I had this issue as well. Drivers seat no worky, but _/ lights on ok. I have only just got the 2010 car, having previously had a 2006 model. So, I downloaded the firmware update for the IID from GAP and registered the car. After a first pass 'clear all ECU faults' I tried the heating and cooling and hey presto it is now fine. Unfortunately I didn't capture the fault code (doh!).

Brill customer service from GAP as well

Cheers,

Andy SDV8 AB MY 2019
SDV8 VSE MY 2015 - Gone
5.0 S/C AB MY 2010 - Gone
4.2 S/C VSE MY 2006 - Gone

Just to confirm, on my old car which was an 07 Vogue SE the heated & cooled seats do indeed have electrical heaters. I replaced one when I did the driver's seat base foam. The cooling is piped in from the air-con.

If the heater element is knackered then replacing it will require a pair of hog ring pliers to release the leather and for the sake of 40 quid you might as well replace the seat base foam while it's all apart.

Dom