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Can i transfer this CCU into another 964 plug & play?
I know there are a few threads about this- however my situation is a bit different. The CCU unit i want to get is already in a 964 and it works, it looks like the 993 CCU, i think since it has the 2 different AC buttons. My question is, can i put this unit in my own 964 and then put my 964 CCU unit back in the other 964 and all will work? Any special relays the car may need to have or so? i have read that 2 pins need to be jumped, but i'm assuming since that CCU is already in a 964 they would already be jumped?
I am terrible at fixing stuff so hoping this is just a simple trade both CCU and both will plug and play in each car and function correctly.
I swapped a 993 ccu into my 964. Went from a single ac button to dual. My shop has to do a (seemingly) simple rewire but it works well. Can't speak to the process other than saying it can be done easily.
I swapped a 993 ccu into my 964. Went from a single ac button to dual. My shop has to do a (seemingly) simple rewire but it works well. Can't speak to the process other than saying it can be done easily.
Thanks for the info. I better let a shop do it- more $$ lol
Originally Posted by tjb616
Are you looking to add functionality by adding a button, or replace a broken or worn button or faceplate?
For what its worth, I believe the CCU is very specific to the car with unique programming and swapping them out is not recommended.
I think you are talking about ECU not CCU, CCU isn't specific to each car i don't think. I just like the look of the other CCU better
I think you are talking about ECU not CCU, CCU isn't specific to each car i don't think. I just like the look of the other CCU better
I am 100% certain about referencing the CCU. It is a programmed unit with diagnostics and it is involved in much more than controlling the HVAC in the car. There are differences year to year (and IIRC, for different trims in the same year) in the coding and the wiring. Send CCU Doctors or ToreB a message, they will both have better insight.
Yes, the CCU does more than "just" climate control as stated above. Yes, you can swap them between cars. The 964 part numbers are superseded by 993 part numbers. Cars from model year '89 and '90 need a small wiring modification when using a 993 unit. If the original 964 CCU part number ends in 00, the wiring needs to change for a 993 unit, if it ends in 01, you don't need the wiring change. Again, the change is made in the wiring harness used in the car for a model year. For example changing from a 96465904700 (with AC) unit to a 99365904700 unit , you need the wiring change. Hope this helps.
Yes, the CCU does more than "just" climate control as stated above. Yes, you can swap them between cars. The 964 part numbers are superseded by 993 part numbers. Cars from model year '89 and '90 need a small wiring modification when using a 993 unit. If the original 964 CCU part number ends in 00, the wiring needs to change for a 993 unit, if it ends in 01, you don't need the wiring change. Again, the change is made in the wiring harness used in the car for a model year. For example changing from a 96465904700 (with AC) unit to a 99365904700 unit , you need the wiring change. Hope this helps.
Thanks. Then probably not a good idea to take the 993 one thats in the 1989 and put it in the 1991, it won't be plug and play because it must have been modified to fit in the 89
Tarek, I think it's actually the other way 'round: the CCU does not get modified, the wiring harness does. So if the '89 has a 993 CCU that means it (the '89 964) would already have been modified to accept the later 993 CCU.
Tarek, I think it's actually the other way 'round: the CCU does not get modified, the wiring harness does. So if the '89 has a 993 CCU that means it (the '89 964) would already have been modified to accept the later 993 CCU.
hmmm, then i'll go ahead and swap to see what happens- only way to really know! Thanks for all the help
Tarek, I think it's actually the other way 'round: the CCU does not get modified, the wiring harness does. So if the '89 has a 993 CCU that means it (the '89 964) would already have been modified to accept the later 993 CCU.
Exactly. The CCU is not modified, the wiring harness in the car gets a small modification.
In general, the 993 CCU has more OBD diagnostic functions and will allow for completely turning off the two front blowers compared to the first generation of 964 CCU's. Some more functions were introduced in the 993 CCU's, such as the outside temp sensor, rear air intake selector valve and resirc valve control. The A/C max switch on the 993 CCU is a mere shortcut button to settings that is easily done manually. (A/C on, minimum temp, max fan speed, footwell off, defrost slider to minimum)
The CCU models are (almost) interchangeable, but a 993 CCU will need rewiring of the car CCU harness to work properly. But beware, the Porsche workshop bulletin for this is not complete, several wiring actions are needed in order to avoid problems, depending on the original and donor CCU part numbers. There is even risk of damaging the CCU if a 993 part is used in a 964. Using a later 993 CCU in a 964 needs at least five rewiring actions on the CCU harness, not only the bridge between pins G1 and G19.
Cheers,
Tore
little update, so i switched them, and everything worked- However i noticed switching from heating coming out of vents to foot well did not work, so switched them back and realized that 993 unit also wasn't doing that in the other 964 it was in. Mission failed overall lol- each one after all the headache pulling them out went back to the car it was already in
10-13-2018, 02:33 PM
Can i transfer this CCU into another 964 plug & play?
