Method for testing on-vehicle electronic unit

摘要

A method for testing an on-vehicle electronic unit in that while presently available input circuits 11 to 16 and also output circuits 18 to 22 are directly utilized without newly setting an exclusively used interface circuit on the side of an electronic unit 3, a command instruction is applied to these input circuits and output circuits by way of a multiplex serial communication by turning ON/OFF switches 2a to 2f so as to test as to whether or not the switches 2a to 2f are confirmed under normal states by the respective input circuits 11 to 16. Also, a similar operation signal to the switching operation of the switches 2a to 2f is supplied by way of the command instruction by the multiplex serial communication in order to check as to whether or not the output signals derived from the respective output circuits 18 to 22 are proper.