1) Start a new thread....
2) Do search on here...loads of previous threads (including one very recently) on this very subject
3) Most likely a broken element (they fracture easily) check out this link.... Heated Seat Repair on Range Rover 4.0/4.6
But always remember rule No.1 above....try not to hi-jack a thread...start a new one..>!!!
The haemorrhoid cultivators are a common failure, the elements fracture or the connections fail Look at www.rangerovers.net for info on removing the seat skin