I cannot get the switches to change when looking at the map. I have to stop, get off and manually toss the switches. How is this supposed to work?
When you press ESC you pause the game. That is why you can't change the switches in map that you can access thru the ESC menu. What you need to do is press 9 while normally playing and change the switches there.
I had no idea it could even be done using the map. TBH I quite like jumping down from the cab and getting my hands dirty.