Ok peeps, here goes...
A few weeks back I swapped the rear electric windows from Terry's dad's car into Terry's car. You can see what's involved here:
http://www.a2oc.net/forum/showthread.php?20410
The CCCU needs to be adapted such that it knows about the change in handling of the rear door locks.
All went well and Terry's A2 works perfectly with rear electric windows. However, the CCCU in Terry's dad's A2 appeared to be faulty, even though a scan of the unit revealed nothing out of the ordinary. Basically, the problem is that the unit refuses to accept changes to its coding or adaption changes. VCDS tests OK, but when you save the new value, the unit fails to write. So, even though the CCCU performs all its functions flawlessly, it cannot be adapted. As a result, the rear doors don't lock, as the CCCU still thinks it should lock them over CAN, rather than handling the locks itself.
All the wiring and all the locks work perfectly. As a test of my looms, I placed my own CCCU in the car, adapted it correctly, and everythings locked as it should. I then placed the dodgy CCCU in my car and tried adapting it in my car, resulting in the same problem: the CCCU fails to write the new value.
So, I suggested to Terry than he take the car to Audi and get them to do the adaption. If Audi's diagnostic systems couldn't adapt the CCCU, then the fault would be confirmed. I hadn't heard from Terry until this thread appeared, so I can only assume that Audi were unsuccessful and that the CCCU was therefore confirmed as faulty, hence why it was sent to Lau. I don't know why Lau thinks the CCCU's version letter is incorrect for Terry's dad's car. Note that the CCCU
does not move between cars as part of the electric window swap.
- - - - - -
Tomorrow morning I'm going to the Fort William area for the best part of a week as part of my job. I'll have no access to the internet. I hope that what I've written will help others to help Terry whilst I'm away.
Terry: Could you please post the version letter of your dad's CCCU here such that other members with spare CCCUs can assess whether their parts are suitable. - EDIT: Having just read the title of this thread, I'm guessing the faulty CCCU is of the AC version.
Cheers,
Tom