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

Current control function at engine restart by i-stop (With i-stop system)
•  When the audio amplifier receives a voltage increase request signal from the PCM, output current to the speakers is controlled at 10 A or less to assure input voltage to the DC-DC converter when the engine is re-started by the i-stop control. (With i-stop system)
Active engine sound function (With i-stop system, without i-ELOOP)
•  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.

Construction

•  The audio amplifier is placed in the front side trim (RH).
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Terminal Layout and Signal

L.H.D.

Terminal

Signal
1A
—
1B
—
1C
—
1D
—
1E
—
1F
—
1G
Microphone (+)
1H
Microphone (-)
1I
Rear door speaker input RH (+)
1J
Rear door speaker input RH (-)
1K
Rear door speaker input LH (+)
1L
Rear door speaker input LH (-)
1M
Front door speaker input RH (+)
1N
Front door speaker input RH (-)
1O
Front door speaker input LH (+)
1P
Front door speaker input LH (-)
2A
Rear door speaker output LH (+)
2B
Rear door speaker output LH (-)
2C
Tweeter/Front side speaker output LH (-)
2D
ACC
2E
Tweeter/Front side speaker output LH (+)
2F
PWM control (ACU communication)
2G
Front center speaker output (+)
2H
AudioPilot ®2
2I
Front center speaker output (-)
2J
i-stop control*
2K
Tweeter/Front side speaker output RH (-)
2L
CAN_H
2M
Tweeter/Front side speaker output RH (+)
2N
CAN_L
2O
Rear speaker output (+)
2P
Rear speaker output (-)
3A
B+
3B
Ground
3C
Front door speaker output LH (+)
3D
Front door speaker output LH (-)
3E
Front door speaker output RH (+)
3F
Front door speaker output RH (-)
3G
Rear door speaker output LH (-)
3H
Rear door speaker output LH (+)

*  :With i-stop system, without i-ELOOP system

R.H.D.

Terminal

Signal
1A
—
1B
—
1C
—
1D
—
1E
—
1F
—
1G
Microphone (+)
1H
Microphone (-)
1I
Rear door speaker input LH (+)
1J
Rear door speaker input LH (-)
1K
Rear door speaker input RH (+)
1L
Rear door speaker input RH (-)
1M
Front door speaker input LH (+)
1N
Front door speaker input LH (-)
1O
Front door speaker input RH (+)
1P
Front door speaker input RH (-)
2A
Rear door speaker output LH (+)
2B
Rear door speaker output LH (-)
2C
Tweeter/front side speaker output LH (-)
2D
ACC
2E
Tweeter/front side speaker output LH (+)
2F
PWM control (ACU communication)
2G
Front center speaker output (+)
2H
AudioPilot ®2
2I
Front center speaker output (-)
2J
i-stop control*
2K
Tweeter/front side speaker output LH (-)
2L
CAN_H
2M
Tweeter/front side speaker output LH (+)
2N
CAN_L
2O
Rear speaker output (+)
2P
Rear speaker output (-)
3A
B+
3B
GND
3C
Front door speaker output RH (+)
3D
Front door speaker output RH (-)
3E
Front door speaker output LH (+)
3F
Front door speaker output LH (-)
3G
Rear door speaker output RH (-)
3H
Rear door speaker output RH (+)


Operation

Note
•  For the audio amplifier operation, refer to the AUDIO SYSTEM.

Engine restart by i-stop (With i-stop system)

1.  The PCM sends a boost request signal to the DC-DC converter and audio amplifier when the engine is restarted by the i-stop control.

2.  When the DC-DC converter receives a boost request signal from the PCM, the power supply voltage is increased to the audio unit.

3.  When the audio amplifier receives a boost request signal, output current to the speaker is controlled to 10 A or less.

Note
•  If the audio amplifier performs current control when the audio volume is 50 or more, the audio volume may decrease for approx. 0.3 s.

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Active engine sound function (With i-stop system, without i-ELOOP)

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

•  Function not equipped.