I'm having a problem with my window switches in my driver's door in my '04 Envoy. The window switches in the driver's door are not working any of the windows, but when I use the other switches in the other doors those windows work. Also, my door lock button and window lock button on the driver's door are working. I have no clue what is going on or how to fix it, and I really don't want to spend $300 on a new master switch. Can anyone help me?