Circuit architecture for vehicle headlamp switch

摘要

A vehicle switching system includes a controller, a headlamp switch, and a series resistor arrangement. The controller has an input connected to a voltage divider. The switch has a contact movable between positions with each position being associated with a respective headlamp function. The switch is connected to the input of the controller. A top end of each resistor has a connection point associated with a respective switch position. A bottom end of the resistor at the bottom of the series is connected to an electrical ground. Upon the switch contact contacting a connection point a circuit including the resistors between the ground and the connection point is formed such that a signal having a voltage is input to the controller. The voltage of the signal is dependent upon the resistance of the resistors forming the circuit. The controller enables the headlamp function corresponding to the voltage of the signal.