seat heater light not working?

[f5fstop]

Wiring schematics show it has a small LED. psywzrd is correct, the passenger heated seat switch must be enabled through the seat belt switch in order for heated seat operation to occur.
Due to this feature of the heater not working when no one is sitting in the seat, no light on the dash would be required. Most drivers know the heater is on the driver's seat, due to the sweat running down their crack.