2004 montie carlo: light on dash saying door ajar, dome light stays on, power locks go nuts, the ding ding noise all coming on. Any ideas?

Stuck sensor , door ajar sensor . It's part of the lock actuator inside one of the doors .
https://www.youtube.com/watch?v=ZRaFFIP7HMo

Make sure that the thumbwheel that makes dash lights brighter/dimmer is not all the way to bright. That will turn on dome light. Check fuse block for dome light relay, pull out the relay and see if light goes out, if so try replacing the relay. Possible welded contacts? If all that doesn't work you will have to try each door switch and see if you have a bad one.

Check for corroded wire connector kick pad driver side clean wire try this or change the connector

it sounds like the fan speed switch is a bad relay pack usually the lower speeds will run throw the relay pack and high bypasses it. I am not sure about your other problems but I would start by looking at the switch in the door could be a problem there.

turn off the dome light.


the door opens, it turns on the dome light, so the wire that goes from the door switch gets powered up and makes your dome light come on. if your door is closed, and you turn on the dome light, the same wire gets power and is actually sending power to your light bulb on the dash.
just ignore it , or get a diode and put it on the correct wire, and it wont allow the electricity to flow back towards the light bulb when you put the dome light on.

i must say that i feel your pain with this,, my door ajar light does the same thing but my dome light doesn't come on when the doors are open, i have to flick the switch on the dome light to make it come on. In my opion and i stress my opion it saounds like a issue with the body controller, im not sure what ford calls it but it controls all the body functions, i dont think the low coolant light is connected to the body contoller but i dont know this for sure, i think that light is controlled bny the engine ecm. some times a dealer can connect to the body controller and see if there are any fault codes for circuits that it controls and or monitors, also they can reflash or update the configeration and or calibration level cause ford release's fixes for issues all the time, same theory works for any control module on a vehicle. i dont think any of the auto parts stores have the right program to connect to bofy controlers but i could be wrong, worth looking into. i only put up with mine cause i use it as a beater, if you are worried about your dome light staying on and drianing your battery then you could pull out or disconnect the dome lights for the time being, its not a fix but just a band-aid.

do not buy without auto electrician

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.

sound like your fluid sensor may be stuck or bad if light stays on try tapping the washer motor on the resevoir if it goes out faulty sensor as for the door ajar light it might have bad connection with sensor saying the door is closed local dealer should be able to troubleshoot sensor

Have lost power to the passenger side door. Without power system doesnt recognize door closed because of no power to door ajar switch which keeps dome light on. Security light stays on because without power to rest of systems supplied by fuse it cannot tell if doors and windows closed to engage security features. Most common is for power wire to break somewhere near where it leaves to main body and enters the door.