Electrical Questions

[Christo Atanasov]

Hi there,
I have some wiring questions about '85 Audi 200 2.1Ti (FWD).
First of all may someone tell me how electronic climate control operates rear glass and mirrors heaters, because in my case I have switch for these on control module but whole module does not work. And I realy need these heaters now. I plan to install external switch, but don't know wich wire to brake by this external switch.
Also I want to make separate programmable ignition module, but I don't know what signal tachometer expect to receive. Folowing wiring diagrams I saw that this signal come from ECU instead of ignition coil as usual. How many pulses/rev it expect and what shape?


Christo Atanasov,
'85 Audi 200 2.1Ti (KG)