Skip the auto shop - Our mechanics make house calls

Q: Reverse, courtesy, & license plate lights are out

asked by on

The following lights aren’t working: reverse lights, courtesy lights, and license plates. I changed the bulbs and all the wiring looks okay, as far as I can tell. Also, the fuses and relays look fine. What causes this kind of trouble?

A: Its very possible there is a ground issue a...

Its very possible there is a ground issue as the only thing in common with all of these lights is ground G402.The ground wires meet up at a splice point prior to the ground point. To verify this, a voltage drop test on the ground side of the the various trunk consumers must be performed. The reading from the voltage drop test should be less than .1v. A reading higher than that indicates an issue in the ground circuit. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have access to the necessary documentation and have the training and equipment to test the ground circuit and correct the issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: The driver side reverse light won't work, only the passenger side light works. I've changed all the bulbs and I still can't get it to come on.

I would suspect that that there is a problem with the socket for the light bulb. Corrosion will build up in the bulb socket and not allow power, or ground, to get to the bulb. If the bulb is okay,...

Q: Rear running lights don't work

Hello. If just your tail and license plate lights are not working, I would first check to see if any fuses are blown. It may be possible that both of those exterior lights are on the same circuit, and the...

Q: All gear lights on, has a lot of trouble accelerating

Have the transmisison control module scanned for fault codes. There may still be something else causing some of your issues like a broken wire somewhere may a faulted module itself. Consider hiring an experienced technician like one from YourMechanic to...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.