There is an electrical connector underneath the seat. Verify it is connected. If it is connected, check the fuse (find fuse location underneath fuse box lid). If those two check out, check the voltage at the electrical connector underneath the seat with the heat switch on. Other possibilities include a broken wire inside the seat. If one of the heater wires is broken inside the seat there will be no continuity and the heat will not work.
what does the connector under the seat look like?
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SOURCE: Drivers side heated seat not working what can I
check the fuse on the panel, the fuse panel are located in the driver side right by the panel,and check the wires under the seat.
SOURCE: Heated seat
It is the heatling element, stock elements have a single wire snaked through the element and when the circuit breaks it is done, aftermarket elements have a wired grid that if one area fails it still works, they also spread a more even heat.
SOURCE: 1999 Cadillac Deville Driver side power seat not working
No fuse.These seats are protected with relays and a seat module.The module is under the drivers seat.There are 3 connectors and it would be hard to check all these wires for power to the motors.First look under the seat and make sure none of the connectors came apart under the seat by something that might have been left or rolled under it.The 2 main ones you can check are the connector 2 terminal C and connector 3 terminal A.C is a black wire which is ground and A is a red wire which is the feed power wire.Connector 2 is green and 3 is black.If the ground and power wires are good then you could have a bad drivers seat module.What I would do is go to the salvage yard and find a used module to try.Good luck.
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SOURCE: FRONT HEATED SEATS
you need to check the resistance in each of the heated seat elements in the seat. There's a two wire connector under the back of each front seat. The connector should be green. disconnect it and measure the resistance along the circuit going into the seat. if it isnt .1 - .3 ohms, replace the appropriate heated seat element
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Your most likely going to need a new seat heater pad under the seat cover. This is basic warranty so 5 yr or 60000 miles under factory warranty. Hope this helps
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