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

id0903e2818100


Without Bose®

4

No sound from some speakers

Possible DTC

—
Possible cause
•  Speaker muted by audio unit sound adjustment
•  Open or short circuit in wiring harness between audio unit and speaker
•  Speaker malfunction (e.g., any foreign material, broken)
•  Short circuit inside speaker
•  Audio unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Verify the audio unit sound adjustment.
•  Does the fader/balance operate?
Yes
The system is normal. Explain to the customer that the speaker is muted by the audio unit sound setting.
No
Go to the next step.
2
•  Turn the ignition switch to the OFF 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.
3
•  Turn the ignition switch to the OFF position.
•  Remove the audio unit.
•  Disconnect the audio unit connector (24-pin).
•  Inspect the continuity between the audio unit wiring harness-side connector terminal and ground:
For front door speaker
―  Terminal 1A (LH+)—GND
―  Terminal 1C (LH-)—GND
―  Terminal 1D (RH+)—GND
―  Terminal 1F (RH-)—GND
For rear door speaker
―  Terminal 1S (LH+)—GND
―  Terminal 1U (LH-)—GND
―  Terminal 1V (RH+)—GND
―  Terminal 1X (RH-)—GND
•  Disconnect the front door speaker connector (4-pin)
•  Inspect the continuity between the front door speaker wiring harness-side connector terminal and ground:
For tweeter
―  Terminal 1A (LH+)—GND
―  Terminal 1C (LH-)—GND
―  Terminal 1D (RH+)—GND
―  Terminal 1F (RH-)—GND
•  Is there continuity?
Yes
Repair or replace the suspect wiring harness or speaker unit.
No
Go to the next step.
Note
•  If there is a short circuit between the speaker harness or speaker lead wire and ground, the protector circuit inside the audio unit operates to cut the sound.
4
•  Turn the ignition switch to the OFF position.
•  Remove the audio unit.
•  Disconnect the audio unit connector (24-pin).
•  Inspect the continuity between the audio unit wiring harness-side connector terminal and ground:
For front door speaker/tweeter
―  Terminal 1A (LH+)—GND
―  Terminal 1C (LH-)—GND
―  Terminal 1D (RH+)—GND
―  Terminal 1F (RH-)—GND
•  Is there continuity?
Yes
Go to the next step.
No
Go to Step 9.
5
•  Remove the front door speaker.
•  Disconnect the front door speaker connector.
•  Inspect the continuity between the audio unit wiring harness-side connector terminal and ground:
For front door speaker/tweeter
―  Terminal 1A (LH+)—GND
―  Terminal 1C (LH-)—GND
―  Terminal 1D (RH+)—GND
―  Terminal 1F (RH-)—GND
•  Is there continuity?
Yes
Go to the next step.
No
Replace the front door speaker (LH or RH) because there is a short to ground in the front door speaker (LH or RH).
(See FRONT DOOR SPEAKER REMOVAL/INSTALLATION.)
6
•  Remove the tweeter.
•  Disconnect the tweeter connector.
•  Inspect the continuity between the audio unit wiring harness-side connector terminal and ground:
For front door speaker/tweeter
―  Terminal 1A (LH+)—GND
―  Terminal 1C (LH-)—GND
―  Terminal 1D (RH+)—GND
―  Terminal 1F (RH-)—GND
•  Is there continuity?
Yes
If there is a common connector:If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between audio unit and front door speaker/tweeter.
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
•  Repair or replace the wiring harness which has a short to ground.
Note
•  If there is a short circuit between the speaker harness or speaker lead wire and ground, the protector circuit inside the audio unit operates to cut the sound.
No
Replace the tweeter (LH or RH) because there is a short to ground in the tweeter (LH or RH).
(See TWEETER REMOVAL/INSTALLATION.)
7
•  Inspect the continuity between the audio unit wiring harness-side connector terminal and ground:
For rear door speaker
―  Terminal 1S (LH+)—GND
―  Terminal 1U (LH-)—GND
―  Terminal 1V (RH+)—GND
―  Terminal 1X (RH-)—GND
•  Is there continuity?
Yes
Go to the next step.
No
Replace the audio unit.
(See AUDIO UNIT REMOVAL/INSTALLATION.)
8
•  Remove the rear door speaker.
•  Disconnect the rear door speaker connector.
•  Inspect the continuity between the audio unit wiring harness-side connector terminal and ground:
For rear door speaker
―  Terminal 1S (LH+)—GND
―  Terminal 1U (LH-)—GND
―  Terminal 1V (RH+)—GND
―  Terminal 1X (RH-)—GND
•  Is there continuity?
Yes
If there is a common connector:If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between audio unit and rear door speaker.
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
•  Repair or replace the wiring harness which has a short to ground.
Note
•  If there is a short circuit between the speaker harness or speaker lead wire and ground, the protector circuit inside the audio unit operates to cut the sound.
No
Replace the rear door speaker (LH or RH) because there is a short to ground in the rear door speaker (LH or RH).
(See REAR DOOR SPEAKER REMOVAL/INSTALLATION.)
9
•  Disconnect the speaker connector (4-pin), tweeter connector (2-pin) and inspect the resistance of speaker.
•  Inspect the continuity between the audio unit wiring harness-side connector terminal and speaker wiring harness-side connector:
Audio unit—front door speaker
―  Terminal 1A (LH+)—terminal B
―  Terminal 1C (LH-)—terminal A
―  Terminal 1D (RH+)—terminal B
―  Terminal 1F (RH-)—terminal A
Audio unit—rear door speaker
―  Terminal 1S (LH+)—terminal B
―  Terminal 1U (LH-)— terminal A
―  Terminal 1V (RH+)—terminal B
―  Terminal 1X (RH-)—terminal A
Audio unit—tweeter
―  Terminal 1A (LH+)—terminal B
―  Terminal 1C (LH-)—terminal A
―  Terminal 1D (RH+)—terminal B
―  Terminal 1F (RH-)—terminal A
•  Is there continuity?
Yes
Go to the next step.
No
If there is a common connector:If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between audio unit and speaker.
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
•  Repair or replace the wiring harness which has an open circuit.
10
•  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.)
No
Replace the speaker.
(See FRONT DOOR SPEAKER REMOVAL/INSTALLATION.)
(See REAR DOOR SPEAKER REMOVAL/INSTALLATION.)
(See TWEETER REMOVAL/INSTALLATION.)


With Bose®

4

No sound from some speakers

Possible DTC

—
Possible cause
•  Speaker muted by audio unit sound adjustment
•  Poor connection of audio unit connector, terminal damage
•  Poor connection of audio amplifier connector
•  Open or short circuit in wiring harness between audio amplifier and audio unit
•  Open or short circuit in wiring harness between audio amplifier and speaker
•  Audio unit malfunction
•  Short circuit inside speaker
•  Speaker malfunction (e.g., foreign material, broken)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Verify the audio unit sound adjustment.
•  Does the fader/balance operate?
Yes
The system is normal. Explain to the customer that the speaker is muted by the audio unit sound setting.
No
Go to the next step.
2
•  Does the same speaker have no sound if changing the sound source? (Radio, CD)
Yes
Go to the next step.
No
Replace the audio unit.
(See AUDIO UNIT REMOVAL/INSTALLATION.)
Note
•  If the different speaker has no sound now, the audio unit is malfunctioning.
3
•  Turn the ignition switch to the OFF 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 OFF 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 1A (LH+)—GND
―  Terminal 1C (LH-)—GND
―  Terminal 1D (RH+)—GND
―  Terminal 1F (RH-)—GND
―  Terminal 1S (LH+)—GND
―  Terminal 1U (LH-)—GND
―  Terminal 1V (RH+)—GND
―  Terminal 1X (RH-)—GND
•  Is there continuity?
Yes
If there is a common connector:If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between audio unit and audio amplifler.
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
•  Repair or replace the wiring harness which has a short to ground.
Note
•  If there is a short to ground in wiring harness between the audio unit and audio amplifier, the protector circuit inside the audio unit operates to cut the sound.
No
Go to the next step.
5
•  Inspect the continuity between the following terminals of the audio amplifier wiring harness-side connector (16-pin) and the audio unit wiring harness-side connector (24-pin).
―  Terminal 1A (LH+)—Terminal 2L
―  Terminal 1C (LH-)—Terminal 2J
―  Terminal 1D (RH+)—Terminal 2K
―  Terminal 1F (RH-)—Terminal 2I
―  Terminal 1S (LH+)— Terminal 5L
―  Terminal 1U (LH-)— Terminal 5J
―  Terminal 1V (RH+)— Terminal 5K
―  Terminal 1X (RH-)— Terminal 5I
•  Is there continuity?
Yes
Go to the next step.
No
If there is a common connector:If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between audio unit and audio amplifier.
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
•  Repair or replace the wiring harness which has an open circuit.
Then go to the next step.
Note
•  If there is a open in wiring harness between the audio unit and audio amplifier, the protector circuit inside the audio unit operates to cut the sound.
6
•  Inspect the connection of the audio amplifier connector.
•  Is the connector connected securely?
Yes
Go to the next step.
No
Connect the audio amplifier securely.
7
•  Turn the ignition switch to the OFF position.
•  Disconnect the audio amplifier connector.
•  Inspect continuity between the following terminals of the audio amplifier connector and speaker connector.
For front door speaker
―  Terminal 3L (LH+)—Terminal B
―  Terminal 3N (LH-)—Terminal A
―  Terminal 3K (RH+)—Terminal B
―  Terminal 3M (RH-)—Terminal A
For front speaker
―  Terminal 3B (LH+)—Terminal B
―  Terminal 3A (LH-)—Terminal A
―  Terminal 3D (RH+)—Terminal B
―  Terminal 3F (RH-)—Terminal A
For rear door speaker
―  Terminal 3I (LH+)—Terminal B
―  Terminal 3G (LH-)—Terminal A
―  Terminal 3C (RH+)—Terminal B
―  Terminal 3E (RH-)—Terminal A
For rear speaker
―  Terminal 4G—Terminal B
―  Terminal 4E—Terminal A
―  Terminal 4D—Terminal B
―  Terminal 4C—Terminal A
For center speaker
―  Terminal 3H—Terminal B
―  Terminal 3J—Terminal A
•  Is there continuity?
Yes
Go to the next step.
No
If there is a common connector:If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between audio amplifier connector and speaker connector.
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
•  Repair or replace the wiring harness which has an open circuit.
8
•  Turn the ignition switch to the OFF position.
•  Disconnect the audio amplifier connector.
•  Inspect the continuity between the audio amplifier connector and ground:
For front door speaker
―  Terminal 3L (LH+)—GND
―  Terminal 3N (LH-)—GND
―  Terminal 3K (RH+)—GND
―  Terminal 3M (RH-)—GND
For front speaker
―  Terminal 3B (LH+)—GND
―  Terminal 3A (LH-)—GND
―  Terminal 3D (RH+)—GND
―  Terminal 3F (RH-)—GND
For rear door speaker
―  Terminal 3I (LH+)—GND
―  Terminal 3G (LH-)—GND
―  Terminal 3C (RH+)—GND
―  Terminal 3E (RH-)—GND
For rear speaker
―  Terminal 4G—GND
―  Terminal 4E—GND
―  Terminal 4D—GND
―  Terminal 4C—GND
For center speaker
―  Terminal 3H—GND
―  Terminal 3J—GND
•  Is there continuity?
Yes
Go to the next step.
No
Go to Step 10.
9
•  Disconnect each speaker connector.
•  Inspect the continuity between the audio amplifier connector and ground:
For front door speaker
―  Terminal 3L (LH+)—GND
―  Terminal 3N (LH-)—GND
―  Terminal 3K (RH+)—GND
―  Terminal 3M (RH-)—GND
For front speaker
―  Terminal 3B (LH+)—GND
―  Terminal 3A (LH-)—GND
―  Terminal 3D (RH+)—GND
―  Terminal 3F (RH-)—GND
For rear door speaker
―  Terminal 3I (LH+)—GND
―  Terminal 3G (LH-)—GND
―  Terminal 3C (RH+)—GND
―  Terminal 3E (RH-)—GND
For rear speaker
―  Terminal 4G—GND
―  Terminal 4E—GND
―  Terminal 4D—GND
―  Terminal 4C—GND
For center speaker
―  Terminal 3H—GND
―  Terminal 3J—GND
•  Is there continuity?
Yes
If there is a common connector:If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between audio amplifier connector and speaker connector.
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
•  Repair or replace the wiring harness which has a short to ground.
Note
•  If there is a short circuit between the speaker harness or speaker lead wire and ground, the protector circuit inside the audio unit operates to cut the sound.
No
Replace the speaker because a short to ground in the speaker connected to the circuit without continuity can be considered the cause.
(See FRONT DOOR SPEAKER REMOVAL/INSTALLATION.)
(See FRONT SPEAKER REMOVAL/INSTALLATION.)
(See REAR DOOR SPEAKER REMOVAL/INSTALLATION.)
(See REAR SPEAKER REMOVAL/INSTALLATION.)
(See CENTER SPEAKER REMOVAL/INSTALLATION.)
10
•  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.)
No
Replace the speaker.
(See FRONT DOOR SPEAKER REMOVAL/INSTALLATION.)
(See FRONT SPEAKER REMOVAL/INSTALLATION.)
(See REAR DOOR SPEAKER REMOVAL/INSTALLATION.)
(See REAR SPEAKER REMOVAL/INSTALLATION.)
(See CENTER SPEAKER REMOVAL/INSTALLATION.)