the relay for the heated seat circuit 1 relay for 2 seats.
the thermistor is what regulates the tempature.
if you go to the wds site it will tell you how to troubleshoot your heated seats to find out what exactly is wrong. You will need a meter to measure voltage and resistance

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E53 06 3.0i

wishlist
Comfort Seats
speckdock 2.5

Mods
Air suspension - wip
skid plate replica - in box
OEM sunroof deflector
OEM bluetooth streaming
navi,dsp,tv retrofit - wip
Low prof roof racks
2 directtv satelite tuners
Grom audio usb2
quarter and back window sunshades
2 10"subs- boxes opposite sides/Alp MRP-M850
rear heated seats retrofit
rear footwell lights retrofit
remote window roll up