08 Civic SI Heated Seats
 

Get a switch, wire positive and negative. Aren't there only 2 wires from the seat? Just make sure you put an inline fuse somewhere.

I looked it up and yes it only has 2 wires. Should be a red and black wire under the seat. Now if I was you I would get a relay just to make sure it doesn't work when the key is out. So get a simple relay, wire a constant 12v into the relay and then that to the seat. Wire a remote wire, from the deck (ACC) or anything that acts like it, and wire it into the relay.
Now the black wire from the seat will have to be grounded, that can be done anywhere, either at the base of the car (under any bolt that touches metal) or you can splice into another negative.
The relay will also have to be grounded. If you need more help pm me or post it here I can make up a simple diagram tonight after work.

i got rsx seats in my ek been wondering how to hook up the heated seats for awhile now.. a diagram would b nice to see

anyone know the wires used on the rsx heated seats? A wiring diagram would be helpful if that is possible :) thanx

http://img225.imageshack.us/img225/6286/trunkh.gif

If you cant follow that diagram...you should probably be getting a friend to do it ;)

The new Civic Si's never came with heated seats.

x2 qft