The audio steering wheel control switches duplicate the function of the primary controls of the associated component, through a network of momentary contact switches and a series of resistors. The radio supplies voltage to the switches and monitors the return signal. Each switch state is associated to a set resistance value and when pressed a specific voltage drops across the resistor unique to that switch. The radio identifies the switch selected and activates the feature. Otherwise, the radio sends a serial data message to the component controlled by the switch and activates the feature.