I have a 05 2500HD crew cab all windows and door locks work except passenger side front also electric mirror on passenger side does not work.Looking for help any suggestions?

 

I would start by making sure all fuses are good. If they are then pull the switch assembly out from the passenger side door panel and test for power in and out at the switch. I got lucky once and the plug had just come undone on the passenger side. You can access the mirror wires by just pulling the panel from directly behind and again test for power to it.

 

I would think you have a common problem here. Not likely that both would go out together. I would guess a wiring harness or plug pulled out. Good luck.

 

Also could be the relay switch.