Principles of Operation
PRINCIPLES OF OPERATIONThe audio control unit can be powered up when the key is in the ON or ACC position. The audio control unit provides audio signals to the speakers, thus producing sound.
The audio control 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 control unit provides internal circuit protection for shorts to ground, shorts to B+ battery or shorts between any output circuits.
The audio unit receives user input from the integrated control panel (ICP). User-selected information is sent from the ICP to the audio unit through the communication network.
The subwoofer speaker (if equipped) is powered from a separate subwoofer amplifier. The enable/clip circuit carries out 2 functions: to turn on the subwoofer amplifier and to indicate to the audio control unit when the subwoofer output distortion signal reaches a damaging level. The audio control unit then reduces the audio output signal to the subwoofer amplifier.
The enable/clip signal is also sent to the remote compact disc (CD) changer (if equipped). CD audio information is processed by the CD changer and sent to the audio unit, which produces the sound.
The radio suppression equipment reduces interference transmitted through the speakers by the engine ignition and electrical systems.