Got a Mondeo at work, MK3 ST shape. Has full heated leather interior. When pressing the buttons for the front seats, both LED's on the switches illuminate so there is power going to the switches, but both seats remain cold? Wiring underneath the seats is fine. So why won't they warm up? Is there a relay or something for these? I imagine it cannot be fuse because if it was the orange LED on the switch wouldnt illuminate if the fuse was blown?