•  Supplies power to each part by switching the main relay on/off at the optimal timing according to the vehicle conditions.

•  When the ignition is switched ON (engine off or on), the main relay turns on and electrical power is supplied to each sensor and device.

•  When the ignition is switched off from ON (engine off or on), an on-request signal is received from each control (such as drive-by-wire control, electric variable valve timing control) and the main relay turns on for a specified period.