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STEP
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INSPECTION
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ACTION
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1
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• Turn the audio unit to ON.
• Press AUDIO CONT button more than one second (BAL/FAD cancel mode).
• Press both POWER and AUTO-M buttons more than 1 second at the same time.
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Note
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The sounded speaker now changes in the order of left -front speaker, right-front speaker, right-rear speaker and left-rear speaker.
• Is there any speaker with no sound?
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Yes
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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 at all"
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No
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The troubleshooting is completed.
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2
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• Does the same speaker have no sound if changing the sound source? (radio, CD, cassette tape).
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Yes
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Go to the next step.
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No
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Replace the audio unit.
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Note
• If the different speaker has no sound now, the audio unit is malfunctioning.
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3
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• 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?
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Yes
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Go to the next step.
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No
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Connect the audio unit connector (24-pin) securely.
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4
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• 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 connector wiring harness-side connector terminal and ground:
For front speaker
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- Terminal A (LH+) - GND
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- Terminal C (LH-) - GND
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- Terminal D (RH+) - GND
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- Terminal F (RH-) - GND
For rear speaker
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- Terminal S (LH+) - GND
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- Terminal U (LH-) - GND
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- Terminal V (RH+) - GND
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- Terminal X (RH-) - GND
- Is there continuity?
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Yes
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Go to the next step.
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No
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Go to the Step 6.
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5
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• Turn the ignition switch to the LOCK position.
• Disconnect the BOSE amplifier unit connector (26-pin) and the audio unit connector (24-pin).
• Inspect the continuity between the BOSE amplifier unit wiring harness-side connector (26-pin) terminal and the audio unit wiring harness-side connector (24-pin) terminal.
For front speaker
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- Terminal H (26-pin, L+IN) - Terminal A (24-pin, LH+)
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- Terminal G (26-pin, L+IN) - Terminal C (24-pin, LH+)
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- Terminal L (26-pin, R+IN) - Terminal D (24-pin, RH+)
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- Terminal K (26-pin, R+IN) - Terminal F (24-pin, RH+)
For rear speaker
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- Terminal J (26-pin, L+IN) - Terminal S (24-pin, LH+)
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- Terminal I (26-pin, L+IN) - Terminal U (24-pin, LH+)
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- Terminal N (26-pin, R+IN) - Terminal V (24-pin, RH+)
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- Terminal M (26-pin, R+IN) - Terminal X (24-pin, RH+)
- Is there the continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the suspect wiring harness between the BOSE amplifier unit and audio unit. Go to the next step.
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6
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• Turn the ignition switch to the LOCK position.
• Inspect the connection of the BOSE amplifier unit connector (26-pin).
• Is the connector connected securely?
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Yes
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Go to the next step.
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No
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Connect the BOSE amplifier unit connector (26-pin) securely.
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7
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• Turn the ignition switch to the LOCK position.
• Disconnect the BOSE amplifier unit connector (26-pin).
• Inspect the continuity between the BOSE amplifier unit wiring harness-side connector (26-pin) terminal and the ground.
For front speaker
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- Terminal B (26-pin, L+) - Ground
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- Terminal D (26-pin, L-) - Ground
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- Terminal W (26-pin, R+) - Ground
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- Terminal Y (26-pin, R-) - Ground
For rear speaker
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- Terminal C (26-pin, L+) - Ground
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- Terminal A (26-pin, L-) - Ground
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- Terminal X (26-pin, R+) - Ground
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- Terminal Z (26-pin, R-) - Ground
- Is there the continuity?
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Yes
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Repair or replace the short circuit between the BOSE amplifier unit and speaker harness or inside the speaker unit.
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Note
• If there is a short circuit between the speaker harness or speaker lead wire and ground, the protector circuit inside the BOSE amplifier unit operates to cut the sound.
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No
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Go to the next step.
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8
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• Remove the suspect speaker.
• Disconnect the speaker connector (2-pin) and inspect the resistance of speaker.
• Is the resistance normal?
Specification
• Speaker resistance + wiring harness resistance
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Yes
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Replace the BOSE amplifier unit.
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No
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Go to the next step.
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9
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• Inspect the suspect speaker.
• Is the speaker normal?
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Note
• If the speaker lead wire contacts to either ground or vehicle frame, replace the speaker.
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Yes
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Replace the BOSE amplifier unit.
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No
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Go to the next step.
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