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This problem is caused by one of the door ajar sensing switches being defective, it is a common fault in Many Ford cars and light trucks. Each door has a switch and two at the tail gate door. The switches are attached to the side of the door latch and very hard to replace, since you would most likely have to detrim at least two doors to find the bad switch the most prudent thing to do is have the dealer scan the door ajar waring system, the scan will indicate exactly which switch has the problem.
The door ajar switch is located inside the rear door face along with the latch. They can tend to get dirty and sticky over time. Using your favorite petroleum based lubricating spray, shoot it directly into the door latch area, being very liberal. Open and close your doors several times to make sure the switch is working freely. You should do this one door at a time so you can diagnose which door is causing the issue in case it resurfaces. Should be good to go.
There is a switch that connects to the door latch inside the door. They can get sticky or come loose causing your complaint. Usually it is the drivers door since that door gets used the most. The door panel has to come off to access the switch. Sometimes you can remove the dome light fuse to take care of the light and indicator until it gets repaired.
I have a 2002 Explorer as well. It mite be that the keyless entry box needs 2 be replaced. I had a similar problem with the door ajar thing and sum other lighting issues and that was the problem. Got it fixed and now I have no problems. The part costs like $25 but the labor, idk. A family member did it 4 me. Hope that helps. Good luck.
Ford Explorer since 1995 has been using an in-door switch for the door jamb. Older versions used a plunger that you could easily test with with your fingers. The common problem is that the switch is not closed, this will cause your dome lite to be on, door ajar light on, and will malfunction any aftermarket auto alarm. Replace the switch, this is a known Ford problem.
the wiring for the dome light, door ajar and radio is most likely crossed with the brake light wires causeing it to turn off power or on when pressing the brakes giving electricity to the lights and then it could be cutting off the power to the radio