It's more than likely just dirty contacts in the seat switch. I've had to fix mine once before, and now the other side is ready. Here are a couple of links to help:
http://www.rangerovers.net/repairdet...atcontrols.htm
http://www.jpurnell.com/RR/repairs/seat_switches.htm
Lots of tiny springs and ball bearings what will fly everywhere when you open it. So do it carefully, and inside of a shoe box or something
