Reverse Switch

In spite of re-connecting trans-axle back up lights terminal to plus circuitry on ignition coil after checking engine room fuse capsule, they don't put on, how come?
The terminals on reverse switch may be opened or the switch itself fracture?
New parts costs 1,800yen, so the parts replacement may be one of the choice.
The maintenance on the reverse switch circuitry will be performed on coming Thursday.