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Took possession of a 2021 in February. The interior, frunk and trunk courtesy lights never come on. Can someone tell me where the fuse for this circuit is located? Owners manual does not show which fuse controls this circuit.
Glen did you get an answer to this? My dome/map lights, Home link and sun visor lights do not come on. I don't want to pull every fuse to find out which one.
Glen did you get an answer to this? My dome/map lights, Home link and sun visor lights do not come on. I don't want to pull every fuse to find out which one.
Thanks
Yes I did and I decided to purchase extended warranty for first time ever for a car. Local dealer tech had the car for a total of 5 days (off and on I'm sure) and with the help of a factory engineer determined I have a faulty main wiring harness in the dashboard. Will take a great deal of labor hours to replace as he has to pull the entire dashboard out of the car. The service manager told me repair would be several thousand dollars, thank God it is still under the btb warranty.
I also have an occasional issue of moisture in the headlights as many others have reported in the forum, I will deal with that before the btb warranty expires as the headlight assemblies $1,700 part are not covered under the GM Platinum extended warranty.
Good luck with your dealer, I hope you are under warranty.
Took possession of a 2021 in February. The interior, frunk and trunk courtesy lights never come on. Can someone tell me where the fuse for this circuit is located? Owners manual does not show which fuse controls this circuit.
Thanks in advance, this is a wonderful forum!
Glenn
You are not going to find a single fuse for those. They are controlled by the BCM. There are some fuses involved. The schematics show them at top of the illustration. F23DA, F46DA, and F31DA. From what I can tell, the DA means its fuse found in the front fuse block behind the glove box door. The number refers to the fuse number you will find in your owners manual for that front fuse block. F23DA is fuse 23, listed as Body Control Module 2. F31DA is fuse 31, Body Control Module 1. F46DA is fuse 46, Body Control Module 3.
I have an idea that you have a software issue, or an issue with the BCM. Attached are the schematics. You can find the lights you mentioned, trace them back to the switch shown in the BCM, where you will find a fuse listed. The fuse is not inside of the BCM of course. I think though it means that particular switch is protected by the indicated fuse.
Thanks Glen. Sounds like a major issue. I am glad you still have warranty coverage. I am about to run out of factory warranty. I bought a warranty from Endurance. I may have to take mine to the dealer but I don't want too. Good luck with your car.
Thanks for your response Andy. I have pulled and checked every fuse in both the front and rear fuse boxes. None were bad. I guess the next still is to go to the dealer.
In case anyone encounters a similar problem. The issue was the Homelink, sun visors and dome lights did not work. The dealer found the wire connection for the driver sun visor was damage. He replaced the part and everything is good now.
In case anyone encounters a similar problem. The issue was the Homelink, sun visors and dome lights did not work. The dealer found the wire connection for the driver sun visor was damage. He replaced the part and everything is good now.
Did they mention if there was a code? I'm betting there was one. Not all codes will result in a CEL (o MIL) on the dash, so you would not necessarily see one. Code B1A2F11 or B1A2F13 indicate a short or open circuit, respectively, in circuit no. 4786 which would be consistent with a damaged wire - not sure if you had a short or open circuit - but either one would be detectable. That is a courtesy light circuit that include Sunshade L&R, Center Reading Lamp L&R, and Instrument Panel Courtesy Light. If you go back and look at the schematic I posted earlier, that circuit shows up. If the code is set, "The BCM will disable control circuit 4786 and all lamps on the circuit will be inoperative," which is consistent with what you observed. So, I'm guessing you service department found this quickly because there was code. I was able to find it in the Service Manual by searching for "Sunshade".
New 2021 owner courtesy light problem
