCCU 8Z0 959 433 AF
OLD CCU 8Z0 959 433 E

Car has rear electric windows

Key part number 8z0 437 231 / 3x5029 24/00

I did check the codes and its saying issues re cant de-safe as per the image.

IMG_2909.jpg


I have tried re coding it to 00185 which was the orical CCCUs, number. I did notice as I look through the images that the shop numbers are different.

Im now totally out of ideas on this one.
 

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Are you getting the same when using either CCCU? Do all the keys start the car normally? Have you checked the frequencies of the remotes? Take a couple of pictures of the remote halves part number and other lettering. Being a 2001 car are you sure that it will accept an AF CCCU as is or does some reprogramming have to be done to it? What has a full VCDS scan shown up?
 
Does this help.

Radio key

Adaptation channel 21 : teach in remote control key (please refer to the section below)

There are at least 2 different FFB types (in the Audi A2) which are not compatible with each other. Comfort control unit and FFB must match.

There are 2 different transmitters for the A2, with the following part numbers:


  • 8Z0 837 231
  • 8Z0 837 231 D

A simple test gives you certainty: Select number 7 in the comfort control unit and in the measured value blocks with VCDS. Now press a button on the FFB. If the value in field 2 ("command radio remote control") changes, this means that the FFB is basically compatible with the comfort control unit and should be able to be taught. It does not matter whether the FFB has already been trained or not.

If nothing happens here, either the FFB is not compatible or the battery of the FFB is empty or the FFB is defective
 
Hi,

I think the cause of your problem has surfaced.

The part number for your key indicates the early version of the two keys used in the A2 production. (The later version is the same part number followed by 'D'). Looking at the German CCCU wiki your former E CCCU is an early version of the CCCU and you now have installed a later AF CCCU. I suspect the original key and new CCCU are incompatible.

If this is resolvable I do not know, you need Tom(Timmus) to comment.

More expense I am afraid, buy a later 'D' key and it will pair first time.

(Did I say CCCUs sold here normally come with keys to avoid this!.)

Andy
 
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HI, Thanks for that research @Andrew I think thats "it" I double check tomorrow, but I think that my CCCU and Key are incompatible, looks like ill keep my eyes out for a later key back. Shame I jumped too soon on getting the CCCU without reading enough info/asking question here. Oh well, you live and learn. Thanks again.
 
If it had been made clear from the start this was a 2001 car whose E CCCU had been replaced with an AF CCCU rather than just could not pair it then I am sure research would have been quicker. If you want a problem diagnosed we need all the relevant information to get the working solution.
 
HI, yes @audifan the original issue was the CCCU was dead when I bought the car a few weeks back (the car was dead on a drive, I trailered it home), iv been on a learning curve with A2s so didn't know that when I get a new CCCU I needed to be mindful of age or get one with key backs.

Still, on a positive note so far Iv done cambelt, service, fixed the rack end that it failed the MOT on and and the new CCCU whilst it doesn't work with the key has fixed the fault that killed the car.

Thanks for the help to you and everyone so far.
 
So when you get the correct remotes for your CCCU then the pairing etc will work. At least you know how to do that. Assuming you have the existing blades and immo chips then they will still work on the later remotes.
 
carbore said:
HI, yes @audifan the original issue was the CCCU was dead when I bought the car a few weeks back (the car was dead on a drive, I trailered it home), iv been on a learning curve with A2s so didn't know that when I get a new CCCU I needed to be mindful of age or get one with key backs.

Still, on a positive note so far Iv done cambelt, service, fixed the rack end that it failed the MOT on and and the new CCCU whilst it doesn't work with the key has fixed the fault that killed the car.

Thanks for the help to you and everyone so far.
Click to expand...
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Andy
 
SUCCESS! I got a job lot of Audi/VW keys for "not a lot" off eBay and once of them was
  • 8Z0 837 231 D
Just programmed it to the car no issues and have a working blipper!.

Thanks to all who helped on my voyage of discovery into the world of A2s.
 
carbore said:
SUCCESS! I got a job lot of Audi/VW keys for "not a lot" off eBay and once of them was
  • 8Z0 837 231 D
Just programmed it to the car no issues and have a working blipper!.

Thanks to all who helped on my voyage of discovery into the world of A2s.
Click to expand...
I'm pleased for you, well done. - Andy
 
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