The dealer can't flash it. That was the start of my problems. There is no code for the flash for 2021 JL, at least so far. FCA has not been able to help. My understanding from Headlight Haven is that their harness omits the need for a flash or a Tazer. But, I appreciate the insight and I will definitely follow up.The vehicle supplies different power settings to the headlights depending on if you have them set to halogen or LED. I'd strongly recommend you get the vehicle flashed (either dealer or aftermarket programmer) to set the proper setting. You may be unintentionally damaging your lights by not supplying the power they need.