Passenger door light remains on; all interior lights remain on
While driving passenger door warning light came on and all interior lights came on. Checked all doors, incl tailgate, and all were firmly shut. Auto door lock also stopped working; actuator replaced 1 year ago. Can turn interior lights off manually, but dash lights and other control lights are off or very dim now. Interior lights on delay no longer go off. Either must drive with interior lights on or turn off manually and can't see dash/control lights.
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This is because the switch mechanism on the door frame has failed and needs to be replaced. Hence the switch remains on and power will continue to flow to the interior lights until you switch them to full manual mode. The door warning light will also show as open because the warning light is operated off the same switch.
More than likely the door switch is shorted to ground. Look on the hinge side of the door at a little button that is pressed in when the door closes on it(thats what turns on your interior lights when a door is opened). Check both driver and passenger buttons. You can get screw in replacements at any auto parts store, and maybe even one of the sales personnel will install it for you. Just takes a minute.
I am not sure about the 1992 since they have newer dashboard than my 86.
Anyway, I got that same intermittent issue on mine, sometime the battery was drawn in the morning sometime not, very frustrating, until i noticed that the interior light sometime was not going out as it should after 30 seconds when leaving the car in the evening.
I eventually found the timer module after removing the upper dash pad, on the passenger side. The module was just partially unplugged. Put it back in and never got problem anymore (was 6 years ago).
When my "door ajar" light was on it was because the liftgate sensors (switches) indicated that the gate was open, even thought it wasn't. I took off the plastic trim, and took out the sensors - but that isn't necessary. Just soak with the switches with silicone spray, and see if that helps. There is one on each side of the liftgate - I believe both must indicate "closed" for the light to go off.
I have gotten replacement motors at Checkers for both driver and passenger doors - so now I have lifetime replacement motors.. The first time you replace them, a little drilling is needed on the door sheet metal, but it will not show up once the trim is reinstalled. This repair is a little involved, but well within the capability of a novice mechanic.