a centralized electrical equipment control system controls the electrical equipment of a vehicle and provides the capability of reducing the manufacturing cost while facilitating the modification and development of the electrical system of the vehicle . the electrical equipment control system has a central control unit including a microcomputer and a communication circuit . the microcomputer exchanges data through the communication circuit via a communication network with respective communication circuits of an ignition i / o unit , a meter i / o unit and a flasher i / o unit to control the i / o units . the electrical equipment control system utilizes only a single microcomputer and a simple i / o port and is thus capable of reducing the manufacturing costs of the electrical equipment .