NO.4 NO SOUND FROM SOME SPEAKERS [ENTIRE AUDIO SYSTEM]

id0903e2818100


Vehicles Without Bose®

4

No sound from some speakers/ Possible DTC: —
Troubleshooting hints
•  Speaker malfunction (e.g., foreign material penetration, broken)
•  Audio unit malfunction
•  Short circuit inside speaker
•  Open or short circuit in wiring harness between audio unit and speaker
•  Poor connection of audio unit connector, terminal damage

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Turn the audio unit on.
•  Press the POWER and simultaneously press the AUTO-M button for approx. 1 s.
Note
•  The speaker outputting sound changes in the order of left- front door speaker, right - front door speaker, left - rear door speaker and right - rear door speaker.
•  Is there any speaker that does not output sound?
Yes
If no sound from some speaker:
•  Go to the next step.
If no sound at all:
•  Go to the troubleshooting of “No.3 No sound from all speakers”.
No
The troubleshooting is completed.
2
•  Turn the ignition switch to the LOCK position.
•  Disconnect the audio unit connector (24-pin).
•  Inspect the continuity between the audio unit wiring harness-side connector (24-pin) terminal and ground.
•  Is there continuity?
Yes
Repair or replace the suspect wiring harness or the speaker unit.
Note
•  If there is a short circuit between the speaker wiring harness or the speaker lead wire and ground, the protector circuit inside the audio unit operates to cut the sound.
No
Go to the next step.
3
•  Remove the suspect speaker.
•  Disconnect the speaker connector (2-pin) and inspect the resistance of the speaker.
•  Is the resistance normal?
Specification
Speaker resistance + wiring harness resistance
Yes
Replace the audio unit.
(See AUDIO UNIT REMOVAL/INSTALLATION.)
(See AUDIO UNIT DISASSEMBLY/ASSEMBLY.)
No
Go to the next step.
4
•  Inspect the wiring harness between the audio unit and the suspect speaker.
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the suspect wiring harness.
5
•  Inspect the suspect speaker.
•  Is the speaker normal?
Note
•  If the speaker lead wire contacts to either ground or vehicle frame, replace the speaker.
Yes
Replace the audio unit.
(See AUDIO UNIT REMOVAL/INSTALLATION.)
(See AUDIO UNIT DISASSEMBLY/ASSEMBLY.)
No
Replace the speaker.
(See FRONT DOOR SPEAKER REMOVAL/INSTALLATION.)
(See REAR DOOR SPEAKER REMOVAL/INSTALLATION.)
(See FRONT SPEAKER REMOVAL/INSTALLATION.)


Vehicles With Bose®

4

No sound from certain speaker/ Possible DTC: —
Troubleshooting hints
•  Speaker malfunction (e.g., foreign material penetration, damage)
•  Audio amplifier malfunction
•  Audio unit malfunction
•  Short circuit inside speaker
•  Open or short circuit in wiring harness between audio amplifier and speaker
•  Open or short circuit in wiring harness between audio amplifier and audio unit
•  Poor connection of audio unit connector, terminal damage
•  Poor connection of audio amplifier connector

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Turn the audio unit on.
•  Press the POWER button and simultaneously press the AUTO-M button for approx. 1 s.
Note
•  This function outputs sound to each speaker sequentially to allow determination of which speaker is not emitting sound.
•  Is there any speaker that does not output sound?
Yes
If no sound from some speakers:
•  Go to the next step.
If not sound at all:
•  Go to the troubleshooting of “No.3 No sound from all speakers”.
No
The troubleshooting completed. (The system is normal.)
2
•  Does the same speaker output no sound if the audio source is changed? (Radio, CD)
Yes
Go to the next step.
No
Replace the audio unit.
(See AUDIO UNIT REMOVAL/INSTALLATION.)
(See AUDIO UNIT DISASSEMBLY/ASSEMBLY.)
Note
•  If a different speaker outputs no sound, the audio unit is malfunctioning.
3
•  Turn the ignition switch to the LOCK position.
•  Inspect the connection of the audio unit connector (24-pin). (for sound signal line)
•  Is the connector connected securely?
Yes
Go to the next step.
No
Connect the audio unit connector (24-pin) securely.
4
•  Turn the ignition switch to the LOCK position.
•  Remove the audio unit.
•  Disconnect the audio unit connector (24-pin).
•  Inspect the continuity between the audio unit wiring harness-side connector and ground.
―  Terminal A (LH+)—GND
―  Terminal C (LH-)—GND
―  Terminal D (RH+)—GND
―  Terminal F (RH-)—GND
•  Is there continuity?
Yes
Repair or replace short to ground between audio unit and audio amplifier.
Then go to the next step.
No
Go to the next step.
5
•  Inspect for continuity between following terminals:
For front speaker
―  Audio unit terminal 1A (LH+)—audio amplifier terminal 2L
―  Audio unit terminal 1C (LH-)—audio amplifier terminal 2J
―  Audio unit terminal 1D (RH+)—audio amplifier terminal 2K
―  Audio unit terminal 1F (RH-)—audio amplifier terminal 2I
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the related wiring harness between the audio amplifier and the audio unit.
Then go to the next step.
6
•  Inspect the connection of the audio amplifier connector (40-pin).
•  Is the connector connected securely?
Yes
Go to the next step.
No
Connect the audio amplifier (40-pin) securely.
7
•  Turn the ignition switch to the LOCK position.
•  Disconnect the audio amplifier connector (40-pin).
•  Inspect for continuity between following terminals: Inspect the continuity between the following terminals of the audio amplifier connector and speaker connector.
For front speaker (LH)
―  Audio amplifier terminal 3A—front speaker (LH) terminal A
―  Audio amplifier terminal 3B—front speaker (LH) terminal B
For front speaker (RH)
―  Audio amplifier terminal 3F—front speaker (RH) terminal A
―  Audio amplifier terminal 3D—front speaker (RH) terminal B
For front door speaker (LH)
―  Audio amplifier terminal 3N—front door speaker (LH) terminal A
―  Audio amplifier terminal 3L—front door speaker (LH) terminal B
For front door speaker (RH)
―  Audio amplifier terminal 3M—front door speaker (RH) terminal A
―  Audio amplifier terminal 3K—front door speaker (RH) terminal B
For rear door speaker (LH)
―  Audio amplifier terminal 3G—front door speaker (LH) terminal A
―  Audio amplifier terminal 3I—front door speaker (LH) terminal B
For rear door speaker (RH)
―  Audio amplifier terminal 3E—rear door speaker (RH) terminal A
―  Audio amplifier terminal 3C—rear door speaker (RH) terminal B
For rear speaker (LH)
―  Audio amplifier terminal 4E—rear speaker (LH) terminal A
―  Audio amplifier terminal 4G—rear speaker (LH) terminal B
For rear speaker (RH)
―  Audio amplifier terminal 4C—rear speaker (RH) terminal A
―  Audio amplifier terminal 4D—rear speaker (RH) terminal B
For center speaker
―  Audio amplifier terminal 3J—center speaker terminal A
―  Audio amplifier terminal 3H—center speaker terminal B
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the related wiring harnesses.
8
•  Turn the ignition switch to the LOCK position.
•  Disconnect the audio amplifier connector (40-pin).
•  Inspect for continuity between following terminals:
For front speaker
―  Audio amplifier terminal 3A—GND
―  Audio amplifier terminal 3B—GND
―  Audio amplifier terminal 3F—GND
―  Audio amplifier terminal 3D—GND
For front door speaker
―  Audio amplifier terminal 3N—GND
―  Audio amplifier terminal 3L—GND
―  Audio amplifier terminal 3M— GND
―  Audio amplifier terminal 3K— GND
For rear door speaker
―  Audio amplifier terminal 3G—GND
―  Audio amplifier terminal 3I—GND
―  Audio amplifier terminal 3E—GND
―  Audio amplifier terminal 3C—GND
For rear speaker
―  Audio amplifier terminal 4E—GND
―  Audio amplifier terminal 4G—GND
―  Audio amplifier terminal 4C—GND
―  Audio amplifier terminal 4D—GND
For center speaker
―  Audio amplifier terminal 3J—GND
―  Audio amplifier terminal 3H—GND
•  Is there continuity?
Yes
Repair or replace the related wiring harness or the speaker unit.
(See FRONT DOOR SPEAKER REMOVAL/INSTALLATION.)
(See REAR SPEAKER REMOVAL/INSTALLATION.)
(See CENTER SPEAKER REMOVAL/INSTALLATION.)
(See FRONT SPEAKER REMOVAL/INSTALLATION.)
(See REAR SPEAKER REMOVAL/INSTALLATION.)
Note
•  If there is a short circuit between the speaker wiring harness or the speaker lead wire and ground, the protector circuit inside the audio unit operates to cut the sound.
No
Go to the next step.
9
•  Remove the suspect speaker.
•  Disconnect the speaker connector (2-pin) and inspect the resistance of the speaker.
•  Is the speaker resistance within the specified?
Specification:
Speaker resistance + wiring resistance
Note
•  If the speaker lead wire contacts to either ground or vehicle frame, replace the speaker.
Yes
Replace the audio amplifier.
(See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)
No
Replace the speaker.
(See FRONT DOOR SPEAKER REMOVAL/INSTALLATION.)
(See REAR SPEAKER REMOVAL/INSTALLATION.)
(See CENTER SPEAKER REMOVAL/INSTALLATION.)
(See FRONT SPEAKER REMOVAL/INSTALLATION.)
(See REAR SPEAKER REMOVAL/INSTALLATION.)