Power Lock Issues

[_GMAN_]

On my 07 Burb LT, The power door locks dont always unlock. When I use the key fob, the drivers door always unlock, and after two presses all the doors unlock except for the drivers rear door. 95% of the time it doesn't. I would then have to manually unlock it. There are random times that it will unlock but it is extremely rare. The same goes for the passenger front. Most of the time it will unlock with the key fob, 10% of the time it won't. My drivers for lock/unlock switch doesn't work, but the passenger lock/unlock switch does. All doors does unlock when the car is put into park, and when I use the key fob to lock the vehicle. I know I going to have to throw some parts at this to get all this sorted out. Where should I start first?

 

[Big Mama]

Is it the same with all remotes? Are the batteries good?

 

[Doubeleive]

On my 07 Burb LT, The power door locks dont always unlock. When I use the key fob, the drivers door always unlock, and after two presses all the doors unlock except for the drivers rear door. 95% of the time it doesn't. I would then have to manually unlock it. There are random times that it will unlock but it is extremely rare. The same goes for the passenger front. Most of the time it will unlock with the key fob, 10% of the time it won't. My drivers for lock/unlock switch doesn't work, but the passenger lock/unlock switch does. All doors does unlock when the car is put into park, and when I use the key fob to lock the vehicle. I know I going to have to throw some parts at this to get all this sorted out. Where should I start first?

might be time try try some fresh lithium grease on the mechanical parts, take off the door panel and lube anything that moves or slides in there against another object, may as well do the window regulator guides while you are in there.