Probably a blown fuse or bad relay.
if your cig light is not working as well, the fuse is in the glove box top and last in that row, had the same problom.
Depends of course on the vehicle but there are different fuses for the locks than the lights. My suggestion is to open the door so the lights are on and pull relays from the fuse block under the hood till they go out. This should disable both auto locks and dome lights.
Check a fuse called "courtesy" or "Interior" or something like that. It depends on the auto manufacturer.
I would check the wire harness and conectors to the doors because the poswer locks, windows, and mirrors are all conected through that harness.
i am having the same problem with my galant.
yes, it is a fuse it will be labled int. lights/ horn on the fuse box
Possibe blown fuse
Bad fuse
Wipers, door locks, lights, alarm if equippedWipers, door locks, lights, alarm if equipped
Fuse number 23 in the passenger compartment box is blown. It caused the following devices to stop working: Door lock switches (but not the locks), Interior lights, radio lights, A/C climate control, overhead console quit.
Some vehicles courtesy fuse circuit (locks, windows, interior light) is tied into the radio.
try the fuse box look for blown fuse