Electronic range indicator for motor vehicle - has switch array powered by vehicle ignition voltage used to indicate selected transmission range

摘要

The electronic range indicator apparatus has a switch array powered by the vehicle ignition voltage used to indicate the selected transmission range during both on off periods of the vehicle. During on periods of the vehicle, the ignition voltage is transmitted through the closed contacts (if any) of the switch array, and an electronic control module decodes the output of the switch array and lights the indicator indicia corresponding to the selected ranqe. During off periods of the vehicle, the ignition feed to the switch array is open circuited. In such case, the control module intermittently reverses the potential across the switch array, and lights the appropriate indicator indicia using a reverse logic decode scheme.