The door ajar lights and signal, dome lights, blinkers and caution/hazard lights turn on randomly while I am driving and/or will not stop in my Dodge Caravan 2005 mini-van. I know nothing about cars and not sure what the problems is or how expoensive this is/will be to fix? I figure there must be a wiring issue somewhere...

It will be under the dash somewhere near the steering column. Turn on hazard blinker and feel under dash.

The door switch doesn't go to the dome lights , the switch (door ajar switch ) is an input to the SMJ - smart junction box or body control module take your pick .
Principles of Operation
When the SJB detects a request for lighting, it turns on the interior lamps by supplying power to the lamps. The request for lighting can be an open door signal from a door ajar switch, an interior lighting on command from the instrument panel dimmer switch or an unlock command from a remote keyless entry (RKE) transmitter.
The door ajar switches are hard-wired directly to the SJB. The 2 door ajar switches are normally closed when the doors are closed. The decklid ajar switch is normally closed when the decklid is closed. All door ajar switches receive voltage from the SJB and each has its own ground circuit.
The instrument panel dimmer switch receives a ground signal from the SJB. The instrument panel dimmer switch provides variable resistance for backlighting the instrument cluster and a toggle ON/OFF function for the interior lights.
The RKE receiver is contained inside the SJB. When the SJB receives an unlock request from an RKE transmitter, it unlocks the doors and turns on the interior lamps. There could be DTC'S diagnostic trouble codes stored in the SJB ! You can not access these codes with a OBD2 code reader , need a factory scan tool .
B1319 Driver Door Ajar Circuit Failure Go To Pinpoint Test D . B1327 Passenger Door Ajar Circuit Failure Go To Pinpoint Test D . B2021 Dome Lamp Input Return Circuit Failure Go To Pinpoint Test A . B2550 Dome Lamp Output Circuit Short to Ground Go To Pinpoint Test A . B2554 Dome Lamp Output Circuit Failure Go To Pinpoint Test D . Do you know B-codes -body control .
Your best bet is to take to a ASE certified repair facility or a Ford dealer .

Check door switch connection and operation.
If the door switch is part of the door lock mechanism, within the door itself, then remove door panel, disconnect the mechanism's electrical connector and re-check that the interior light no longer comes on with that door ajar. If it doesn't, then you likely have a faulty door lock mechanism, which you will have to replace.
This faulty switch will also have the affect on your random central locking function.


This is not likely connected to the engine performance issue.

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

The turn signal flasher is bad. It is built into the hazard switch. Replace the hazard switch. The next time the turn signals quit turn the hazard switch on and off a few times and see if they start working.

all this is controlled by a fuse, i can't remember if it's in the dash by the driver door or under the hood

Have you checked the contacts to make sure they have good contact with the bulb base? I have a 1995 Ford Contour. The turn signal went out. I replaced the bulb and it would work when it wanted to. I checked the contacts and sure enough they weren't making good contact with the bulb. I took a screwdiver and slightly bent the contacts a little. It has worked good ever since.

ford have a inner switch that does not work with the door switch dome light. one of the switch could be broken.. most of the time it is the rear tail gate that give the problem..

Signal flasher in fuse panel black and square the one on the right is signal