Wiring
The wiring for the seat base passes between metal springs and the foam seat bottom. Quite common for it to wear through then no heat. It will often blow the fuse with this.
Best starting point is to check you are actually getting power to the connector under seat. Remember the heating element is a switched negative when checking . Think yellow thick wire if I recall correctly.
Wiring diagram for seat connectors on here somewhere.
Other possibility is the thermostat stuck or not connected anymore.
Did they both stop working at same time? Or never worked?
Chris
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