2003 toyota tundra door ajar light stays on

The switch or wiring at one of the doors may be bad allowing light to stay on .

The door ajar switch is likely defective, it senses the door is open ad turns on the coutesy lights as well as alerts you to the fact the door is open and the key is on (door "ajar").

First, ensure that your door does fully close and latch. Then tape a penny on the door at the spot where the plunger switch hits it to make it disengage.

http://www.f150online.com/forums/electrical-systems/193352-if-your-door-ajar-dome-light-staying-read-2.html

worked on my f-250

It can be issue with faulty sensor or a wiring issue.Troubleshooting is required.
Click the help link shown below:---
Door Ajar Light and Dome Light Remains ON? http://whoisbyme.blogspot.in/2012/06/2003-mercury-sable-door-ajar-light-and.html
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Door ajar light stays on? http://technoanswers.blogspot.com/2012/01/door-ajar-light-stays-on.html

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Thanks.

Spray wd40 on the door latches. Happened to me a few months ago. The latch gets stuck and cannot reach the necessary position to turn off lights and door ajar notification.

one of your door latch assembly is showing the door ajar,you will need to take it to Ford when it is raining and light is on for them to tell you which assembly is at fault

To temporarily solve the light problem, I taped a washer to the inside of the door where the door hits the plunger on the light switch. A permanent solution would be to drill a hole in the door at this spot and put a self taping screw in that will trigger the switch sooner. I figured out the reason the dome light stayed on is due to the courtesy light timer and the lights would have eventually gone off.

I had this problem on my 2003 explorer and took WD40 and gave the lock mechanism a good dose where it meets the clasp on the door jam. Then open and close the doors a couple of times to get them working. They get gummed up and sometimes have a tendency to stick.

you may just need to adjust your door jams they may not be closing properly, the other thing you can try is opening one door at a time and putting your finger on the switch usually in the lower l/h corner of b piller and see if the light goes off if not this may be the problem and replace the switch