HELP!Convenience unit (ccu) can not be repaired 433ac

From my understanding - and I'll confirm this with Slava / Lau - there is an issue when going from 4 eFH to 2 in that there is hardware missing.

When you say "it won't keep settings", I presume you mean bank 61; did you try changing anything else? If you changed another of the lock settings, would that also be kept? It's possible that it refuses to save bank 61 if certain hardware is not available / there's some physical or software switch which says "you can't change this, as there's no hardware here". I have asked on the German forum for confirmation of this and not really got it yet.

- Bret
 
Not sure if this helps, but Terry travelled to me yesterday in the hope another CCCU would resolve this issue.

Unfortunately it was not possible to verify the suffix of the original CCCU as it is still in the post.

I installed my spare "Q" unit, coded it accordingly and adapted channel 61 for manual rear windows.

All worked fine, proving a fault with the original CCCU (correctly identified by Timmus).

Unfortunately Terry's CCCU is obviously a newer version, so his keys couldn't be matched to the Q CCCU.
When Terry gets the CCCU back from Lau he will ship it to me for repair.

It was good to catch up with Terry yesterday……and it got me out of preparing the vegetables….bonus.

Cheers

Jeff
 
bretti_kivi said:
From my understanding - and I'll confirm this with Slava / Lau - there is an issue when going from 4 eFH to 2 in that there is hardware missing.

When you say "it won't keep settings", I presume you mean bank 61; did you try changing anything else? If you changed another of the lock settings, would that also be kept? It's possible that it refuses to save bank 61 if certain hardware is not available / there's some physical or software switch which says "you can't change this, as there's no hardware here". I have asked on the German forum for confirmation of this and not really got it yet.

- Bret
Click to expand...

Yes, I mean Bank 61. Yes, I also tried changing a few other bits and pieces (such as beep-on-lock), with the same issue.

There is nothing to stop the changing of value on channel 61, whether hardware is present or not. Besides, there is no hardware missing. The CCCU was connected to the rear locks through the door control module via CAN, and it's now connected to the rear locks directly, using the proprietary link of CCCU connector 2 + six pins at connector 4.

bretti_kivi said:
Stupid question: did you swap the CCCUs at the same time? If not, why not?
Click to expand...

I'm not sure what you mean here. As mentioned in my previous post, swapping rear window mechanisms does not require the swapping of CCCUs. Even if the CCCUs are of the same version, it makes for unnecessary work and coding; remote keys, etc.

It is definitely the CCCU which is at fault. As mentioned previously, I put my own CCCU in this car, adapted it accordingly, and all worked perfectly. There was nothing to stop me making the appropriate adaption to my CCCU, even though it is normally used to controlling my electric rear windows via CAN.

Cheers,

Tom
 
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Mustang-owner said:
Not sure if this helps, but Terry travelled to me yesterday in the hope another CCCU would resolve this issue.

Unfortunately it was not possible to verify the suffix of the original CCCU as it is still in the post.

I installed my spare "Q" unit, coded it accordingly and adapted channel 61 for manual rear windows.

All worked fine, proving a fault with the original CCCU (correctly identified by Timmus).

Unfortunately Terry's CCCU is obviously a newer version, so his keys couldn't be matched to the Q CCCU.
When Terry gets the CCCU back from Lau he will ship it to me for repair.

It was good to catch up with Terry yesterday……and it got me out of preparing the vegetables….bonus.

Cheers

Jeff
Click to expand...

Thanks for the confirmation, Jeff.

Are you able to repair CCCUs?

Cheers,

Tom
 
Hi Tom,

I trust you had a nice time at Tony's?

I have the ability to test the integrity of memory. If the ROM is corrupt I can blow, fit and test a new EEPROM.

So, perhaps I can repair some issues, but it's time consuming so I'd not do it as a job.

Cheers

Jeff
 
Jeff,

Thanks very much for helping Terry to solve this little problem. Did you like my wiring that you saw at the CCCU end of things? :)

I did indeed have a nice time at Tony's. I was travelling between south Wales, London and Cambridge, so went via MK for a catch-up with Tony and his boys. Great hospitality, as usual.

I'll be interested to know how you get on with the dodgy CCCU. It appears to have a problem thus-far rarely encountered. Hopefully you'll be able to work your magic with the little box.

Cheers,

Tom
 
Hi Tom,

It's always good to help out where I can.

It was difficult to see your wiring, as it all looks OEM. Really nice, clean job.
Terry said he’s really happy with the electric windows in his car…….I’m sure he was just rubbing my nose in it.:p

I'm hoping to move forward with this mod myself soon, as I'm in the process of gathering all the bits......I'm not going "buy a donor" route as I'll wait a very long time for the correct door cards, but I am still on the lookout for soul black rear door cards for electric windows with any colour arm rest.

Once the CCCU is with me I'll give the repair my best shot and let you know how it goes.

Cheers

Jeff
 
Jeff,

I suppose the fact that you couldn't spot my wiring is indeed a good thing. I'm pleased Terry is delighted with his car. I remember your (mock) outrage when you found out that I was doing this mod for someone before you'd sorted all your parts. Little did we know then that you'd end up getting involved. Thanks again. :)

I've just sent you an email to jeff@b... by the way.

Cheers,

Tom
 
That's really good additional info, Bret. Thank you. Which CCCUs are therefore not able to work? Do we know whether they're physically different, i.e. lacking the necessary pins / connectors? Has anyone in the UK ever seen such a CCCU? <- Mike Skipton, you're probably a prime candidate to answer this one.

From the German forum -
CCCUs that are able to control the rear door locks themselves (and are therefore suitable for use in cars with manual rear windows) include:

8Z0 959 433 AC
8Z0 959 433 M
8Z0 959 433 N
8Z0 959 433 AH
8Z0 959 433 Q

Cheers,

Tom
 
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I don't know if this has any relevance but I had suspected issues with my CCU and contacted Lau for advice.
My CCU P/n is 8Z0 959 433F and the internal chip is 1J35D. Lau advised this is rom based which is much more stable than the flash based chip p/n 2J74Y in later models, and unlikely to be the issue.

Could the chip type have any bearing on the ability to change features on certain CCUs

Cheers Spike
 
Thanks Spike,

Needless to say, I don't know the answer to the question. When I was trying to code/adapt Terry's dad's CCCU, I used the function in VCDS to test the new value (if a certain value is meaningless or not applicable, the test will fail). All tested ok, but the Save process invariably failed. Therefore it strikes me that compatibility wasn't a problem.

Let's see what progress Jeff makes.

Cheers,

Tom
 
As usual, the thread on the German forum gets updated. And there's then a set of pics showing that at least some CCCUs (in this case, the "K" revision) appear not to have the necessary electronics to deal with locking the rear doors on 2-E-window cars. Thread concerned can be found here: http://www.a2-freun.de/forum/showthread.php?t=38315 and is linked from the previous thread.

- Bret
 
This issue has now been resolved, largely behind the scenes.

CCCU incompatibility was indeed the issue. As stated above, only certain CCCUs are able to control the rear door locks directly.
I have updated my thread - www.a2oc.net/forum/showthread.php?20410 - to include the additional information.

Our community knowledge where this mod is concerned would now appear to be complete. Thanks to all who helped with this, and apologies to those who were inconvenienced.

Cheers,

Tom
 
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Thanks to everyone who helped resolve this issue with CCCU .Especially Tom (make,s a great cup of tea), Jeff (very good bacon rolls) and Ben(sorry for cursing your window) for giving up their time, good to know there so many helpful knowledgeable and friendly people on this forum . Tom you can add 8Z 959 443 AF to the list, that can lock manual rear windows
and Sarge I should have listened to you in the first place.

Cheers Terry
 
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