AUDIO AMPLIFIER

id092000011200


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 instrument cluster.


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 [ON-BOARD DIAGNOSTIC SYSTEM]. (See ON-BOARD DIAGNOSTIC [AUDIO AMPLIFIER].)


Active engine sound function

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


Structure/Construction

•  The audio amplifier is positioned under the front seat (RH).
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Terminal Layout and Signal

L.H.D.

Terminal

Signal
1A
Bass-box output (+)
1B
Bass-box output (-)
1C
—
1D
—
1E
—
1F
—
1G
AudioPilot® (+)
1H
AudioPilot® (-)
1I
Rear speaker RH side input(+)
1J
Rear speaker RH side input (-)
1K
Rear speaker LH side input (+)
1L
Rear speaker LH side input (-)
1M
Front speaker RH side input (+)
1N
Front speaker RH side input (-)
1O
Front speaker LH side input (+)
1P
Front speaker LH side input (-)
2A
Rear door speaker output RH (+)
2B
Rear door speaker output RH (-)
2C
Front side speaker output LH (-)
2D
Audio amplifier control
2E
Front side speaker output LH (+)
2F
Audio amplifier signal
2G
Front center speaker output (+)
2H
Pulse width modulation (PWM) control
2I
Front center speaker output (-)
2J
—
2K
Front side speaker output RH (-)
2L
CAN_H
2M
Front side speaker output RH (+)
2N
CAN_L
2O
Rear speaker LH/RH (+)
2P
Rear speaker LH/RH (-)
3A
B+
3B
Ground
3C
Front door speaker output LH (+) / tweeter output LH (+)
3D
Front door speaker output LH (-) / tweeter output LH (-)
3E
Front door speaker output RH (+) / tweeter output RH (+)
3F
Front door speaker output RH (-) / tweeter output RH (-)
3G
Rear door speaker output LH (-)
3H
Rear door speaker output LH (+)

R.H.D.

Terminal

Signal
1A
Bass-box output (+)
1B
Bass-box output (-)
1C
—
1D
—
1E
—
1F
—
1G
AudioPilot® (+)
1H
AudioPilot® (-)
1I
Rear speaker LH side input(+)
1J
Rear speaker LH side input (-)
1K
Rear speaker RH side input (+)
1L
Rear speaker RH side input (-)
1M
Front speaker LH side input (+)
1N
Front speaker LH side input (-)
1O
Front speaker RH side input (+)
1P
Front speaker RH side input (-)
2A
Rear door speaker output LH (+)
2B
Rear door speaker output LH (-)
2C
Front side speaker output RH (-)
2D
Audio amplifier control
2E
Front side speaker output RH (+)
2F
Audio amplifier signal
2G
Front center speaker output (+)
2H
Pulse width modulation (PWM) control
2I
Front center speaker output (-)
2J
—
2K
Front side speaker output LH (-)
2L
CAN_H
2M
Front side speaker output LH (+)
2N
CAN_L
2O
Rear speaker LH/RH (+)
2P
Rear speaker LH/RH (-)
3A
B+
3B
Ground
3C
Front door speaker output RH (+) / tweeter output RH (+)
3D
Front door speaker output RH (-) / tweeter output RH (-)
3E
Front door speaker output LH (+) / tweeter output LH (+)
3F
Front door speaker output LH (-) / tweeter output LH (-)
3G
Rear door speaker output RH (-)
3H
Rear door speaker output RH (+)


Operation

1.  The audio amplifier amplifies the audio signal sent (1) from the tuner and amp unit (TAU) and sends (2) it to the speakers.
2.  The speakers produce (3) audio based on the audio signal sent from the TAU.
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Active engine sound function

Note
•  When all of the following conditions are met, the active engine sound function operates.
―  Active engine sound function is ON (disconnecting M-MDS)
―  All doors, liftgate, and trunk lid are closed
―  Configuration is completed
―  CAN information received normally

1.  When the ignition is switched ON (engine off or on), the PCM sends the engine information and the ignition condition, and the instrument cluster sends vehicle specification information to the audio amplifier via a CAN signal.

2.  When the engine information and the specification information for the ignition condition and vehicle are received, the audio amplifier selects the equalizer built into the audio amplifier and sets the frequency output from the speaker.

3.  The PCM sends the engine condition signal and acceleration pedal angle, the TCM sends the shift range position, and the instrument cluster sends a driver-side door latch switch on signal and rear door latch switch on signal to the audio amplifier via a CAN signal.

4.  The audio amplifier analyzes the engine load conditions, calculates the range of insufficient engine sound, and produces a supplemental signal based on the signal received from the PCM, TCM and instrument cluster.

5.  The audio amplifier sends the produced supplemental signal to the front door speaker and the front side speaker.

6.  The front door speaker and the front side speaker output a sound for supplementing the engine sound based on the produced supplemental signal sent from the audio amplifier.

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Fail-safe

•  Not applicable