So my 2000 ex has the door ajar light on. I have narrowed it down to the drivers side rear door. I have sprayed wd40 and pb blaster into the latch and its still on.
I have taken the panel off and sprayed everything inside. I pulled apart the wires running inside the door and tried doing some experimenting with twisting wires together, Hoping to close off the circuit.
I am out of ideas and its driving me nuts.

 

Just curious how you narrowed it down to that one?

 

It was a long and drawn out process, Once all the doors were shut and after several minutes the battery saver feature would shut off the lights. Then I would open a door. If the lights came back on I knew it wasn't that door. When I finally got to that door and reopened it the lights did not come back on.

 

How would a door that does not actuate the lights make the door ajar light stay on? I thought they were switched by the same switch.

 

He's waiting for the battery saver to kill the lights before opening a door. the truck still thinks the door is open even after it kills the lights, it just kills the lights to save the battery. If he opens a door that the truck thinks is closed, the lights come back on and the timer restarts. If he opens a door that the truck thinks is already open, the lights stay off.

This method is a long drawn out process. Basically, you make sure all doors are closed, then wait for the lights to go out (about 45 min or so i believe). then you open a door, if the lights come on, you close it and wait for the timer to expire again, then go on to the next door, and repeat the process until you find the door or doors that dont turn the light on.

To the OP, in case you werent aware, the top part of the back hatch as 2 switches in it, one on each side. Im not sure if they're wired in series or 2 separate switch circuits. If they are separate circuits, then your method of locating the door wont locate this as a bad door as the 1 good switch would still trip the lights. Also, I know the back hatch switches are part of the latching mechanism. I think the switches are part of the latches in the other doors as well but someone else would have to confirm that. In the case of the ex I drive, both switches in the back hatch werent working. One of them I managed to bring back to life with WD-40 and liquid graphite for locks and working it quite a bit, the other i ended up bypassing with a paperclip and some electrical tape as it was gone for good.

 

I checked the back hatch and it always turned the lights back on. So i dont think I have a problem there,