Skip the auto shop - Our mechanics make house calls

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.

A: Your lights have a BCM (Body Control Module...

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 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

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: How does the ceiling light work?

Your Accord features a number of convenience lights designed to make it easier to see inside your car in low-light situations. The ceiling light (also called a dome light) is one of these. It has three settings here: On...

Q: WHAT IS THE DIAGNOSTIC AND HOW CAN I FIX THIS,,PLEASE

Hi there: Unfortunately, without physically inspecting your 2005 Chevy Impala, it's virtually impossible to correctly diagnose this issue. However, engine stumbling or acceleration issues can be caused by faulty fuel and air system components like mass air flow sensors, O2...

Q: Car doesn't run right - 2005 Chevrolet Impala

Hello and thank you for contacting YourMechanic. You will need the check the idle air control valve (IAC). It is located just under the throttle body where the throttle plate is. Unplug the harness and check the plug for any...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.