Please use circuit diagram of climate with circulating air

Hey, guys.

I drive an Audi 100 Sport Turbo Quattro and the car has a special feature:

It has a climate with recirculating air function, which seemed almost never to happen in this model series. But now there are problems. Somewhere there is a mass error and thus constantly problems arise like adjusted tank indicator, odometer does not work, error flashing flashes like wild etc.

When disassembly of the entire interior I saw that some cables are not connected or. Hang out loosely. Therefore my request to you. I would need a schematic of the complete wiring of the air conditioning with air-circuit switch.

But if anyone can tell me where the black-grey cable from the green plug has to go, something is already helping me.

Thank you in advance.

Greeting from Munich

Karl S.