NO.9 NO AUDIO SYSTEM ILLUMINATION [ENTIRE AUDIO SYSTEM]
id0903e2826600
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9 |
Audio system illumination does not illuminate at all |
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Possible DTC |
With M-MDS |
U3003:16 |
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Without M-MDS |
Audio unit
• 09:Er20
Car-navigation unit
• Device code 09/Error code 20
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POSSIBLECAUSE
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• Poor connection of audio unit/car-navigation unit connector, terminal damage
• Audio unit malfunction (with audio system)
• Car-navigation unit malfunction (with car-navigation system)
• Burnt fuse (TNS signal)
• Open or short circuit in TNS signal wiring harness
• Audio panel malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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• Are all 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 audio panel.
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2
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• Switch the ignition to off.
• Inspect the fuse (ILLUMI).
• Is the fuse normal?
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Yes
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Go to 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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• Disconnect the audio unit connector (24-pin) and inspect the continuity between the audio unit/car-navigation unit wiring harness-side connector terminal 1E (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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4
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• Inspect the connection of the audio unit/car-navigation unit connector (24-pin).
• Inspect both the audio unit/car-navigation unit and wiring harness-side connector terminal 1E 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/car-navigation unit connector:
• Securely connect the audio unit/car-navigation unit connector.
If the audio unit/car-navigation unit side connector is wrong:
• Replace the audio unit (with audio system).
• Replace the car-navigation unit (with car-navigation system).
If the wiring harness-side connector is wrong:
• Repair or replace the pins and/or the connector.
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5
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• Connect the audio unit/car-navigation unit connector (24-pin).
• Switch the ignition to ACC.
• Inspect the voltage at the audio unit connector terminal 1E (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 (with audio system).
Replace the car-navigation unit (with car-navigation system)
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No
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Repair or replace the suspect wiring harness (TNS signal).
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