On-vehicle electronic control unit

摘要

The invention provides an on-vehicle electronic control unit wherein all types of combinations of electrical equipment can be controlled by the electronic control unit with a common arrangement without changing the arrangement of the microcomputer, the print circuit board or the like, which makes it possible to reduce the number of parts of the on-vehicle electronic control unit to a large extent and reduce the cost thereof. The memory portion of a microcomputer of the electronic control unit stores the control programs for all types of electrical equipment to be controlled. Input terminals are opened and/or ground in accordance with the combination of electrical equipment to be controlled so that the microcomputer can recognize the type of the control program to read from the memory portion. In this manner, the electronic control unit is adapted to the change of the combination of the electrical equipment without changing the hardware arrangement. In this case, an alarm for key-forgotten state and a room lamp are both provided normally, and motors for locking and unlocking an electric door lock system are provided optionally so that they can be replaced by other electrical equipment such as electric flexible outer mirrors or other devices.