Rear passenger power door locks don't work.

[PavementPounder]

1987 Suburban. They have not worked as long as I have owned it. The barn door power lock worked when I got it, but no longer. The passenger doors are the more annoying issue that I am gaining motivation to chase. Common problem? Corroded connectors? Ground that goes bad or something?

It isn't a mechanical linkage problem - the lock knob functions normally by hand.

[nm4x4]

Mine did the same thing. It was a broken wire inside the rubber boot where the door closes. I had to remove the door panel and trim piece between the two doors to fish the wires in and out. Use a multi-meter to shoot the wires first, I knew I had a bad wire by checking with a meter first!