Patent ID: 7549351

Claim:
A shift range switching device of an automatic transmission mounted on a vehicle, comprising: shift means for switching a shift position to one of a plurality of successive shift positions by rotating an actuator; storage means for storing said one of shift positions resulting from switching by said shift means; first restriction means for restricting, in a first shift position corresponding to one end position among said plurality of successive shift positions, rotation of said actuator in a direction where no adjacent shift position is present; and control means for controlling rotation of said actuator, said control means including first position setting means for setting, as a first reference position in said first shift position, a position where the rotation of said actuator is stopped by said first restriction means, electric power supply control means for permitting shut-off of electric power supply to said shift range switching device for said first shift position, and reference position re-setting means for setting again said first reference position by said first position setting means, when electric power supply is resumed after said shut-off of electric power supply, on the condition that said shift position stored in said storage means is unknown.