OEM Remote Central Locking Retrofit

RantA2

RantA2

Member
Finland
Hello,

I tried to ask some instructions some time ago in an already existing thread but had no answers so let's try again with a new thread.

So the case is that I have a A2 1.4 petrol from the year 2000 and it has originally been in demonstration use in a car dealership so it has some odd features missing despite some optional extras.

The car has no remote central locking so I decided to try to retrofit the original remote central locking how it was from factory.

I have already changed my CCCU from 8Z0 959 433 H to 8Z0 959 433 AC which supports remote central locking. I also bought two 8Z0 837 231 D keys which should be compatible with the later CCCU models. The keys are fully working except for the remote control. I could need some help to get the remote control part working.

I read that the pins for the antenna in the CCCU are pins 15 (ground) and 16 (antenna). I bought a 000979018E wire that should work as an antenna but I need some instructions how should the antenna wires be installed. If someone has any tips how should I proceed and photos from the OEM antenna installed it would help a lot.

Here's a photo from my current situation. The 000979018E wire is mounted to the pin 16 in the far left column.

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Afternoon,

I remember this very question coming up recently. Have a read of this thread as it looks to confirm the pinout for the antenna wire.

The OP of the linked thread hasn’t been online since December, maybe this is a good sign that it’s all sorted. Might be worth sending a PM as this member might have notifications set up and should come back to you quickly, just a guess though.

Of note it would be really useful if the membership come back to their threads to inform the community if their issue has been resolved along with how it was done so. This in turn would assist the wider membership to understand to remedy and how best to advise such challenges in the future.

Have you got access VCDS as you can test the key fobs are recognised in channel 46. Have you replaced the remote fob batteries? This thread shows the procedure if these fobs haven’t been syncronised to the CCCU previously.

Someone like Tom @timmus would be the right person to provide the information you need as I guess he might be one of not very many who have completed this retrofit.

This thread may also help to understand the antenna wire. Post #4 by Tom explains that the said antenna wire goes from the CCCU directly to the exterior of the vehicle with no intermediate connectors or module:

2181856C-115A-4A08-B93B-C9AE0B6DAAC8.jpeg


Kind regards,

Tom
 
RantA2 said:
I have already changed my CCCU from 8Z0 959 433 H to 8Z0 959 433 AC which supports remote central locking. I also bought two 8Z0 837 231 D keys which should be compatible with the later CCCU models. The keys are fully working except for the remote control. I could need some help to get the remote control part working.
Click to expand...

You will need to program the CCCU to recognise the remote fobs before they will work. You can do this with VCDS if you have it.

 
Last edited:
There is probably two problems. One the fobs are not coded to the CCCU. The second is that until the aerial matches the single piece to the rear bumper then I doubt the signal would be received or at best the remote would have to be very close to the CCCU.
 
Thanks, I think the first thing is to try coding the fobs again. When I hopefully get that sorted I can atleast test the range and try to install a proper antenna when I know the CCCU recognises the fob signal.
 
RantA2 said:
Thanks, I think the first thing is to try coding the fobs again. When I hopefully get that sorted I can atleast test the range and try to install a proper antenna when I know the CCCU recognises the fob signal.
Click to expand...
Evening,

I think you’ve got pretty much all the information you require on this thread (or links provided) to get this retrofit complete. Please do report back once you’ve plugged in VCDS to finalise things.

Kind regards,

Tom
 
RantA2 said:
I think the first thing is to try coding the fobs again.
Click to expand...

You say again, have the fobs already been paired to your specific CCCU? If they've already been encoded, it's a simple process to resync them - insert the first key into the ignition, switch on the ignition and wait for all the instrument cluster lights to settle. Now, in one continuous action, switch off the ignition, remove the key from the ignition barrel and then immediately press the unlock button on the key fob. The central locking should now respond to that key. Repeat the procedure for the other key.
 
The other circuit board is new but the other is from the same donor vehicle as the CCCU so I guess it has been connected to the CCCU previously.
Although, I went to a locksmith to code the ID chips and they also tried to get the remote control to work but didn't seem to have a clue how to get it done. I got the ID chips coded so I can use the keys but apparently the remote circuit boards aren't connected to the CCCU.
 
Hello again,

You really could do with meeting up with someone with VCDS then follow the how to synchronise remote fobs link mentioned in Post #2.

It seems you’re so close to completing this retrofit but VCDS is the vital ingredient you’re missing right now.

Kind regards,

Tom
 
There is a member in Finland on the Free Scan Register with VCDS who may be able to help. Google maps predicts a two hour drive to meet up but not out of the question if no more convenient alternative exists.

Andy
 
Thanks, I'll keep that in mind. I already found a contact with a HEX-V2 cable so I will try that first.
 
Thank you very much! I already followed some manual instructions without success, but with these I managed to pair the key with the brand new circuit board to the CCCU! I now have the remote central locking working with one key, retrofit completed! 😳😁

The range is also surprisingly long even without a proper antenna installed, at least 30m from the car.

I still need to pair the second key with the old circuit board, but following the manual instructions which worked on the first slot, the second doesn't respond at all. There were some tiny pale traces of possible oxidation on the circuit board so it's possible the circuit board is damaged and I need to replace it to get the key working.
 
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Short summary for anyone trying this retrofit in the future:

1. Buy a new CCCU which supports remote central locking (list of compatible CCCUs can be found on this forum). I bought a newer model with two letters at the end, 8Z0 959 433 AC. Just change the new CCCU in place, no coding needed.

2. Buy new key(s), I bought two 8Z0 837 231 D keys which are compatible with the later model CCCUs (D at the end). I bought the keys from eBay, the seller had new cases, empty ID chips and circuit boards available and sending them a picture of the existing key blade, they cut the blades.

3. Get the keys coded. I went to a locksmith who copied the information from the existing key to the empty ID chips to get the new keys to be able to start the engine and disable the ignition lock.

4. Get the remote control working. Either coding with VCDS or the manual method mentioned in mtl's link in post #13.

5. Retrofit completed.

For me the range is strangely really long already, but installing a proper antenna would probably extend the range. The pins for the antenna are in the far left column on the CCCU, pins 15 (ground) and 16 (antenna).
 
Another bonus with remote locking is if you hold down the unlock button the electric windows lower and if you hold the lock button the electric windows raise. Useful to ventilate the car when approaching it or to close any open window if it starts to rain or snow!

Not sure if your indicators now flash on locking and unlocking nor if your alarm ( if fitted ) chirps but recoding the CCCU will enable this if the hardware is present.
 
Thanks for the tip, although mine does nothing when holding lock/unlock buttons. I guess the function needs to be coded?

The indicators now do flash simultaneously with the central locking sound but my car doesn't have alarm fitted.
 
RantA2 said:
Thanks for the tip, although mine does nothing when holding lock/unlock buttons. I guess the function needs to be coded?

The indicators now do flash simultaneously with the central locking sound but my car doesn't have alarm fitted.
Click to expand...
Are you sure? Because I think that lock/unlock chirp uses alarm horn, so...
Yes, if the windows do nothing, this comfort opening/closing needs to be coded. Have you tried with your key in the doorlock, holding it in the lock/unlock position for a few seconds?
 
I should have been clearer, the indicators flash simultaneously with the mechanical sound of central locking activating, it doesn't chirp or anything and there isn't an alarm fitted from factory.

Trying again holding the buttons down it started working.

I also got the second key working briefly with the manual method but even though it was working the range was only about 2m from the car and the key stopped responding when I opened and reassembled the key. There seems to be some kind of contact disorder between the circuit board and the battery. I think the old circuit board has seen its best days and I can get the problems solved easier just buying a new circuit board.
 
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