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Replace the fuse with one the same rating. If the seat now works.... smile. If the new fuse blows or the heat does not work you may have a short (or a broken wire) inside the seat that's causing the problem. It's an 11 year old seat.... tearing it apart to find the source may not be worth it.
They are timed like rear demist, the manufacturers reason this.... Starting a cold car takes time to warm up so they give us heated seating. As your journey continues the car gets warmer as the engine heat is directed towards the cabin via vent settings. The seats are power hungry and require much juice to heat so as the cabin temp rises, it takes over the job of heating your whole body and not just your posterior (so to speak), the seats will automatically switch off. Press the button again and they should come back on for the prescribed time.
I looked in mitchell service information, what engine? 4.2L 6cyl, or the 5.3L v8? Mitchell shows a fuse box under the hood, and an addittional fuse box located beneath the 2nd row seats. I could not find a fuse that is dedicated to the heated seat function.
its not the module,,its more than likely the drivers side seat heater element,i would say the seatback element,remove the seat cover,just unlatch it under the seat from the rear of seat under it and then pull up its velcrod on,,and then youll see a little burn on the heater pad and thats your problem,then you need a new element,,,thats why theydont work,it causes a open in the system