The 4x4 car and 4x4 low works but does not work on 4x4 Hight

What is your question?

When I set the switch to 4x4 auto or on the 4x4 low it works well when I put it on 4x4 Hight light 4x4 flashes does not want to board on the 4x4

What makes this problem better or worse?

When I set the switch to 4x4 auto or on the 4x4 low it works well when I put it on 4x4 Hight light 4x4 flashes does not want to board on the 4x4