International LT625 headlights stay on all the tine

[victory26]

Hello everybody,
I have a 2021 International LT625 that has some weird headlights issue. The headlights stay on all the time with both the low and high beams at the same time, even though the switch is in the off position. The headlights stay on even if you unplug the light switch completely. I tried swapping the light switch from a sister truck that is exactly the same, comes from the same fleet. Also swapped the body controller from that same sister truck, all with no luck. If somebody had same issue please pinpoint me in the right direction. Than you!