Steering assist control system and steering assist control method

A steering assist control system that causes a plurality of actuator units to control an assist torque that provides assistance in steering in accordance with a turning operation on a steering wheel in a vehicle having an information presentation apparatus, the steering assist control system comprising:

• a monitoring part that monitors the actuator units;
• a torque control part that reduces, in a case of a one-unit anomaly in which the monitoring part determines that one of the actuator units is anomalous and a remaining one of the actuator units is normal, the assist torque that results from combining output torques from all the actuator units so that the assist torque is smaller than an assist torque output before occurrence of the one-unit anomaly, in response to the turning operation being performed on the steering wheel;
• and
• a warning control part controls the information presentation apparatus, so that a warning sound is presented aurally inside the vehicle in response to the torque control part reducing the assist torque,
• wherein:
• in the case of the one-unit anomaly, the torque control part reduces the assist torque so that the assist torque is smaller than an assist torque output before the occurrence of the one-unit anomaly, every time the turning operation proceeds by a set angle.