Abstract: An on-vehicle diagnostic unit for an electronic ignition system monitors input signal received and output signals produced by the electronic ignition control unit on a continuous basis and displays an indiction of proper operation or failure. The failure indication is produced in response to a permanent or intermittent failure, irrespective of the failure mode of the electronic ignition control unit.

Abstract: The present invention is directed to a switching mechanism particularly intended for use in connection with a braking system of a vehicle. The switching mechanism includes a switch supported in a housing and having a movable element which cooperates with an actuating system coupled to the brake pedal. The switch is contained in a housing which is arranged to frictionally engage a brake pedal arm pivot yoke. The switch actuator arm is arranged to be coupled to the brake pedal arm on the vehicle. A friction clutch is provided between the switch actuator arm and the switch actuator to permit a driving but slippable connection between the two whereby the switch actuator arm can pivot to a greater angular extent than the switch actuator. Thus, the switch mechanism of the present invention is self-adjusting despite variations resulting from manufacturing and age variations in the brake pedal assembly.