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I don't know the answer, but I have 8-way power, heated sport seats in my S2 that came from a 1986 951.
I have never tried the heat...so I am curious to know the answer !
There are relays in the seat (underneath) that probably came with your seats and you need to make sure there's a fuse in the fusebox (marked). That's it.
I just bought heated sport seats and they were plug and play. As noted above, there is a fuse in the panel but no relays.
That is a serious lack of curiosity my friend!
As a rule, the porsche is generally parked in the winter so I have never had occasion to try the heat. They were 'plug and play' in so far as all the power adjustment featurers worked.....but I bought them to hold me in place on the track better than the stock non-sport seats...not so much for the heat.
take a look in the bottom of the seat, folks. There are relays for the seats that have a simple switch, and a "control unit" that looks just like a relay for the seats that have a dial.
Last edited by ninefiveone; 10-27-2009 at 12:42 AM.
Reason: Correction