If it isn't the CCU, or the keys, what else could it be?

KneesUp

KneesUp

A2OC Donor
Dear Gurus,

I have dead central locking, despite having two fine keys with fresh batteries. At least, I assume both keys are still fine, as neither will 'talk' to my car, and both packed up at the same time. Would be odd if they did that at the same time!

The problem started progressively, me finding that if I didn't use the car few a few days, the remote action wouldn't work: so I had to use the keys manually in the door lock to open and close the car. All the central locking would work fine then, as would the car alarm, all be it in an inconsistent way (ie slightly different symptoms re front-rear locking etc etc when I put the key in the ignition to dis-engage the alarm).

Apart from the boot lock, which has not worked on my car via the remote for years (it does using the main door lock function button), everything else CCU-governed works fine.

Then... it got worse and worse until the remote Central Locking packed up all together.

I have had Audi dealers diagnose twice, and both simply say that they keys can't find the CCU and that the CCU is probably faulty but they can't be sure on the message code they're getting.

So... I got onto the ever-helpful Lau and followed his instructions. I pulled out the CCU, broke it open, identified the Motorola chip, and gave Lau the part number. He has told me that the part number is for the improved chip, and that discounts all the usual CCU problems with my particular unit (and there are 5 variants on A2s).

Short of just swopping my CCU with someone else's (not easy), I can't figure out how else to localise the problem.

So... the question: if it isn't the CCU, or the keys, what else could it be?

Many thanks, gurus, as ever.

Richard
 
Have you had the car scanned for faults by anyone other than Audi (who are not the best at diagnosis, because of their rigid systems)? If not, then try this and also try having the keys re-synced with the CCCU.

Cheers,
Mike
 
Thanks, Mike, as ever. Much appreciated. Actually three independent specialists have tackled it. One an Audi specialsit; one an electrics specialist, and one with general diagnostics kit. Never Audi. The key re-syncing isn't possible. The CCU can detect the keys but won't actually 'talk' to them. Apparently. There is no fault code reported.

Skipton01 said:
Have you had the car scanned for faults by anyone other than Audi (who are not the best at diagnosis, because of their rigid systems)? If not, then try this and also try having the keys re-synced with the CCCU.

Cheers,
Mike
Click to expand...
 
Well, unless 2 keys have gone duff independently at the same time, then it has to be the CCCU. A simple test of this can be done at a social if someone has VCDS and there's some other A2 keys around.

Basically, a CCCU can be paired to any remote fob (there's actually 2 basic types of CCCU: one sort up to around 2003, the other is 2003 onwards). So, find someone with an A2 of similar year to yours and then see if you can match their key to your car, or vice versa. This will rule the fobs in or out as the cause. However, I suspect the CCCU to be honest, regardless of whether the chip inside is the updated version or not.

Cheers,

MIke
 
Mike,

I much appreciate the time you've taken on this. Lau, incidentally, has been very generous with his time, too. Top people both. Richard
 
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