New arrival..

Well I have had the battery on charge all day, and once it showed charged, I tested the battery. My battery tester says it is at 45% and needs replacing. The charge test said all okay. I had a look through the receipts I got with the car, and the battery was bought on the 17th Jan 2023!! I wouldn't of thought that a battery could be trashed that quickly but maybe it's possible. I'll maybe swap in the other battery for now.

I thought I'd try checking all the fuses with my infra red thermometer. All fuses were at ambient temperature, but the CCCU was 6 degrees above, which seemed strange, so I have removed it. With the CCU connected the drain is 0.47 amps, with it disconnected the drain falls to 0.027 so maybe I am on the right track.

IMG_20240127_174321_HDR.jpg
I seem to remember reading that these early Q ones are not so reliable.. So I'll try swapping my other cars one in tomorrow and see if that works..
 
DaveySprocket said:
Well I have had the battery on charge all day, and once it showed charged, I tested the battery. My battery tester says it is at 45% and needs replacing. The charge test said all okay. I had a look through the receipts I got with the car, and the battery was bought on the 17th Jan 2023!! I wouldn't of thought that a battery could be trashed that quickly but maybe it's possible. I'll maybe swap in the other battery for now.

I thought I'd try checking all the fuses with my infra red thermometer. All fuses were at ambient temperature, but the CCCU was 6 degrees above, which seemed strange, so I have removed it. With the CCU connected the drain is 0.47 amps, with it disconnected the drain falls to 0.027 so maybe I am on the right track.

View attachment 118264
I seem to remember reading that these early Q ones are not so reliable.. So I'll try swapping my other cars one in tomorrow and see if that works..
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The CCU drain can also be high because the CCU does not know the car is locked. This can be down to a dodgy door micro switch not telling the CCU that it's locked.
Mac.
 
PlasticMac said:
The CCU drain can also be high because the CCU does not know the car is locked. This can be down to a dodgy door micro switch not telling the CCU that it's locked.
Mac.
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Interesting.. My key fobs aren't working and rear doors are not locking at all.. I guess switching out the CCU will/should help solve what's going on

I don't really understand exactly how the CCU and Central locking are connected, will have to read more on that. Cheers
 
Interesting indeed. What windows are the rears - manual or electric? Have you any reason to suspect the CCCU has been changed before now? And what windows are in the other car, and which letters on its CCCU?
 
Proghound said:
Interesting indeed. What windows are the rears - manual or electric? Have you any reason to suspect the CCCU has been changed before now? And what windows are in the other car, and which letters on its CCCU?
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Both cars are manual rear windows, the other CCU I have no idea which letters it is. I had never heard of CCU's until the last 48 hours! And no I have no reason to suspect either CCU have ever been changed.

My logic, based on what I think is going on and how I think things works (both possibly wrong) is this:

Something is draining the battery, and the key fobs aren't working (possibly because they have had the wrong batteries fitted).

The CCU is drawing more current than it should normally in a quiescent state, this is either because it's faulty, or another component is not allowing it to get to sleep, Like my stepson waking me up at 2am today because he had lost his key!

The key fobs not working could also be because of a faulty CCU.

So my theory is that, by using a different CCU, I might at least establish that it's either the CCU or something else. It will also be interesting to see if the rear doors lock with the other CCU.

If I'm completely barking up the wrong tree then, please feel free (anyone) to set me straight. I've been reading all relevant threads I can find, and trying to absorb information, but a bad nights sleep shreds my already limited brain capacity :/
 
audifan said:
Full VCDS scan. Let the car give you what it reports as wrong / faulty.
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Yes I know, that would be nice but I don't have the software and don't know anybody with it. I can't really justify the full version, and I've been looking at VCDS Lite, but not convinced yet. For now I will bumble along with what I have available. Cheers
 
DaveySprocket said:
Yes I know, that would be nice but I don't have the software and don't know anybody with it. I can't really justify the full version, and I've been looking at VCDS Lite, but not convinced yet. For now I will bumble along with what I have available. Cheers
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Might be worth checking the Free Scan Register to see if there’s anyone nearby, it’s a list of members (and their locations) who have VCDS and can help scan your car
 
Indi said:
Might be worth checking the Free Scan Register to see if there’s anyone nearby, it’s a list of members (and their locations) who have VCDS and can help scan your car
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Thanks for that, there is someone about an hour away, but neither of my A2's are road legal, so not really an option.

I've read all the threads about VCDS vs OBD etc and there seems to be plenty of people happy enough to muddle along with the OBD option. I got both these A2's for the grand sum of £200, mostly because they were headed for the scrap yard if I didn't have them. I might keep one, but definitely not both, but would ideally like to get them both back to a reliable and useable state. I have plenty of time to play with them and I'm not in a rush anyway, so I am happy to muddle along. I enjoy both the process and the learning curve, and I very much appreciate any input from anyone on here. I know it's probably frustrating when you get newbies asking daft questions and doing daft things, but I always try to solve things myself first before asking a question. :)
 
DaveySprocket said:
Yes I agree entirely about the batteries :)

I've been using this way to pair the keys, and it works on my Grey A2.

I guess there are more ways than one to skin a cat!

I've done it quite a few times now with no luck.

I have noticed though, that on the grey (Good) A2, if I unpair the key, the unpaired key still operates all the door locks, whereas on the dodgy Blue car it only operates the drivers lock. Not sure how significant this is, but it gives me a bit of hope that maybe the keys are not knackered, although a dodgy CCCU wouldn't be much more helpful.

I'm guessing I could swap CCCU's and keys over from the two cars to try out that theory, but I'm not certain it is as simple as that so I will have to do more research/reading.

Thanks anyway!
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Free shareware version of VCDS Lite is, well free and a lead is under a tenner. Any Windows laptop XP to 11. VAG specific, which generic OBD readers are not.
Mac
 
I already had the VW scanner because I look after my stepsons Scirocco. He does his best to destroy it and I do my best to keep it chugging on...
IMG_20240128_114738_HDR.jpg
I have two mates with A2's as well, so going down the VCDS road is probably inevitable..
 
Just gave it a much deserved wash, it's really in remarkably good condition for a 22 year old car!
IMG_20240128_125405_HDR.jpgIMG_20240128_125354_HDR.jpg
The seats are quite disgustingly filthy though, to be fair they were like that when I bought it many years ago. I might take them out and see if a specialist cleaners can get them spruced up. I like that they are a contrast rather than the usual Audi Black on Black on Black..
IMG_20240128_125455.jpg
I noticed a fair bit of oil on the alternator when I had the bonnet off yesterday. Something else to investigate..
IMG_20240127_094501_HDR.jpg
 
Honestly a wet vac would bring those up like new - if you don’t have one then it’d be a good idea to get a carpet cleaner with a handheld attachment that would do the job and as a bonus, could be justified to your partner very easily in terms of keeping your carpets looking their best!
 
dj_efk said:
Honestly a wet vac would bring those up like new - if you don’t have one then it’d be a good idea to get a carpet cleaner with a handheld attachment that would do the job and as a bonus, could be justified to your partner very easily in terms of keeping your carpets looking their best!
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Hire a Rug Doctor machine, for a day or so. You won't be committing yourself to endless carpet and upholstery cleaning that way
Mac.
 
dj_efk said:
Honestly a wet vac would bring those up like new - if you don’t have one then it’d be a good idea to get a carpet cleaner with a handheld attachment that would do the job and as a bonus, could be justified to your partner very easily in terms of keeping your carpets looking their best!
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Good idea, but my partner throws toast with butter and jam on, on the carpets for the dogs to eat, so you can maybe see the she might not see the justification.. And she paid for the carpets btw!
 
I just swapped out the CCU for this one:
IMG_20240128_110156_HDR.jpg
With this one in place, the rear doors were locking and unlocking, using the key in the drivers door. The quiescent current was way down as well.
IMG_20240128_140642_HDR.jpg
So still not conclusive I guess, but looking like a dodgy CCU.

The (possibly) faulty CCU shows these fault codes on my OBD reader:
IMG_20240128_144529_HDR.jpgIMG_20240128_144531_HDR.jpgIMG_20240128_144525_HDR.jpg

It does look like all the other fault codes I was getting before were spurious from disconnecting/connecting the battery so often, so that is a lesson learnt, and also a relief!
 
DaveySprocket said:
I just swapped out the CCU for this one:
View attachment 118288
With this one in place, the rear doors were locking and unlocking, using the key in the drivers door. The quiescent current was way down as well.
View attachment 118289
So still not conclusive I guess, but looking like a dodgy CCU.

The (possibly) faulty CCU shows these fault codes on my OBD reader:
View attachment 118293View attachment 118294View attachment 118295

It does look like all the other fault codes I was getting before were spurious from disconnecting/connecting the battery so often, so that is a lesson learnt, and also a relief!
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Any codes with the "new" CCCU, once the old ones are cleared?
Looks promising ...
Mac.
 
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