A power supply control system includes: a current sensor as a first detector detecting current flowing in each controller in an operating state of each controller; a first current controller turned on to supply a driving current to each controller in the operating state of each controller and turned off to disconnect the driving current supply to each controller based on a determination result; a second current controller turned on to supply a dark current to each controller in a power-saving state of each controller and turned off to disconnect the dark current supply to each controller in the operation state of each controller; a dark current sensor as a second detector detecting a voltage drop amount in the power-saving state of each controller; and an anomaly determinator determining existence of anomaly in the power-saving state of each controller based on a detection result obtained from the second detector.