The audio system consists of the following components
• Audio unit
• Roof antenna (audio)
• Front door speakers
• Front tweeters
• Rear speakers
When the audio system is on, radio signals are received by the window antenna. The audio unit then sends
audio signals to the front door speakers, front tweeters and rear speakers.
Refer to Owner's Manual for audio system operating instructions.

Component Parts Location

INFOID:0000000001499925

AWNIA0134GB

ALNIA0554GB

AV-12

< FUNCTION DIAGNOSIS >

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AUDIO SYSTEM

Component Description

INFOID:0000000001499926

Front tweeter LH M109

Audio unit M42

Front tweeter RH M111

Front door speaker
LH D12
RH D112

Rear door speaker
LH D207
RH D307

Part name

Description

Audio unit

Controls audio system and satellite radio system functions

Front door speakers

• Outputs audio signal from audio unit
• Outputs high, mid and low range sounds

Front tweeters

• Outputs audio signal from audio unit
• Outputs high range sounds

Rear door speakers

• Outputs audio signal from audio unit
• Outputs high, mid and low range sounds

POWER SUPPLY AND GROUND CIRCUIT

AV-13

< COMPONENT DIAGNOSIS >

[BASE AUDIO]

COMPONENT DIAGNOSIS

POWER SUPPLY AND GROUND CIRCUIT

AUDIO UNIT

AUDIO UNIT : Diagnosis Procedure

INFOID:0000000001499928

CHECK FUSES

Check that the following fuses are not blown.

Are the fuses OK?

YES

>> GO TO 2

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

POWER SUPPLY CIRCUIT CHECK

Disconnect audio unit connector M42.

Check voltage between the audio unit connector M42 and
ground.

Are the voltage results as specified?

YES

>> GO TO 3

>> • Check connector housings for disconnected or loose terminals.

• Repair harness or connector.

GROUND CIRCUIT CHECK

Inspect audio unit case ground.

Does case ground pass inspection?

YES

>> Inspection End.

>> Repair audio unit case ground.

Unit

Terminals

Signal name

Fuse No.

Audio unit

Battery power

Ignition switch ACC or ON

Unit

Terminal No.

OFF

ACC

(+)

(-)

Connector

Terminal

Audio unit

M42

Ground

Battery
voltage

Ground

Battery
voltage

WKIA5769E

AV-14

< COMPONENT DIAGNOSIS >

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FRONT DOOR SPEAKER

FRONT DOOR SPEAKER

Description

INFOID:0000000001499930

The audio unit sends audio signals to the front door speakers using the front door speaker circuits.

Diagnosis Procedure

INFOID:0000000001499931

HARNESS CHECK

Disconnect audio unit connector M42 (A) and suspect speaker
connector (B).

Check continuity between audio unit harness connector M42 (A)
terminal and suspect speaker harness connector (B) terminal.

Check continuity between audio unit harness connector M42 (A)
terminal and ground.

Are continuity results as specified?

YES

>> GO TO 2

>> • Check connector housings for disconnected or loose terminals.

• Repair harness or connector.

FRONT SPEAKER SIGNAL CHECK

A B

Continuity

Connector

Terminal

Connector

Terminal

M42

D12

Yes

D112

—

Continuity

Connector

Terminal

M42

Ground

AWNIA0031ZZ

FRONT DOOR SPEAKER

AV-15

< COMPONENT DIAGNOSIS >

[BASE AUDIO]

Connect audio unit connector and front speaker connector.

Turn ignition switch to ACC.

Push “POWER” switch.

Check the signal between audio unit harness connector termi-
nals with CONSULT-III or oscilloscope.

Is the audio signal voltage as specified?

YES

>> Replace speaker. Refer to

AV-34, "Removal and Instal-

lation"

>> Replace audio unit. Refer to

AV-31, "Removal and

Installation"

Connector

Terminal

Condition

Reference

signal

(+)

(-)

M42

Receive audio
signal

AWNIA0032ZZ

SKIA0177E

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