Headlight issue...

[T Fletcher]

Hello all,

 

I've done a ton of research and found some issue but not the exact issue I'm having.

 

I have a 2019 Silverado 1500 RST. It has the led headlights. The PF low beam works but not the drl or turn signal, the DF turn signal and running light work but not the low beam.

 

All wires seam good from what I can tell. Ground is good. Switch is good. I swapped lights and same issue. 

 

The only light on the dash is a RF turn signal failure. I change the bulb out twice. Dielectric Grease on all.connections, just in case. 

 

Can't figure it out. Any help would be appreciated.

Edited April 12, 2025 by T Fletcher

[Transient]

Have you checked the fuses?

[T Fletcher]

Yes, I've checked fuses and relays. All good. 

[silveradosid]

you plugged the right headlight into the left side plug and the right headlight did the same as the left was doing, then each headlight has is own control module and the command comes from the bcm. i would say your bcm has a problem, you could try and have it reprogrammed. did you try disconnecting the battery for an hour

[T Fletcher]

I only see one control module, not one for each side. I have the front end torn apart right now. The only control module is the drivers side behind the headlight right above the wheel well. 

 

Same issue if i swap lights. Yes, I disconnected the battery for a while and no changes. Check for cut or loose wires. Nothing that I could find.

[silveradosid]

interesting, all the wiring schematics show a module inside of each headlight, i know gmc is this way. i have a 2020 silverado rst with led headlight, i will have a look this afternoon. even gm parts show a module for each light. can you take a pic of the module on your truck

[silveradosid]

does the back of the light look like this

[Paul8556]

Did you ever find a resolution to this?

my 2019 Silverado 1500 is showing the exact same headlights issues with the exact same symptoms. 
would help a ton if anyone has any advice on this or better yet a known solution..