The problem is a stuck switch inside the door, attached to the lock. Decades ago the switch was a button on the inside of the kick panel. A button that could be pressed with your toe if you wanted to cut off the light while the door was open. Having a "better idea" they moved it to inside the door where it is harder to get to and replace. Try this first. Remove the door panel and visually locate the switch. Disconnect the battery. Flood the switch (via spray) with electrical contact cleaner, move the switch up and down. Then use something like WD 40 and do the same thing. . You may work it loose. It's worked for me several times. Try what is simple first.
2 people found this helpful.