This is from when i did the job http://forums.pelicanparts.com/porsche-911-technical-forum/221546-one-wire-much-my-seats.html

Paul,
No switch for heat on the seats. I am just going to wire the red and brown and be done with it. I will extend the black wire and safe off in the trunk.
I will look at th thread you started ealier. I appreciate all the help and Insight of all that helped.
Al

No problem Al, good luck....