Principles of Operation
PRINCIPLES OF OPERATIONThe audio unit can be powered up when the key is in RUN or ACC. The audio unit provides audio signals to the speakers, thus producing sound.
The audio unit directs the audio signals to the speakers through separate positive and negative circuits for each of the 4 audio channels: LH front, RH front, LH rear, and RH rear. The audio unit provides internal circuit protection for shorts to ground, shorts to voltage, or shorts between any output circuits.
The subwoofer speaker is powered from a separate subwoofer amplifier. The enable circuit turns the subwoofer amplifier on. The audio unit then reduces the audio output signal to the subwoofer amplifier.
The radio suppression equipment reduces interference transmitted through the speakers by the engine ignition and electrical systems.
The steering wheel controls (if equipped) consists of a specific resistor value for each button function creating a voltage divider. When a button is pressed, a specific reference voltage is sent to the audio unit. The audio unit then uses this reference voltage to determine which control input function has been selected.