Shift-by-wire control device

1. A shift-by-wire control device that drives, on a basis of an electrical signal corresponding to a shift range selected by a shift lever, an actuator to perform a shift change, the shift-by-wire control device comprising:

a first detector that detects a first vehicle state attributed to a behavior of a driver driving a vehicle to be equipped with the shift-by-wire control device;

a second detector that detects a second vehicle state, the second vehicle state being attributed to a behavior of the driver and being different from the first vehicle state;

a malfunction determining unit that determines that the first detector is malfunctioning, on a condition that the first detector fails to detect a change in the first vehicle state,

an auto parking control unit that executes an auto parking control irrespective of the shift range selected by the shift lever, on conditions that a detection result derived from the first detector and a detection result derived from the second detector satisfy respective predetermined conditions, and refrains from executing the auto parking control on a condition that the first detector is determined by the malfunction determining unit as malfunctioning, the auto parking control allowing the shift range to be switched to a parking range.

2. The shift-by-wire control device according to claim 1 , wherein

the first detector comprises a seat belt switch that detects a fastened state of a seat belt by the driver,

the second detector comprises a door switch that detects an open state and a closed state of a door of the vehicle, and

the malfunction determining unit determines that the seat belt switch is malfunctioning, on a condition that the malfunction determining unit senses no change in the detection result derived from the seat belt switch, during a time period from a timing at which the driver enters the vehicle up to a timing at which a running speed of the vehicle reaches a predetermined speed.