The heated seat on the driver's side of my 2005 Uplander stopped working. It is not the fuse, and the switch shows the one or two lights showing power level. The Passenger heated seat works OK. Any suggestions - relay, connector, element??

Question edited for clarity.
Question moved from Spanish Car company 'Seat', pronounced See-At.

Check Fuse 13 (Heated Seats)

https://fuse-box.info/chevrolet/chevrolet-uplander-2005-2008-fuses-and-relay

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TURN KEY ON , REMOVE FUSES ONE AT A TIME ,TILL PROBLEM STOPS ,CHECK COMPODENTS , DIS CONNECT WIRES ONE AT TIME TIL PROBLEM STOPS,REPLACE DEFECTIVE PART OR RELAY

Hello-
If your fuses are good, perhaps your heated seat switch is faulty. You can test the switch for connectivity using a meter to see if power is going through the switch when in the ON position. If the meter shows no power while in the ON position, replace the switch. If power is reaching the seat, then likely the heating element itself within the seat is the culprit.

I don't know the history of your problem but I notice the reference to the relay. Heated seats often have problems and it can be things other than the relay. Heated seats work very similar to an electric blanket and just the same they often simply burn out...in most cases it is easy for a good tech with a simple multimeter to determine whether this has happened. The relay can be tested by verifying that it has constant power at one terminal possibly with the key on...if it has that then the fuse is good. this type of relay is usually supplied with a second power lead for relay control that is only powered with the key on. When the switch is depressed it usually will give you a ground at the relay which activates it and allows power to go through the heated seat element. All that is needed is a simple test light. Most relays have a nice diagram on the side to identify the terminals and what they are. A relay simply uses a low current circuit (switch side) to control a high current circuit ( load side). On the relay illustration it will show you a small coil which magnetizes when the switch sends current through it and pulls the switch for the load side closed. Most of the time the wires for the control side are much smaller than the load side. I hope this helps!

If the lights are on then you have a heating element that is bad.There are 2 on each front seat.One for the back and one for the cushion.You need to ohm the back and the cushion to see which one has an open circuit.You will need to know how to use an digital multimeter.The connectors are under the seat.This is a known problem with seat heaters.Hope this helps.Let me know if you need more help.Good luck.

need to check the switch may be bad or shorted out

First check the fuse and the connection under the seat. If these are both ok disconnect the heater connection under the seat and use a multimeter to see if the heating element is operational.

you need to check the fuses and make sure the element is good and its plug is not loose stop by your local Ford dealership in the parts department and they be able to print you off pictures and diagrams showing yo where its located and what it look like wish you the best of luck Michigan Man.

Try swappingt the heater seat switch from the passanger side switch to see if thats the problem.

DID YOU CHECK THE FUSES AND RELAYS UNDER THE HOOD ON THE DRIVERS SIDE OF THE ENGINE COMPARTMENT