heated driver's seat not heating...

[SteveH]

Hey all;

It just started getting cold(ish) here in the South! I flicked on the driver's seat heater ('90 560 SEL); the two red lights on the switch came on, but I didn't notice any heat from the seat whatsoever. The other seat heaters work.

I looked at the connections in the front underside of the seat, and all appear to be in good order; the seat adjusts in all directions without hesitation. There are no blown fuses.

Can anyone point me in the right direction to any other areas/things I can check to make the seat heat up?

Thanks in advance.