Interior Lamp problems?

SHANASH44

MEMBER
2004 CHEVROLET AVALANCHE
5.8L
V8
4WD
AUTOMATIC
290,000 MILES

I recently had to replace the overhead storage pocket as the old one had broken at the screw and was hanging free. After replacing I am now having an issue where only the front reading lamps turn on when pressing the buttons for them. The rear lamps buttons will show that the cargo lamp has turned on but will not illuminate the bed lamp. Vanity mirror lights no longer work, and the cargo bed light switch doesn't work either. I'm hoping I didn't fry something expensive as the new overhead box has the homelink garage door openers and the old one didn't. They had the same connector, so I assumed it was plug and play which I am now learning is probably not the case. Any help would be fantastic in solving this issue so I can have my lights and bed lamp back to working again.

Tuesday, September 24th, 2024 AT 4:05 PM

3 Replies

ERNESTCLARK93

MECHANIC
8 POSTS

Have you checked the fuses yet? When more than one component stops working at the same time, that tells you it's most likely the fuse controlling that circuit. Your fuse box is located under the hood. Check fuse 16 and 51.
There's usually a plastic tweezers tool clipped somewhere inside the fuse box. Use that to remove the fuses. If it's missing, you can use metal needle nose pliers but be careful not to damage the fuse.
You should easily be able to see if the silver trace inside the fuse is intact or blown. If blown, make sure you replace the fuse with the exact rating. Not doing so is a fire hazard.
If this does not happen to solve your problem, please feel free to reply, and I'll attempt to assist you further.

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Wednesday, September 25th, 2024 AT 9:27 AM

SHANASH44

MEMBER
2 POSTS

Hey sorry for the late reply to this. I've gone through and checked fuses and connections. I'm still having the issue of passenger lights not working and triggering the cargo lamp without actually turning it on. I am sending a video with the issue.

Side note, any chance I can get a schematic of the center overhead console? I'm starting to think mine is wired wrong. It has the 5-point connector with the tan, black and orange wires as well as white and black for the homelink garage opener

Video (Click to make bigger)

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Wednesday, October 16th, 2024 AT 12:57 PM

KEN L

MASTER CERTIFIED MECHANIC
50,520 POSTS

Thanks for the video, I would check the round at left rear quarter panel (G410), if that is okay it seems like the BCM went out but to be sure we can run a CAN scan. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Here is the wiring diagrams for the cargo lights so you can see how the system works, and I marked the ground you need to check, and how to replace the BCM in case a code is stored for it. You can get a preprogrammed unit by searching Google or Ebay. You might want to try a hard system reboot as well.

https://www.2carpros.com/articles/step-by-step-guide-performing-a-hard-system-reboot-for-your-vehicles-electronics-systems

Check out the images (below). Please let us know what happens.

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