Seat heaters

["Trevor Turner" <ytt105@xxxxxxxxxxx>]

This question is about seat heaters.

I have an E23, 1986 735i. The vehicle was NOT fitted with seat heaters as 
standard. I live in Australia, so presumably it was not considered cold 
enough, but here in Canberra we have just had a week of            -6deg C 
to  -8deg C. That's cold enough!

After a bit of investigation I have found that my car does indeed have the 
heatering units already built into the seats, only the wiring is missing.

I have a basic wiring diagram which shows the relay and heating unit wires, 
etc but I have two problems so far.

There are two input wires to the relay and one to the switches . Does anyone 
know what these are and where they come from.

Also the switches.
I have no understanding of the  workings of these switches, ie. do they have 
a timer, heat control or what built in, can I use just one to control both 
front seats, can I wire up a standard switch instead of the genuine article, 
where could I get a genuine one and how much would it cost.

That's more than two questions isn't it, sorry.

Any help would be appreciated, especially a detailed wiring digram of the 
switches, relays, etc.

Regards from DownUnder
Trevor Turner
Canberra Australia



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