I just purchased my 1st hummer. After going through a few things I noticed driver power seat issues. When I press button forward, it moves back. When I press back it moves forward. And it will not move up or down. Lumbar works as well as back moving up or back. I tried replacing switch and this changed nothing.

 

The seat memory module under the seat needs to be re-programmed. It is a known issue that does pop-up on occasion.