Being an engineer, there is short somewhere. Likely in the actuator solenoid or a relay. If the fuse didn't blow, probably downstream of the fuse and the failure didnt cause an over current draw (so the fail safe being in the off direction).Fully agree with BOLDED type.
Not being familiar with how its put together, MY MONEY is
#1 on the CONNECTORS or cables,
#2 on actuator.
#3 both + fuse
In all electronics I have ever dealed with, cables and connectors are always at the top of fails, always.
Hasnt happened to be but I've have the camera and radio malfunction (not turn on) because of a loose connection. So I wouldn't rule that out either.