REAR WHEEL STEERING DEVICE

PURPOSE:To prevent the sharp steering of rear wheels is trouble by installing a circuit for restricting the output supplied fo a motor driver between a motor driver for driving a rear wheel steering mechanism and a microprocessor for back-up which outputs a phase selecting signal to the motor driver. CONSTITUTION:A plurality of motors M1 and M2 for driving a rear wheel steering mechanism are driven by a plurality of motor drivers 5 and 6 of an electronic controller 9. Each phase selecting signal is outputted to the motor drivers 5 and 6 by a microprocessor 3 for back-up, and output is performed, selecting the phase selection pattern of the phase selecting signal in a prescribed timing. By a restricting circuit 102 arranged between the microprocessor 3 for back-up and the motor drivers 5 and 6, the output supplied to each motor driver 5, 6 is restricted when the phase selecting signal having the frequency over a prescribed frequency is inputted.