Door Locking Issues

[kamposs]

I have a 2002 Silverado 2500HD - the key fob only locks the drivers door. If I manually lock all the doors, the key fob will unlock all the doors.

The controls in the car - driver side unlocks all, but only locks driver door. Passenger side unlocks all, but only locks driver door as well.

I took the doors apart, figured maybe it was an actuator, swapped the back, driver side actuator, with drivers door actuator, and it worked exactly the same. So I believe all the actuators are fine. I am guessing it is an electrical problem. I checked all the "Door Lock" Fuses, and they all are fine.

Is there a way to reset the bcm, or whatever controls this? I just unplugged the batteries and am waiting for that to reset everything, but I don't think it will work. What else can I check? Do I have to get out the schematics and chase wires? Any help would be appreciated!

[Dannp]

Hi, I'm new here. I'm an Autobody technician and have had similar issues with customers vehicles, not a Chev truck but other makes. Since I haven't run across your particular problem with that make and modelet I can only make a suggestion. I do know that certain vehicles power and control all functions such as power windows and locks from the left front or drivers door. Some vehicles if you disconnect the left front switch nothing else will work. The problem could be in the left front switch assembly and it is stopping the other doors from working. If you could get another switch cheaply or borrow one from another truck you know works, you could see if that is the problem. You may also be able to see if there is a main power or feed wire from this switch. I hope that may help you.