C4S Problem

[dave993cars]

Hi All

Need help, I have had my C4S outside instead of in the garage as my daughter was using the garage to work on her pride and joy (Mk2 Golf) having stood for well over a month I decided to start it, when I started the engine I noticed the rear wiper was working but it would not switch off, at the same time I could smell an electrical burning smell, I turned the engine off right away and disconnected the battery, checked all fuses (none blown), I removed fuse No 28 (rear wiper) reconnected the battery and started the engine (no rear wiper working) but I now had no heater control, switched off disconnected the battery, and removed the heater unit, as you can see it was the unit that had shorted I presume ? is this a known problem, two questions, would the wiper motor be linked to the heater problem, and secondly can these units be repaired or is it a new (or S/H) and if so where, thanking you in anticipation of some help.



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[jboult]

"Hen's Teeth" seems to be the phrase most commonly associated with the 993 CCU unit. Second hand (working) units tend to be rare, and often from left hand drive cars so the buttons are swapped. They cost silly money new from Porsche, so that's not normally an option.

I looked at getting mine repaired a while ago (which then mysteriously started working again, so I suspect it was probably a stuck valve all along). From memory there are a few people on the 'net who claim to be able to repair them, although they tend to be in the US (e.g. ECUDoctors), Germany etc. and I don;t know if they can do what they claim. I don't think I found anyone UK based.

Not exactly what you wanted to hear, but good luck with your search. If you do get it repaired I'm sure there's a lot of people who would be grateful to know who you found.

Cheers/John

 

[PTCSRS]

try Tore of Bergville for repairs

 

[Dekker]

ORIGINAL: dave993cars

Hi All

Need help, I have had my C4S outside instead of in the garage as my daughter was using the garage to work on her pride and joy (Mk2 Golf) having stood for well over a month I decided to start it, when I started the engine I noticed the rear wiper was working but it would not switch off, at the same time I could smell an electrical burning smell, I turned the engine off right away and disconnected the battery, checked all fuses (none blown), I removed fuse No 28 (rear wiper) reconnected the battery and started the engine (no rear wiper working) but I now had no heater control, switched off disconnected the battery, and removed the heater unit, as you can see it was the unit that had shorted I presume ? is this a known problem, two questions, would the wiper motor be linked to the heater problem, and secondly can these units be repaired or is it a new (or S/H) and if so where, thanking you in anticipation of some help.

As you already have it stripped down I'd have a go at repairing it yourself. There's a very good write up by Tore on his sight.
http://www.porschehvac.bergvill.com/

On the top right the top 3 links talk all about the CCU and HVAC unit and typical faults.
The 3rd item "Climate Control Unit details" gives a good oversight and the last part about Server Driver failure.
He says that the IC's are hard to find but they're easy to find on fleabay.
http://www.ebay.co.uk/itm/TCA2465-Integrated-Circuit-/400360973917

 

[dave993cars]

ORIGINAL: jboult

"Hen's Teeth" seems to be the phrase most commonly associated with the 993 CCU unit. Second hand (working) units tend to be rare, and often from left hand drive cars so the buttons are swapped. They cost silly money new from Porsche, so that's not normally an option.

I looked at getting mine repaired a while ago (which then mysteriously started working again, so I suspect it was probably a stuck valve all along). From memory there are a few people on the 'net who claim to be able to repair them, although they tend to be in the US (e.g. ECUDoctors), Germany etc. and I don;t know if they can do what they claim. I don't think I found anyone UK based.

Not exactly what you wanted to hear, but good luck with your search. If you do get it repaired I'm sure there's a lot of people who would be grateful to know who you found.

Cheers/John

Hi All

Thanks for the replies, I found a guy in Germany, quoting £350-£450 to repair, if can't be repaired he says he can offer a refurbished unit, anyone know of him or a way of checking him out.

Michael Sattler
Partisan Autoteile
Tulpenstrasse 13
D-82061 Neuried

I checked out the Tore of Bergville web site but as not an electrical engineer I don't feel confident to repair myself, I couldn't see if he offers a repair service, but if he did I would most certainly rather send the unit to him, if anyone has contact details I would be grateful, (I couldn't see any on the web site, but thats not to say it isn't there).

Still on the look out for a second hand unit, there are a couple out their, but as John said they are for LHD, I presume they can still be used on RHD ?

P.S.

I have just found Partisan Autoteile on the bay item No 251435715129, check him out let me know what you think !

Dave S

 

[PTCSRS]

see link to Tore


http://www.bergvillfx.com/index.php/services.html

 

[Dekker]

http://www.bergvillfx.com/index.php/contacts

 

[dave993cars]

ORIGINAL: Dekker

http://www.bergvillfx.com/index.php/contacts

Contacted, waiting for a reply, thanks, will keep you all updated.

 

[dave993cars]

Hi All

Pat your selfs on the back, I have had a reply from Tore, as per his emil, []

"I've repaired this exact problem a couple of times before, it is due to water leaking into the unit, and shorting the 12V power supply lines going between the boards. This will eventually burn out a PCB track or the interconnect wires. Your CCU will most probably be OK except for this".

So, off to him as soon as I get home at the end of the week, your next task (should you wish to accept it) is the problem with the rear wiper, what can cause it to be on all the time when the fuse (No 28) is fitted back in and is OK, could it be the the switch ?

Thanks for your help.

 

[Jonttt]

Have you sorted the root cause ie the source of the water. I would get that sorted before fitting a repaired unit and potential to happen again / cause another short and fire ?

Re. The rear wiper could be the relay is stuck open but seems a coincidence that the ccu shorted at the same time, leaking front scuttle/ windscreen causing both problems ?

 

[dave993cars]

ORIGINAL: Jonttt

Have you sorted the root cause ie the source of the water. I would get that sorted before fitting a repaired unit and potential to happen again / cause another short and fire ?

Re. The rear wiper could be the relay is stuck open but seems a coincidence that the ccu shorted at the same time, leaking front scuttle/ windscreen causing both problems ?

Hi Jonttt

I suspect condensation, We live fairly high up (above the snow line) and with the weather we have had lately and the car sitting outside having been in the garage all winter, it really only ran for a short time to get it out, standing for a good few weeks this was my thoughts, I started it because it was steamed up, but when I get home this weekend, I intend to check to see if I have water ingress, when removing the CCU I had a good look underneath the dash and although a cursory glance I did not see any water, also no water in the foot well, I like you, thought the wiper problem was either a relay problem or the on off switch is faulty, the fact the fuse has not blown makes me think it's not a short, still have an open mind and happy to hear any views.

 

[Jonttt]

The steaming up suggests water ingress, make sure you check the thick foam under the footwell carpets as they soak up a lot of water and the carpets can still be dry.

May be worth fitting a single wipe relay for the rear wiper, they are cheap and pretty easy DIY on a coupe under the rear parcel shelf.

 

[dave993cars]

Hi all

Anyone know where I can get a PDF wiring diagram showing the rear wiper (or anything I can download) thanks.

 

[dave993cars]

Hi all

Solved the problem with the rear wiper, it was the relay, I have also sent the CCU to Tore, with luck he will be able to repair it, I think I have found the source of the condensation/water, the dilemma is what is causing it. When I opened the boot there was a lot of condensation inside and water ran out of the ribs that run front to back on the inside of the lid, I think this would explain how the CCU was damaged, but don't know how I can have condensation in the boot allowing water into the dash, any ideas ? Car is now back in the garage with a dehumidifier inside it.

 

[Mark Elder]

Condensation on the inside of the bonnet lid is a problem in certain atmospheric conditions (although I suspect exacerbated by some damp getting in when driving due to worn bonnet seal). The seals do deteriorate (get squashed and no longer bounce back like they did when factory fresh) - I'm thinking of getting a new one. I bought a 1kg pack of dehumidifying crystals that I swap between the boot and the top of a radiator in the house. That seems to prevent the condensation building up and running onto the electrics when I open bonnet.

I don't understand how it would get from the bonnet to the CCU...

 

[dave993cars]

ORIGINAL: Mark Elder

Condensation on the inside of the bonnet lid is a problem in certain atmospheric conditions (although I suspect exacerbated by some damp getting in when driving due to worn bonnet seal). The seals do deteriorate (get squashed and no longer bounce back like they did when factory fresh) - I'm thinking of getting a new one. I bought a 1kg pack of dehumidifying crystals that I swap between the boot and the top of a radiator in the house. That seems to prevent the condensation building up and running onto the electrics when I open bonnet.

I don't understand how it would get from the bonnet to the CCU...

Hi Mark

I have had a look at the boot seal, and it is slightly deformed, I am presuming when I opened the boot the water in the channel sloshed to the end near the windscreen and went down behind the fuse box into the dash, all hypothetical but I don't know how else, I am looking at new seals.

Good news all, Tore has received, repaired and subject to payment will be sending my CCU back to me, even better, total cost (excluding post) £250.00, his service is quick, contact is excellent and I would highly recommend his services, thanks for pointing me in his direction, even if my unit was unrepairable, at a cost of £9.00 just to get an estimate to repair was well worth sending it to him, thanks. []

Dave S

 

[dave993cars]

Please see photos from Tore showing the extent of the damage,

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