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STEP
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INSPECTION
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ACTION
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1
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• Is all the illumination on the audio unit turned off?
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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 center panel.
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2
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• Turn the ignition switch to the LOCK position.
• Inspect the fuse (ILLUMI).
• Is the fuse normal?
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Yes
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Go to the Step 4.
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No
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Go to the next step.
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3
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• Turn the ignition switch to the LOCK position.
• Disconnect the audio unit connector (24-pin) and inspect the continuity between the audio unit wiring harness-side connector terminal E (TNS) and the ground.
• Is there continuity?
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Yes
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Repair or replace the short circuit in the suspect wiring harness. After repairing the wiring harness, replace with the appropriate standard fuse.
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No
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Go to the next step.
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4
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• Inspect the connection of the audio unit connector (24-pin).
• Inspect both the audio unit and wiring harness-side connector terminal E for a poor connection (such as damaged/pulled-out pins, corrosion).
• Are all the pins normal?
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Yes
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Go to the next step.
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No
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If audio unit connector has a poor connection:
• Securely connect the audio unit connector.
If the audio unit side connector is malfunctioning:
• Replace the audio unit.
If the wiring harness-side connector is malfunctioning:
• Repair or replace the pins and/or the connector.
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5
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• Connect the audio unit connector (24-pin).
• Turn the ignition switch to the ACC position.
• Inspect the voltage at the audio unit connector terminal E (TNS).
• Is the voltage B+ when the light switch is turned to the TNS position?
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Yes
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Replace the audio unit.
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No
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Repair or replace the related wiring harness (TNS signal).
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