Looking for some guidance, I have a 2012 FX4 with auto headlamps. Currently have a custom retrofit package. Moriomto halogen to HID conversion harness, Morimoto XB 55w ballasts, Osram CBI bulbs.
**when i have my headlights set on auto, at night, my dash lights will dim as they would when the headlights come on, however they do not. if i flick my high beams for just a split second, the low beams would then come on and stay on.
**as of last night, i can hold my high beams on for any period of time and they are fine, however when i let off of them (headlights turned to on or auto mode) the low beams are on for a split second then turn off. All fuses seem to be fine, tried swapping ballasts, no luck. not sure where to check from here. any guidance would be greatly appreciated. let me know if i'm missing any crucial info. thanks!

 

Could possibly be the halogen to HID harness. That seems to be the culprit more times than not when something goes wrong.

 

I've ordered a new harness, just seems very strange to me that high beams will fire but low beams will not, the only thing moving is the cutoff shield, unless I'm mistaken....?

 

You are correct. The only thing moving inside the housing is the shield cutoff. However, your issue sounds electrical to me. Maybe there’s a short. Did you examine your harness and other plugs? I’d be willing to bet something either got wet or corroded.

Just my .02 but I’ll be surprised if the harness doesn’t fix the issue.