I have a 03 Dakota Quad Cab that is supposed to have automatic locks. Everything works accordingly except for my rear driver's side door which will not respond to the locking or unlocking from either the driver's controls or the remote. However, the window and speakers work fine (but i did realize my speaker was dead until i was inspecting the problem, which vibrations had apparently disconnected the speaker; no problems now though).

I can manually lock the door and unlock it, but it's annoying that it doesn't work on an 03...

Anyone had similar issues or know of anything for me to check for?

 

I'd guess the lock actuator there might have died .... Pull the inner panel and see if it's getting voltage when you hit the lock unlock

 

Try to check and see if the relay for them is good, it should be located in the relay center, its possible one part of it went out, and is causing this to happen, I have seen this before, other than that, check each one of the motors for this, you can do this by removing the door panel, and applying 12 volts of power to them, if they work, its the relay gone bad, good luck hope this helps.