I HAD THE SAME PROBLEM AND I REFUSED TO SPEND $90.00/HR TO HAVE IT FIXED. SPRAY SOME WD-40 IN THE DOOR LOCK MECHANISM, OPEN AND CLOSE IT A FEW TIMES AND IT SHOULD WORK.
Check all the door and light switches, they are turned on by twisting the light switch to the left, also the pin switches on the doors will activate the cabin lights.
Fuse number 4 disconnects the doors switch from turning on the interior lights
Well they are interior lights. Usually lights light up (assuming there is power to them and they aren't burnt out.
Lights inside the car. Dome light, courtesy light, etc.
The interior light switch on the ceiling of the car might have them turned off, or there may be some electrical short causing the problem.
The doors will have switches that control them, the light switch also has control. Depending on the year, the pull knob turns to control dash light intensity and interior lighting. On newer models there is a dial under the switch that does the controling of these lights, on some models there is a button next to the switch that is an override button to stop the lights from going on when the doors open. Let me know if you need more help as I will try my best.
Either the light switch is set to have the interior lights on or one of your doors is not closing properly (or at least the sensor thinks it isn't closed).
There is a knob on your dashboard that you can turn to set the brightness of your dash lights and interior lights. If you have this knob turned all the way down, the interior light will not come on when you open the doors, and your dashboard lights will be dark. If this is not the solution to your problem, look for a blown fuse in your fuse box.
Check your guage light dimmer wheel ( just to the right of your headlight switch ) to see if it has been rotated all the way up - that turns on your interior lights. Also , if you are getting a door ajar warning light in your gauge cluster you could have a door ajar switch sticking inside one of your doors , liftgate , or for the liftgate glass
locate the fuse to the interior lights and remove it. On our 98 Explorer you turn the dash light adjustment switch off, next to the headlight switch.
It stays on
Two possibilities; the dash switch is set to ON that operates the interior lights, or one or more of the switches that detect a door open has failed.