Q: Dome light and trunk light not working all fuses are good

asked by on

ive checked fuses and the dome lights and trunk light are still not coming on theres no power to the dome light i check with tester is there any switches or anything that could be turned off

My car has 160000 miles.
My car has an automatic transmission.

Your lights have a BCM (Body Control Module) that can control them. It is setup this way to save your battery if your interior lights are left on. The dome light is grounded by the BCM and your trunk light is powered by a relay that the BCM can turn on or off. There is a lot of electronics involved with this system and a scanner would be very helpful. There is one thing you can try that may or may not be helpful. With the key on, open and close your doors one at a time and see if the door ajar light comes on on your dash. All of the door switches go through the BCM. Then the BCM sends this information to the instrument cluster via a CAN (Computer Area Network). This is simply one test that might reveal some answers for you.

Unfortunately due to the nature of dealing with computer modules, it is hard to give detailed advice here. If you have access to a professional level scanner, you will be able to use the scanner to see what information is being relayed from module to module. There is quite a learning curve to such a venture though. I recommend you have this electrical issue diagnosed by a certified technician, like one from YourMechanic.

Good luck and be patient with this one!

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Dome light and trunk light not working all fuses are good

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do I turn on the sun visor mirror light?

The sun visor mirror light will automatically turn on when the mirror is accessed.

Q: Headlights

If your vehicle was equipped with halogen capsule bulbs, then the high and low beam functions are in separate bulb assemblies. If your vehicle was equipped with HID lighting, high and low beam are integrated in one assembly. Problems with...

Q: im having trouble looking for a replacement Trans for my Chevy Impala 2006 police pack 3.9l any other transmission i can use?

Hi Johnatan. Thanks for contacting us today. It's recommended to replace any OEM transmission with the same type of system from the same year, make and model of vehicle. You might find luck with a local transmission shop or ask...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...