Check the power plug array and see that the terminals are not corroded
Same problem on my 2004 Yukon Denali. Drivers side seat won't move, no lumbar, no heated seat and passenger side heated seat will not work either. All fuses were tested. Problem was a wire under the drivers seat towards the back of the seat. You can reach it from the rear but we started front to back to trace the problem. The wires are in a white case harness I guess you call it under a cover/case. The ground wire is burnt. You can bypass the wire and rewire around the outside of the harness. Totally wish i would have had this answer earlier. My brother figured this out with a wire/fuse sensor testor and super huge brains! He checked everything and was about to give up after removing the module under the seat which holds a circuit board that cannot be worked on when he tried one last thing. You can manually lift the bottom of the seat by unscrewing it since the seat adjustments are broke. It lifted right up and you can get better access to the wires in the front to trace them to the back. He told me the two wire colors to check but all I can remember is the orange one which was not the color of the one broke on mine. Maybe black? You could visibly see the white wire harness was burnt at one port. I hope this helps. I could get more technical by calling my brother if you get stuck.
This helped me immensely! There are two nuts under the drivers seat that will allow you to remove the seat. the back of the seat just has pins that will lift out by sliding the seat forward once the nuts are removed. You will have to disconnect a few connectors, but once you do that, you will be able to get to the problem connector. There is a little black cover over the problem connector that unclips exposing the problem connector. On mine, the orange wire was almost brown from the heat that it had seen. As the connection begins to corrode, it acts as a resistor. A resistor has to dissipate heat, resulting in the heated wire. The resistance also causes a voltage drop keeping the power seats and the heated seats from working. It would not be easy to fix the contacts in the connector, so I found a piece of 14 gauge wire and spliced into the orange wire on either side of the connector, bypassing the contacts in the connector. You will need a heavy soldering iron such as a soldering gun to get enough heat to solder to these heavy gauge wires. Once you have spliced into the wires, wrap them heavily with a good electrical tape. Reconnect all other connectors and put the seat back on. Everything should work now!.
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