One of the plugs, I think the yellow one, is for the seatbelt pretensioners. Disconect the car battery before messing with these or the pirotechnic tensioning charge might go off. The green plug is probably for the heater mats in the seats. If you pop the long narrow panel up infront of the ashrtray and perhaps unscrew the ashtray aswell so you have more room, you should find two square plugs taped up in there. If you have then you already have the wiring loom for the heated seats and you just need to buy the switches (bloody expensive) as well as a new pannel with the holes for them, and stick a fuse in the apropriate plase in the fuse box. (cant remeber if theres a relay but a quick look at the user manual should show that.