Climate Control Pinout Needed

**4Loops** · 09-15-2016 01:04 PM

Hi,

I'm in the midst of a V8 ART swap from a c5 into my b5, and I'm at the figuring out the wiring stage. At the moment, I'm mapping the connectors that are in the ECU plenum chamber.
I see that some of the pins need to go to the climate control module at the dash. I see differing wiring between what the C5 Bentley says and what the B5 Bentley says. I'm finding the C5 service manual to be quite useless at times: it does not contain any wiring diagrams for the climate control module. The B5 manual does, but that doesn't help me to figure out what wires are what signals on the C5. It would be helpful to me if I knew what signals were on what wire, so I can make sure to swap the pins in the plenum chamber connectors appropriately.

I've searched around for quite a while now, and I can't find a pinout for the climate control module (klimabetatigung), not on the interwebs nor in the A6 bentley book.

Would someone have this pinout information they can share with me, for the climate control module from the C5? PN 4B0820043
Looks like this:

A6ClimateControlModule

More specifically, I'm looking at the C5 service manual, and I see a wire that needs to go from the T15u(red 15pin connector in the plenum chamber), to pin A7 on the climate control module. Usually I can find the other module in the diagrams and see what type of signal this is, but there's not a lot of information with the C5 book. But nonetheless, it would be useful to have a full pinout, because this is not the only wire going from the climate control module to the ECM.

If I had a pinout, I wouldn't have to guess at what the signals are.

Thanks!

**G0to60** · 09-15-2016 01:56 PM

I believe there is a difference between pre-2002 and 2002-2005 climate controls. The one you have pictured looks to be a pre-2002 because it has the OFF button instead of the Automatic Recirc button. I can't help you with pin out info though.

**4Loops** · 09-15-2016 02:13 PM

Aah, good point: I should clarify, (and verify the picture I posted matches the module that's in my A6 donor).
My A6 is a 2000 model year, built (IIRC) in July of 99.
Strange: The radio headunit has a sticker with a pinout on top of the unit, and I can find all kinds of wiring diagrams on what pin is what signal.. but absolutely nothing on the climate control module.
I suppose either way I'll be probing for continuity on wires to make sure of where my wire(s) in question are going (to what pin on the control module), but I might have to throw on my detectives hat to deduce what wires would be used for what signals.
I can think of a number of signals that would be useful to the climate control module: coolant temp, engine running or not, A/C pressure, CAN/Diagnostic K line, etc.
I can also think of some things that the ECM may want from the climate control module: A/C on/off selection (ECON button), blower motor speed, selected temperature, Defrost button selected, maybe more.
Probably won't hurt to leave the ECM side (that is populated) of the connector going to nothing on the car side of the connector. If I notice I don't have a certain HVAC feature or A/C isn't working I can maybe probe the signal to gain some clues.

Thanks for the response!

**4Loops** · 09-15-2016 02:31 PM

Anyone have the Bentley CD for the C5? I hear it has some information that the paper repair manual does not, and vice-versa.
Maybe they could be a dear and share a diagram of the this module??

**seishuku** · 09-15-2016 03:33 PM

I can only help with a post-facelift pinout...

Code:

D01 - 
D02 - Left temp flap motor+
D03 - Right temp flap motor+
D04 - Central flap motor+
D05 - Air flow flap motor+
D06 - Air flow flap motor-
D07 - Something from cluster?
D08 - AC relay
D09 - Switched power from cluster?
D10 - Left temp flap motor-
D11 - Defrost flap motor-
D12 - Defrost flap motor+
D13 - Right temp flap motor-
D14 - Ground
D15 - Ground
D16 - Central flap motor-

A01 - Standing time input from cluster
A02 - RPM input from cluster
A03 - Engine overheat warning light output
A04 - 
A05 - Display illumination (terminal 58d)
A06 - 77
A07 - From ECU?
A08 - Speed input from cluster
A09 - Ground
A10 - Soler cell active input
A11 - 
A12 - Ground

B01 - Ground
B02 - 
B03 - Switched ignition? (terminal 75al)
B04 - 
B05 - Photo sensor
B06 - Photo sensor
B07 - 
B08 - 
B09 - Outside temp input
B10 - Center vent temp input
B11 - Right vent temp input
B12 - Ground?
B13 - 
B14 - Center flap position input
B15 - 
B16 - Defrost flap position input
B17 - 
B18 - 
B19 - 
B20 - Fresh air temp input

C01 - Air flow flap position input
C02 - Left flap position input
C03 - Air quality sensor input
C04 - K line from cluster
C05 - 
C06 - Something with soler cell?
C07 - 85
C08 - 
C09 - Right flap position input
C10 - Left vent temp input
C11 - Wiper/washer relay
C12 - Blower motor output
C13 - N/A
C14 - Ground
C15 - ECU?
C16 - Vref (flap position)

F1 - To rear defogger
F2 - From rear defogger fuse

**4Loops** · 09-16-2016 06:14 AM

Wow! That's darnright helpful! Thanks!
I see you even have many of the signals figured out. Unfortunately, for my one wire in question for the moment (A07) I'll still have to figure out what in the world it does.
This is good stuff!

**Kaane** · 09-16-2016 06:22 AM

Here you go, here is the diagram from ELSA for 2000 A6 Climate Control.

https://mega.nz/#!ro0FGaCD!RjzKI-zOS...5SgaP_EXFziw3A

Here is the ecu side. It doesn't have signal descriptions unfortunately.

**4Loops** · 09-16-2016 07:40 AM

Thanks Kaane, but yea, that's all the Bentley service manual shows too, Just that ECU pin 40 goes through the T15u connector pin 2, and then to the "AC Control head" E87 pin A7. But yea, no descriptions. Booo Hiss.
Not sure what your link was: it wouldn't open in any browser for me. (unless it was a link to the pic of the diagram you posted).