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

id0903e2818100

Vehicles Without Bose^®

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

Diagnostic procedure

STEP	INSPECTION		ACTION
1	• Turn the ignition switch to the ACC or ON position. • Turn the audio unit power to ON. • While pressing the POWER/VOLUME switch, simultaneously press the AUTO-M switch for 0.2 s or more. • 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”.
1		No	The troubleshooting is completed.
2	• Does the same speaker output no sound if the audio source is changed? (Radio, CD)	Yes	Go to the next step.
2		No	Replace the audio unit. (See CENTER PANEL UNIT REMOVAL/INSTALLATION.) (See CENTER PANEL 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.
3		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. For door speakers ― Terminal 1A (LH+) — GND ― Terminal 1C (LH-) — GND ― Terminal 1D (RH+) — GND ― Terminal 1F (RH-) — GND For rear speakers ― Terminal 1X (LH+) — GND ― Terminal 1V (LH-) — GND ― Terminal 1U (RH+) — GND ― Terminal 1S (RH-) — GND • Is there continuity?	Yes	Repair or replace the related wiring harnesses or speaker.
4		No	Go to the next step. Note • If there is a short circuit between the speaker wiring harnesses or the speaker lead wire and ground, the protector circuit inside the audio unit operates to cut the sound.
5	• Disconnect the speaker 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 speaker ― Terminal 1A (LH+)—terminal B ― Terminal 1C (LH-)—terminal A ― Terminal 1D (RH+)—terminal B ― Terminal 1F (RH-)—terminal A Audio unit—rear speaker ― Terminal 1X (LH+)—terminal B ― Terminal 1V (LH-)—terminal A ― Terminal 1U (RH+)—terminal B ― Terminal 1S (RH-)—terminal A • Is there continuity?	Yes	Go to the next step.
5		No	Repair or replace the suspect wiring harness or speaker.
6	• Inspect the suspect speaker. • Is the speaker normal? Note • If the speaker lead wire contacts either the ground or vehicle frame, replace the speaker.	Yes	Replace the audio unit. (See CENTER PANEL UNIT REMOVAL/INSTALLATION.) (See CENTER PANEL UNIT DISASSEMBLY/ASSEMBLY.)
6		No	Replace the speaker.

Vehicles With Bose^®

4	No sound from some speakers
POSSIBLE CAUSE	• Short circuit inside speaker • Audio unit malfunction • 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 speaker • Open or short circuit in wiring harness between audio amplifier and audio unit • Audio amplifier malfunction • Speaker malfunction (e.g., foreign material penetration, damage)

No sound from some speakers

Possible DTC

—

POSSIBLE CAUSE

• Short circuit inside speaker

• Audio unit malfunction

• 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 speaker

• Open or short circuit in wiring harness between audio amplifier and audio unit

• Audio amplifier malfunction

• Speaker malfunction (e.g., foreign material penetration, damage)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	• Turn the ignition switch to the ACC or ON position. • Turn the audio unit power to ON. • While pressing the POWER/VOLUME switch, simultaneously press the AUTO-M switch for 0.2 s or more. • Is there any speaker that does not output sound?	Yes	If there is no sound from some speakers: • Go to the next step. If there is no sound at all: • Go to troubleshooting “No.3 No sound from all speakers”.
1		No	The troubleshooting is completed.
2	• Does the same speaker output no sound if the audio source is changed? (Radio, CD)	Yes	Go to the next step.
2		No	Replace the audio unit. (See CENTER PANEL UNIT REMOVAL/INSTALLATION.) (See CENTER PANEL 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.
3		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. For door speakers ― Terminal 1A (LH+) — GND ― Terminal 1C (LH-) — GND ― Terminal 1D (RH+) — GND ― Terminal 1F (RH-) — GND For rear speakers ― 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.
4		No	Go to the step 6.
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). For door speakers ― Terminal 3D (LH+) — Terminal 1A (LH+) ― Terminal 3C (LH-) — Terminal 1C (LH-) ― Terminal 3F (RH+) — Terminal 1D (RH+) ― Terminal 3E (RH-) — Terminal 1F (RH-) For rear speakers ― Terminal 3H (LH+) — Terminal 1S (LH+) ― Terminal 3G (LH-) — Terminal 1U (LH-) ― Terminal 3J (RH+) —Terminal 1V (RH+) ― Terminal 3I (RH-) — Terminal 1X (RH-) • Is there continuity?	Yes	Go to the next step.
5		No	Repair or replace the related wiring harnesses between the audio amplifier and the audio unit. Go to the next step.
6	• Inspect the connection of the audio amplifier connector (16-pin, 8-pin). • Is the connector connected securely?	Yes	Go to the next step.
6		No	Connect the audio amplifier connector (16-pin, 8-pin) securely.
7	• Disconnect the audio amplifier (8-pin, 16-pin) and the speaker connector. • Inspect the continuity between the following terminals of the audio amplifier connector and the speaker connector. For door speaker ― Terminal 1H (LH+)— Terminal B ― Terminal 1G (LH-)— Terminal A ― Terminal 1D (RH+)— Terminal B ― Terminal 1C (RH-)— Terminal A For door upper speaker ― Terminal 2D (LH+)— Terminal B ― Terminal 2B (LH-)— Terminal A ― Terminal 2M (RH+)— Terminal B ― Terminal 2O (RH-)— Terminal A For rear speakers ― Terminal 2E (+)— Terminal B ― Terminal 2G (-)— Terminal A For center speaker ― Terminal 2I (+)— Terminal B ― Terminal 2K (-)— Terminal A • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the related wiring harnesses.
8	• Inspect the continuity between the following terminals of the audio amplifier wiring harness-side connector (8-pin, 16-pin) and ground. For door speakers ― Terminal 1H (LH+) — GND ― Terminal 1G (LH-) — GND ― Terminal 1D (RH+) — GND ― Terminal 1C (RH-) — GND For door upper speakers ― Terminal 2D (LH+) — GND ― Terminal 2B (LH-) — GND ― Terminal 2M (RH+) — GND ― Terminal 2O (RH-) — GND For rear speakers ― Terminal 2E (+) — GND ― Terminal 2G (-) — GND For center speaker ― Terminal 2I (+) — GND ― Terminal 2K (-) — GND • Is there continuity?	Yes	Repair or replace for a short circuit between the audio amplifier and speaker wiring harnesses or inside the speaker. Note • If there is a short circuit between the speaker wiring harnesses or the speaker lead wire and ground, the protector circuit inside the audio amplifier operates to cut the sound.
8		No	Go to the next step.
9	• 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 amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)
9		No	Replace the speaker.