Steering Mounted Controls Transmitter: Description and Operation

STEERING WHEEL CONTROLS

Some audio functions are available using the steering wheel controls. The steering wheel controls are actually a resistor network which consists of multiple momentary contact switches and a series of resistors. The switches and resistor network is arranged so that each switch has a different resistance value. When a switch is pressed, a voltage drop occurs in the resistor network which produces a specific voltage value unique to the switch selected. These specific voltage values allow the radio to identify which switch has been pressed. The radio responds just as if the corresponding radio front panel button had been pressed.

The RADIO fuse in the Fuse Block-I/P provides accessory voltage to the steering wheel controls. The specific voltage signal from the switches is sent to the radio via the steering wheel controls signal circuit.