..and my heated seat is not working;

The car: W124, 1989.
Is there a relay somehwere? If so , Where?
yes, the fuse is OK.
The red lights on the switch illuminates (both positions) and the wiring is correctly connected under the seat.

Any hints?
Thanks

I had mine crap out when the car was 8 years old. They worked intermittently before they completely gave up. On my car the control module for the heated seats is under the rear seat, driver's side.

The problem is the relay contacts burn out in the module from the high current. The module costs ~$300. I fixed mine by replacing the relays inside. The relays are available at a good electronics store for $7 each. There's 4 in the module.

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95 E320 Cabriolet, 159K