This can be tricky, depending on the car.
Older cars usually have separate devices for making a noise for the turn signal flasher, a seat belt buzzer, and the door buzzer/chime.
Newer cars may have an electronic module that includes several warning tones in one.
Sometimes you can get a schematic diagram of your cars electrical wiring and figure out where the chime is located and if it is a separate unit from other warning tones or not. Sometimes you can simply unplug some wiring connector to disable a device. However, if the unit is an all-in-one electronic module, disabling the one chime may be really difficult.
You might want to cut a wire, but keep in mind the door switch wiring also signals the dome lights to go on...and you probably don't want to interfere with that -- so be cautious if you go that route.
Good luck. If nothing else a shop that specializes in car wiring might be able to take care of this without too much trouble and save you a lot of time.
Chime
if you have the owner book that came with the vehicle, you can find in the book how to disable the door chime
There is no dedicated fuse for the door chime.
Each door has an ajar sensor. Disconnect it and see if it works. If it does not work, just unplug the ajar alarm, which is a small black box, from the panel to disable it.
You should be able to find a little rubber covered button somewhere on the door frame - you should be able to pull this out and disconnect the wires that go into the little button.
To disable the door chime on a Honda Ridgeline, locate the vehicle's fuse box, which is usually found under the dashboard or in the engine compartment. Identify the fuse associated with the door chime; this information can be found in the owner's manual. Remove the fuse to stop the chime from sounding when the doors are open. Keep in mind this will disable the chime entirely, so be cautious as it may affect other functions.
The door chime on a 2000 Ford F250 can be disabled by removing the fuse or pulling the wiring harness. The chime is automatically trigger each time the door is opened or is left open
The only thing I can think of is to glue the button in the door jamb.
The driver's side door ajar sensor may not be working.
One probably cause is that the door is slightly ajar. Another is a faulty door switch ... if the contacts aren't closing properly, leaving the circuit open with the door shut securely, the door chime will sound.
One of the door ajar switches is showing an open door. The switches are part of the latches inside the door.
I had a problem with my door ajar switch staying on in a 98 EXPO and when I took it to the dealer they just sprayed W-D 40 in the locking mechanism for the door. I guess there is a senso in there that turns the door ajar light on and the w-d 40 makes it get contact.