AUDIO AMPLIFIER

id160000001000


Purpose

•  The audio signal (analog voltage waveform) output from the unit equipped on the vehicle is converted into a digital pulse. The converted digital pulse signal is amplified, converted to an analog signal again, and sent to the speakers.

Function


Road noise correction system (AudioPilot®)

•  The volume of the music constituent obscured by noise is corrected by the audio amplifier based on the cabin noise measured by the AudioPilot® microphone and the vehicle speed signal sent from the CMU.


ALC (auto level control) function (Without Bose®)

•  When the remote tuner (RT) receives the vehicle speed signal sent from the instrument cluster, it automatically changes the volume and audio quality according to the vehicle speed and compensates for the passengers' sense of a lack of audio volume w
hich occurs as a result of external noise while driving.


Electronic sound function

•  The electronic sound supplements the engine sound. A sound for supplementing the motor sound is output from the speakers equipped on the vehicle providing the driver an acceleration feel and a sense of speed.


On-board diagnostic function

•  The audio amplifier has an on-board diagnostic function to facilitate system diagnosis. DTCs are stored in the event of a malfunction occurring. For details, refer to the [DTC TABLE].(See DTC TABLE [CONNECTIVITY MASTER UNIT (E)].)


Construction

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Operation


Audio amplifier operation

1.  The audio amplifier amplifies the audio signal sent (1) from the remote tuner (RT) and CMU, and sends (2) it to the speakers.
2.  The speakers produce (3) audio based on the audio signal sent from the audio amplifier.
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Electronic sound operation

Operation condition
•  The electronic sound operates when all of the following conditions are met.
―  All doors, liftgate are closed
―  CAN information is received normally
1.  When the main power is switched ON (READY off or on), the BCM sends the power switch position status and the specification information of the vehicle to the audio amplifier via CAN communication.
2.  When the audio amplifier receives information about the power switch position status and vehicle specification information, it selects the equalizer built into the audio amplifier and sets (2) the frequency output from the speakers.
3.  The audio amplifier receives (3) the following signals from the PCM and BCM.
PCM
―  Motor status signal
―  Selector lever position
BCM
―  Driver's door latch switch on signal
―  Rear door latch switch on signal
4.  The audio amplifier analyzes the engine load conditions, calculates the range of insufficient motor sound, and produces (4) a electronic sound signal based on the signal received from the PCM and BCM.
5.  The audio amplifier sends (5) the played electronic sound signal to the speaker.
6.  The speakers output (6) the electronic sound based on the supplemental signal received from the audio amplifier.
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