2007 GMC Yukon Passenger side lighting not working after LED install

[Joshua609]

Hey boys got an issue here, I just installed new LED tail lights and headlights and third brake light on my 2007 GMC Yukon and having major issues. I installed the taillights and 3rd break light with no issues, they worked great. Installed the first headlight, no issues get to the passenger headlight and the running light doesn’t work, ok probably the light right? Well I installed the old light back and it’s now doing the same thing. Hmmm go back to the new light inspected the wiring and installed it again, still doesn’t work. Alright I’ll just order a new one. Walk to the back of the truck now the running light/ brake light on passenger side and 3rd brake light not working. I replaced every fuse I could possibly find related to the lighting somebody please shed some guidance

 

[Joshua609]

Update #1: Brake lights work, it has to be the passenger running lights. I bypassed fuse #26 and she started smokin so I believe I have a short, anyone have a good place to look?

 

[Joseph Garcia]

I would start with the wire harness and connector that connects to the passenger side lights, since the problem was not there before you started this project.

 

[petethepug]

These vehicles are susceptible to led lights whether they’re “can bus safe” or “built in resistor”

The only way to verify if the leds are wreaking havoc on your BCM is to replace all the incandescent bulbs and disconnect the battery for a few minutes.

If all goes back to normal, you got lucky. If not, only troubleshoot with the incandescent bulbs installed.

 

[Doubeleive]

Update #1: Brake lights work, it has to be the passenger running lights. I bypassed fuse #26 and she started smokin so I believe I have a short, anyone have a good place to look?

bypassed the fuse.......... faceplant, should be needless to say "never do that" unless you have a barrel full of money
the yukons are finicky bastards especially with the headlight harness.
I would start by checking the polarity of your led bulbs (all of them and install correctly per vehicle polarity) i say this because you can have the bulb work on one side and install the other side and now suddenly it doesn't work
and expect hyperflash unless you install resistors and that is whole different ball of wax to tackle, because that headlight harness is a magical device that changes what comes in into something else that comes out, I still am not sure what the heck it really does inside the divider
it also uses the low beam as a DRL at a lower voltage than when the low beam is on and the bulb is a dual filament for low/high beam
check your new LED bulbs and see if they work with a 9v battery, if not that may be part of the issue some LED's will work on lower voltage and some do not.