DTC: 09:Er21 [AUDIO]

id0902f6446100

DESCRIPTION

Audio unit internal malfunction
DETECTION CONDITION
•  Audio unit internal ECU (Power amplifier peripheral circuit) is faulted.
•  Audio unit protection function operates due to short to ground in speaker wiring harness and speaker lead wire
POSSIBLE CAUSE
•  Audio unit connector or terminals malfunction
•  Speaker connector or terminals malfunction
•  Open circuit in wiring harness between the following terminals:
―  Audio unit terminal 1P—Front door speaker (LH) terminal C
―  Audio unit terminal 1N—Front door speaker (LH) terminal B
―  Audio unit terminal 1Q—Front door speaker (RH) terminal C
―  Audio unit terminal 1O—Front door speaker (RH) terminal B
―  Audio unit terminal 1L—Rear door speaker (LH) terminal C
―  Audio unit terminal 1J—Rear door speaker (LH) terminal B
―  Audio unit terminal 1M—Rear door speaker (RH) terminal C
―  Audio unit terminal 1K—Rear door speaker (RH) terminal B
•  Short to ground in wiring harness between the following terminals:
―  Audio unit terminal 1P—Front door speaker (LH) terminal C
―  Audio unit terminal 1N—Front door speaker (LH) terminal B
―  Audio unit terminal 1Q—Front door speaker (RH) terminal C
―  Audio unit terminal 1O—Front door speaker (RH) terminal B
―  Audio unit terminal 1L—Rear door speaker (LH) terminal C
―  Audio unit terminal 1J—Rear door speaker (LH) terminal B
―  Audio unit terminal 1M—Rear door speaker (RH) terminal C
―  Audio unit terminal 1K—Rear door speaker (RH) terminal B
•  Speaker malfunction
•  Audio unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT AUDIO UNIT CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  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 6.
No
Go to the next step.
2
INSPECT SPEAKER CONNECTOR CONDITION
•  Disconnect the speaker 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 6.
No
Go to the next step.
3
INSPECT SPEAKER CIRCUIT FOR OPEN CIRCUIT
•  Audio unit connector and speaker connector are disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness).
―  Audio unit terminal 1P and front door speaker (LH) terminal C
―  Audio unit terminal 1N and front door speaker (LH) terminal B
―  Audio unit terminal 1Q and front door speaker (RH) terminal C
―  Audio unit terminal 1O and front door speaker (RH) terminal B
―  Audio unit terminal 1L and rear door speaker (LH) terminal C
―  Audio unit terminal 1J and front door speaker (LH) terminal B
―  Audio unit terminal 1M and rear door speaker (RH) terminal C
―  Audio unit terminal 1K and rear door speaker (RH) terminal B
•  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 (vehicle wiring harness side).
•  Audio unit terminal 1P and front door speaker (LH) terminal C
•  Audio unit terminal 1N and front door speaker (LH) terminal B
•  Audio unit terminal 1Q and front door speaker (RH) terminal C
•  Audio unit terminal 1O and front door speaker (RH) terminal B
•  Audio unit terminal 1L and rear door speaker (LH) terminal C
•  Audio unit terminal 1J and front door speaker (LH) terminal B
•  Audio unit terminal 1M and rear door speaker (RH) terminal C
•  Audio unit terminal 1K and rear door speaker (RH) terminal B
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 Step 6.
4
INSPECT SPEAKER CIRCUIT FOR SHORT TO GROUND
•  Inspect for continuity between the following wiring harness terminals (vehicle wiring harness side) and body ground.
―  Speaker terminal C
―  Speaker terminal B
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals (vehicle wiring harness side).
•  Speaker terminal C
•  Speaker terminal B
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 6.
No
Go to the next step.
5
INSPECT SPEAKERS
•  Inspect the speakers.
•  Is there any malfunctioning part?
Yes
Replace the speaker, then go to Step 6.
(See FRONT DOOR SPEAKER REMOVAL/INSTALLATION.)
(See REAR DOOR SPEAKER REMOVAL/INSTALLATION.)
No
Go to the next step.
6
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Reconnect all the disconnected connectors.
•  Connect the negative battery cable.
•  Clear the audio unit DTCs.
•  Perform the audio unit DTC inspection.
•  Is the same DTC displayed?
Yes
Return to Step 1 and inspect for other possible causes. If the malfunction recurs, replace the audio unit, then go to the next step.
(See AUDIO UNIT REMOVAL/INSTALLATION.)
No
Go to the next step.
7
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].)
No
DTC troubleshooting completed.