NO.4 NO SOUND FROM SOME SPEAKERS [VEHICLES WITH Bose]

4	No sound from some speakers / Possible DTC: -
Troubleshooting hints • Speaker malfunction (e.g., foreign material penetration, damage) • Audio amplifier 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


STEP	INSPECTION		ACTION
1	• Turn the audio unit on. • Press the AUDIO CONT button 1 s or more (BAL/FAD cancel mode). • Press the POWER button and simultaneously press down the SCAN/AUTO-M switch for approx. 2 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 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.) (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.
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 Step 6.
5	• Inspect the continuity between the following terminals of the audio amplifier wiring harness-side connector (24-pin) and the audio unit wiring harness-side connector (24-pin). For door speakers - Terminal 1T (LH+) - Terminal 1A (LH+) - Terminal 1R (LH-) - Terminal 1C (LH-) - Terminal 1P (RH+) - Terminal 1D (RH+) - Terminal 1N (RH-) - Terminal 1F (RH-) For rear speakers - Terminal 1L (LH+) - Terminal 1S (LH+) - Terminal 1J (LH-) - Terminal 1U (LH-) - Terminal 1H (RH+) -Terminal 1X (RH-) - Terminal 1F (RH-) - Terminal 1V (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 (24-pin, 8-pin). • Is the connector connected securely?	Yes	Go to the next step.
6		No	Connect the audio amplifier connector (24-pin, 8-pin) securely.
7	• Disconnect the audio amplifier (24-pin) and the speaker connector. • Inspect the continuity between the following terminals of the audio amplifier connector (24-pin) and the speaker connector. For door speaker (LH) - Terminal 1M, 1I - Terminal B - Terminal 1K, 1O - Terminal A For door speaker (RH) - Terminal 2C, 2E - Terminal A - Terminal 2D, 2F - Terminal B For rear speakers - Terminal 1U - Terminal B - Terminal 1W - Terminal A For center speaker - Terminal 1Q - Terminal B - Terminal 1S - 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 (24-pin) and ground. For door speakers - Terminal 1M (LH OUT+) - GND - Terminal 1K (LH OUT-) - GND - Terminal 1I (LH OUT-) - GND - Terminal 1O (LH OUT+) - GND - Terminal 2C (RH OUT-) - GND - Terminal 2D (RH OUT+) - GND - Terminal 2F (RH OUT+) - GND - Terminal 2E (RH OUT-) - GND For rear speakers - Terminal 1U (LH OUT+) - GND - Terminal 1W (RH OUT-) - GND For center speaker - Terminal 1Q (OUT+) - GND - Terminal 1S (OUT-) - GND • Is there continuity?	Yes	Repair or replace for a short circuit between the audio amplifier and speaker wiring harnesses or inside the speaker unit. 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	• 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 Note • If the speaker lead wire contacts either the ground or vehicle frame, replace the speaker.	Yes	Replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)
9		No	Replace the speaker. (See DOOR SPEAKER REMOVAL/INSTALLATION.) (See REAR SPEAKER REMOVAL/INSTALLATION.) (See CENTER SPEAKER REMOVAL/INSTALLATION.)