When I switch the stick to R on my automatic gear, the backup lights, monitor and alarm sometimes don't work, sometimes do. It feels as if it's random when there's current in the wires.
When they don't, I shift the stick up and down multiple times until they work, but sometimes it doesn't help as well.
At the repair shop they said it's on the transmission itself, but I find it pretty weird.
Sorry for my English by the way.