DTC: 28:Er01, 28:Er09 [AUDIO UNIT]

id09021q452600

Note
•  "iPod" is a registered trademark of Apple Inc. in the United States and other countries.

Description
•  28:Er01
―  USB mechanism malfunction
•  28:Er09
―  No USB playback function file/track
Detection condition
•  When USB device/iPod connected, connection error detected.
•  When USB device/iPod connected, audio unit internal malfunction detected.
•  When USB device connected, read error detected.
Fail-safe
Not applicable
Possible cause
•  USB device/iPod 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:
―  Audio unit terminal 3A—Auxiliary jack/USB port terminal UD
―  Audio unit terminal 3B—Auxiliary jack/USB port terminal UC
―  Audio unit terminal 3C—Auxiliary jack/USB port terminal UA
―  Audio unit terminal 3D—Auxiliary jack/USB port terminal UB
•  Open circuit in wiring harness between the following terminals:
―  Audio unit terminal 3A—Auxiliary jack/USB port terminal UD
―  Audio unit terminal 3B—Auxiliary jack/USB port terminal UC
―  Audio unit terminal 3C—Auxiliary jack/USB port terminal UA
―  Audio unit terminal 3D—Auxiliary jack/USB port terminal UB
•  Audio unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT USB DEVICE/iPod
•  Connect the USB device/iPod to another vehicle (model/unit).
•  Is the USB device/iPod connection detected/unit plays back.
Yes
Go to the next step.
No
System is normal. (USB device/iPod malfunction or incompatible USB device.)
Go to Step 7.
2
INSPECT AUXILIARY JACK/USB PORT CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  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 there any malfunctioning part?
Yes
Repair or replace the connector, then go to Step 7.
No
Go to the next step.
3
INSPECT AUXILIARY JACK/USB PORT
•  Inspect the auxiliary jack/USB port.
•  Is there any malfunctioning part?
Yes
Replace the auxiliary jack/USB port, then go to Step 7.
(See AUXILIARY JACK/USB PORT REMOVAL/INSTALLATION.)
No
Go to the next step.
4
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 there any malfunctioning part?
Yes
Repair or replace the connector, then go to Step 7.
No
Go to the next step.
5
INSPECT WIRING HARNESS FOR SHORT TO GROUND BETWEEN AUDIO UNIT AND AUXILIARY JACK/USB PORT
•  Verify that the connectors for the audio unit and the auxiliary jack/USB port are disconnected.
•  Inspect for continuity between the following wiring harness terminals (wiring harness-side) and body ground:
―  Auxiliary jack/USB port terminal UD
―  Auxiliary jack/USB port terminal UC
―  Auxiliary jack/USB port terminal UA
―  Auxiliary jack/USB port terminal UB
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals (wiring harness-side):
•  Audio unit terminal 3A—Auxiliary jack/USB port terminal UD
•  Audio unit terminal 3B—Auxiliary jack/USB port terminal UC
•  Audio unit terminal 3C—Auxiliary jack/USB port terminal UA
•  Audio unit terminal 3D—Auxiliary jack/USB port terminal UB
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.
No
Go to the next step.
6
INSPECT WIRING HARNESS FOR OPEN CIRCUIT BETWEEN AUDIO UNIT AND AUXILIARY JACK/USB PORT
•  Verify that the connectors for the audio unit and the auxiliary jack/USB port are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side).
―  Audio unit terminal 3A—Auxiliary jack/USB port terminal UD
―  Audio unit terminal 3B—Auxiliary jack/USB port terminal UC
―  Audio unit terminal 3C—Auxiliary jack/USB port terminal UA
―  Audio unit terminal 3D—Auxiliary jack/USB port terminal UB
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals (wiring harness-side):
•  Audio unit terminal 3A—Auxiliary jack/USB port terminal UD
•  Audio unit terminal 3B—Auxiliary jack/USB port terminal UC
•  Audio unit terminal 3C—Auxiliary jack/USB port terminal UA
•  Audio unit terminal 3D—Auxiliary jack/USB port terminal UB
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.
7
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the audio unit DTCs.
•  Perform the audio unit DTC inspection.
•  Is the same Pending DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the audio unit.
Go to the next step.
No
Go to the next step.
8
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [AUDIO UNIT].)
No
DTC troubleshooting completed.