DTC: 28:Er09 [AUDIO UNIT]
id09021q073500
Description |
No USB playback function file/track |
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Detection condition
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• When USB device connected, connection error detected.
• When USB device connected, audio unit internal malfunction detected.
• When USB device connected, read error detected.
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Fail-safe
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Not applicable
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Possible cause
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• USB device malfunction
• Incompatible USB device (format) used
• Auxiliary jack/USB port connector or terminal malfunction
• Auxiliary jack/USB port malfunction
• Audio unit connector or terminal malfunction
• Short to ground in wiring harness between the following terminals:
• Open circuit in wiring harness between the following terminals:
• Audio unit malfunction
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Diagnostic Procedure
Step |
Inspection |
Action |
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1
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VERIFY IF MALFUNCTIONING LOCATION IS USB DEVICE
• After obtaining the customer's consent, connect a normal USB device that was not used when the malfunction occurred.
• Is the connection detected?
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Yes
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System is normal. (Explain to the customer that there is a malfunction in the USB device which was used or a malfunction occurred due to use of an incompatible USB device (format).)
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No
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Go to the next step.
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2
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INSPECT AUXILIARY JACK/USB PORT CONNECTOR CONDITION
• Switch the ignition off.
• Disconnect the negative battery cable.
• Disconnect the auxiliary jack/USB port connector.
• Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
• Is the connector normal?
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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 connector, then go to Step 7.
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3
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INSPECT AUXILIARY JACK/USB PORT
• Inspect the auxiliary jack/USB port.
• Is the auxiliary jack/USB port normal?
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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 auxiliary jack/USB port, then go to Step 7.
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4
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INSPECT AUDIO UNIT CONNECTOR CONDITION
• Disconnect the audio unit connector.
• Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
• Is the connector normal?
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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 connector, then go to Step 7.
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5
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INSPECT WIRING HARNESS BETWEEN AUDIO UNIT AND AUXILIARY JACK/USB PORT FOR SHORT TO GROUND
• Verify that the auxiliary jack/USB port and audio unit connectors are disconnected.
• Inspect for continuity between the following terminals (wiring harness-side) and body ground:
• Is there continuity?
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Yes
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Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
• Audio unit terminal 3C—Auxiliary jack/USB port terminal UA
• Audio unit terminal 3B—Auxiliary jack/USB port terminal UC
• Audio unit terminal 3D—Auxiliary jack/USB port terminal UB
• Audio unit terminal 3A—Auxiliary jack/USB port terminal UD
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to Step 7.
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No
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Go to the next step.
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6
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INSPECT WIRING HARNESS BETWEEN AUDIO UNIT AND AUXILIARY JACK/USB PORT FOR OPEN CIRCUIT
• Verify that the auxiliary jack/USB port and audio unit connectors are disconnected.
• Inspect for continuity between the following terminals (wiring harness-side):
• 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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Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
• Audio unit terminal 3C—Auxiliary jack/USB port terminal UA
• Audio unit terminal 3B—Auxiliary jack/USB port terminal UC
• Audio unit terminal 3D—Auxiliary jack/USB port terminal UB
• Audio unit terminal 3A—Auxiliary jack/USB port terminal UD
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to the next step.
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7
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VERIFY THAT REPAIRS HAVE BEEN COMPLETED
• Always reconnect all disconnected connectors.
• Connect the negative battery cable.
• Clear the audio unit DTCs.
(See CLEARING DTC [AUDIO UNIT].)
• Perform the audio unit DTC inspection.
(See DTC INSPECTION [AUDIO UNIT].)
• Is the same DTC displayed?
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Yes
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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the audio unit.
Go to the next step.
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No
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Go to the next step.
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8
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VERIFY IF OTHER DTCs DISPLAYED
• Are any other DTCs displayed?
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Yes
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Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [AUDIO UNIT].)
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No
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DTC troubleshooting completed.
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