Patent ID: 6226574
Filing Date: 2001-05-01
Classification: G01R

Abstract:
A method for testing an on-vehicle electronic unit comprising: a plurality of input circuits connected to a plurality of external switches, into which operation signals of the respective external switches are entered; a plurality of output circuits for outputting predetermined output signals to an external unit; and a control unit for controlling said respective output signals derived from said plural output circuits in response to said respective operation signals entered via said plural input circuits, in which a test apparatus is connected to said on-vehicle electronic unit so as to test the electronic unit mounted on an automobile,said test apparatus having a function for performing switching operation of the respective switches; a function for entering a preselected command instruction to a junction point while said test apparatus is connected to said junction point between the respective input circuits of said electronic unit and the respective switches; a function for receiving said respective output signals from said respective output circuits while said test apparatus is connected to said respective output circuits of said electronic unit; and a function for judging as to whether or not the respective output signals derived from the respective output circuit are adapted to either said switch operation of the respective switches or the command instruction entered into the junction point between said respective input circuit and said respective switches; said testing method comprising the steps of:a first input test step for executing the switch operation of said respective switches;a second input test step for entering a command instruction to the junction point between the respective input circuits of the electronic unit and the respective switches, said command instruction instructing that information about condition of the switching operation of said switches with respect to the respective input circuits is returned;a third input test step for receiving the condition information of the switching operation of said switches outputted from said output circuit in response to the command instruction entered at said second input test step; anda fourth input test step for judging as to whether or not the condition information of the switching operation of said switches received at said third input test step is adapted to the switching operations of said respective switches at the first input test step.