My license plate lights were out, so I changed the bulbs. When they still didn't work, I found they did work when the trunk was open, but went out when the trunk was closed.Of course it is closed when driving so this is a problem.
SOURCE: License Plate light and tail lights on trunk led not working.
I had the same problem on a 2008 Civic. It turns out it was a poor wiring harness design. The harness was being pinched as the trunk lid opens and closes. In the wire bundle, there is a crimp connector where 3 wires connects to 1 wire. The 1 wire in the crimp came loose. I reconnected everything with a new crimp connector, taped up the wire loom, and everything worked once again.
SOURCE: license plate lights go out when the trunk is shut
try looking at the wiring from the light and fallow it back to the fuse, sounds like a short in the wires if not change you fuse, you can find it by looking in your owners manual,
SOURCE: How do I replace the license plate bulbs?
The license plate lights are accessed by unscrewing the lens. The backup lightbulbs are accessed with the trunk lid open, behind the cover.
Follow
the Steps on how to replace license plate light on your car.
1.
Open the trunk and locate the trunk liner retainer clips.Use the
Phillips head screwdriver to loosen the center plastic screw of the
retainer clip about 1/4 turn, just enough to raise the head of the
screw from the base of the clip. Pull the screw up, and lift the
clip out of the liner. Use a flathead screwdriver to help pry it
out. Remove enough of the clips to allow access to the license plate
light sockets. Pull the liner back.
2.
Remove the emergency trunk release handle by popping off the top
cover of the handle. Use the needle nose pliers to gently squeeze
the prongs on the shaft, while removing the handle.
3.
Unplug the wire harness from the license plate light bulb socket the
release clip on the side of the outlet.Twist the license plate light
bulb socket 1/4 turn counterclockwise, using the needle nose pliers
again. Do not apply too much pressure to the pliers; you may damage
the socket.
4.
Remove the bulb from the socket, and replace it with a new one.
5.
Replace the socket into the socket assembly, and plug the wire
harness back in. Test the bulb by turning on the lights of the
Corolla, then turn them off again.
6.
Replace the trunk emergency release handle, and replace the hood
liner and the retainer clips. Remove the old bulb and tools, and
close the trunk.
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