Diagnostic procedure
STEP
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INSPECTION
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ACTION
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1
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• 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.
• Is there any speaker that does not output sound?
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Yes
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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".
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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 output no sound if the audio source is changed? (Radio, CD)
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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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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 wiring harness-side connector and ground.
For door speakers
• 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 Step 6.
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5
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• 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
• 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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Repair or replace the related wiring harnesses between the audio amplifier and the audio unit. Go to the next step.
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6
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• Inspect the connection of the audio amplifier connector (24-pin, 8-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 audio amplifier connector (24-pin, 8-pin) securely.
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7
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• 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)
For door speaker (RH)
For rear speakers
For center speaker
• Is there continuity?
|
Yes
|
Go to the next step.
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No
|
Repair or replace the related wiring harnesses.
|
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8
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• Inspect the continuity between the following terminals of the audio amplifier wiring harness-side connector (24-pin) and ground.
For door speakers
• Is there continuity?
|
Yes
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Repair or replace for a short circuit between the audio amplifier and speaker wiring harnesses or inside the speaker unit.
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No
|
Go to the next step.
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9
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• 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
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Yes
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Replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)
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No
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Replace the speaker.
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