2012 Tahoe HLF issue

[RL1]

I have a 2012 Tahoe PPV assigned To me with the factor HLF/TLF, however these do not work when my headlights are activated. I didn’t have this issue with my 2015 Tahoe or any of my Impalas. Any insight or ideas to prevent the cut off?

 

[carguy411]

Did they work and then stop working.? Or haven’t worked at all ?

 

[RL1]

They work when the headlights aren’t on, but not when the headlights are turned on by the sensor or manually.

 

[RDT Car 25]

The HLF has a highbeam override wire that's probably connected to a parking light or headlight wire. Most of HLF's can be set up to disable the headlight flasher from flashing the highbeams when they were activated.