Audi S2 RHD Digital Climate

[Tonks4x4]

I have half a dozen more wires for the aircon side to sort and I still need to mount my daylight sensor and the little temp sensor motor, but did not want to just hack into my dash just yet. I want to see if I can get the RS2 dash insert for temp sensor motor and sink that in nicely.

However the auto temp appears to work as it should and all the directions work


Tonks4x4 - The Land Rover Specialist

[rj scotty]

Home straight mate

[S2central.net]

I still have all the parts to do this conversion on a B3/B4 but is probably surplus to requirements. I would still like to do the conversion for someone though.

Anybody in Ireland fancy a digital climate control installation ?

[Error404]

I want to see if I can get the RS2 dash insert for temp sensor motor and sink that in nicely.

You mean like this?




http://www.s2forum.com/forum/showpos...&postcount=718

I also modified the cruise control ECU bracket to hold the fan motor as per LHD. Bracket is away being zinc plated so don't have any pics of that unfortunately.
Sunload sensor fits really nicely in the screen vent with some careful trimming


Install looks nice mate.

I have almost finished mine now too, just need to actually install the dash, engine, gearbox & AC pipework in the engine bay

[Tonks4x4]

If like to see that cruise control bracket! I don't have one and my cruise ECU is just zip tied to the rear of the heater box at the moment.

Is there 2 parts to that little vent thing? I can't make it out on etka very well.

I was put off mounting the daylight sensor in the window vent as it would mean putting a hole in the ducting and loosing puff up the windscreen

Another question for all you climate junkies.

Is there any way of getting some kind of output from the climate head when you press the window demist function?

And a picture with the flash on



Tonks4x4 - The Land Rover Specialist

[Error404]

Do you mean the windscreen demist button? If so yes AFAIK it should ramp up the fan speed, divert the airflow to the screen vents and activate the AC clutch.

There are two parts to the temp sensor dash vent - one is the temperature sensor housing. The other is the trim piece

Upper trim piece - 443 820 543 A
Sensor Housing - 443 820 541 A
You also want the foam gasket which is 443 820 969

EDIT: Sunload sensor: I drilled a hole in the duct to put the harness through - I used some of that foam insulation tube on the harness which fills the hole nicely. The plastic is a bit thin & weak to use a grommet, I was afraid of cracking it. The sensor will fit nicely in the windscreen vent with some minor trimming. I used a few dabs of a hot-melt glue gun to stick it in place and be able to remove it later if required.
I also installed the upper vent temp sensor nearby. I will take some pics later when I get home from work

[Tonks4x4]

Do you mean the windscreen demist button? If so yes AFAIK it should ramp up the fan speed, divert the airflow to the screen vents and activate the AC clutch



There are two parts to the temp sensor dash vent - one is the temperature sensor housing. The other is the trim piece



Upper trim piece - 443 820 543 A

Sensor Housing - 443 820 541 A

You also want the foam gasket which is 443 820 969

Thanks I'll get them ordered today. I guess they will be a pain to fit now the dash is back in!!!

Yes the windscreen demist button. What I wanted to do is use an output from this to activate the heated front screen timer relay.

It would make sense to have it linked to this as I have no switch blanks left for a button.


Tonks4x4 - The Land Rover Specialist

[Error404]

Maybe you could get some kind of output from the unit when the fan speed, windscreen vent & ac clutch are all engaged at the same time? I'm sure Johne will know the answer to this techie question

Yes that sensor & trim will be a pain to fit with the dash in, likewise the sunload sensor. You might be able to get access for the temp sensor & trim with the glovebox removed.

[johne]

You might be able to get access for the temp sensor & trim with the glovebox removed.

And/or remove the instrument console for access.

If you don't want to attack the windscreen vent, I'd skip the sunlight sensor. I've no sense that it adds anything useful and after mine played up I've disconnected it and my system works fine without it.

Having the temp sensor in the dash crashpad isn't the best place anyway as Audi found out and moved it on later cars. If you don't want to cut your dash consider fitting the sensor inside the lower steering wheel cowling and the fan behind at the base of the instrument cluster on the left. The sensor and fan don't have to be next to each other, just joined by a length of tube.

John

[johne]

Is there any way of getting some kind of output from the climate head when you press the window demist function?

There's no direct output I'm aware of nor a "spare" output from the controller that can be reprogrammed.

To create an ouput to drive a heated screen relay I'd fix microswitches to the flap actuator arms for the temperature and screen/feet flap motors so that they close when you're at maximum hot and full screen selected. Wire them in series and then use that to feed the screen relay. That way, whenever the system goes to full heat and screen the heated screen would come on which in effect would be whenever you press the defrost button.

Or, more elegently electronically, you could monitor the position output voltage from each of the heat and screen/feet flap motors (which varies from around 1 volt to 4 volts depending on their position) and drive the heated screen relay when they are at there respective end stop positions.

John

[Tonks4x4]

Audi S2 RHD Digital Climate

There's no direct output I'm aware of nor a "spare" output from the controller that can be reprogrammed.



To create an ouput to drive a heated screen relay I'd fix microswitches to the flap actuator arms for the temperature and screen/feet flap motors so that they close when you're at maximum hot and full screen selected. Wire them in series and then use that to feed the screen relay. That way, whenever the system goes to full heat and screen the heated screen would come on which in effect would be whenever you press the defrost button.



Or, more elegently electronically, you could monitor the position output voltage from each of the heat and screen/feet flap motors (which varies from around 1 volt to 4 volts depending on their position) and drive the heated screen relay when they are at there respective end stop positions.



John

Is the screen logo on the head unit LCD or LED? do you think it's possible to solder a fine wire to the LED/LCD track on the pcb in the head unit that you can use as a direct trigger for a relay?
I am guessing it will be still 12v

Has anyone got a broken one I can dissect?


Tonks4x4 - The Land Rover Specialist

[Error404]

The displays are LCD - for illuminaton, the early ones use bulbs, the later ones use LEDs

[Tonks4x4]

The displays are LCD - for illuminaton, the early ones use bulbs, the later ones use LEDs

So this should be possible you think?


Tonks4x4 - The Land Rover Specialist

[rj scotty]

I was looking at this when I was trying to work out a way of controlling the vacuum recirc flap with the later head unit.
My idea was to use the recirc symbol to drive a relay via a transistor.
I don't see why it would not work

[Error404]

Some more pics for you Brian

Sunload sensor: it doesn't quite sit flush how I have it installed, as the ducting below interferes with the sensor body, but it looks tidy and I can easily replace it if required





Harness for the sunload sensor comes out of the back of the ducting, sheathed in one of the foam tubes. I decided to put a two pin connector on the harness so it was easier to install the dash. The other sensor is the central vent temp sensor



Also found a pic for the cruise ECU mount that will support the intake fan motor - not finished in this pic but you get the idea. The cruise ECU mounting is normally inverted and also retains the glove box latch, I've flipped it and chopped a piece off and bent it a bit. The motor will screw to it, and the mount will rivets to the metal skin in the dash




HTH
Alex