NO.9 NO AUDIO SYSTEM ILLUMINATION [ENTIRE AUDIO SYSTEM]
id0903e2826600
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9 |
No audio system illumination |
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Possible DTC |
Using the M-MDS |
U3003:16 |
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Without using M-MDS (On-board diagnostic test mode) |
09:Er20 |
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Possible cause
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• Illumination turned off by panel light control switch operation
• Open or short circuit in TNS signal wiring harness
• Poor connection of audio unit connector, terminal damage
• Audio unit malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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• Has the panel light control switch been operated?
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Yes
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Go to the next step.
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No
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The system is normal. Explain to the customer that the illumination is turned off by the panel light control switch operation.
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2
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• Disconnect the audio unit connector (24-pin) and inspect the continuity between the audio unit wiring harness-side connector terminal 1G (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 repair the 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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3
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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 1G for 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 poor connection of audio unit connector:
• Securely connect the audio unit connector.
If the audio unit side connector is wrong:
• Replace the audio unit.
If the wiring harness-side connector is wrong:
• Repair or replace the pins and/or the connector.
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4
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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 1G (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 suspect wiring harness (TNS signal).
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