DTC: 09:Er21 [AUDIO UNIT]

id09021q446100

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

Fail-safe

Not applicable

Possible cause

•  Audio unit connector or terminals malfunction

•  Speaker connector or terminals malfunction

•  Short to ground in wiring harness between the following terminals:

―  Audio unit terminal 1A—Front door speaker (LH) terminal C

―  Audio unit terminal 1C—Front door speaker (LH) terminal B

―  Audio unit terminal 1D—Front door speaker (RH) terminal C

―  Audio unit terminal 1F—Front door speaker (RH) terminal B

―  Audio unit terminal 1S—Rear door speaker (LH) terminal C

―  Audio unit terminal 1U—Rear door speaker (LH) terminal B

―  Audio unit terminal 1V—Rear door speaker (RH) terminal C

―  Audio unit terminal 1X—Rear door speaker (RH) terminal B

•  Open circuit in wiring harness between the following terminals:

―  Audio unit terminal 1A—Front door speaker (LH) terminal C

―  Audio unit terminal 1C—Front door speaker (LH) terminal B

―  Audio unit terminal 1D—Front door speaker (RH) terminal C

―  Audio unit terminal 1F—Front door speaker (RH) terminal B

―  Audio unit terminal 1S—Rear door speaker (LH) terminal C

―  Audio unit terminal 1U—Rear door speaker (LH) terminal B

―  Audio unit terminal 1V—Rear door speaker (RH) terminal C

―  Audio unit terminal 1X—Rear door speaker (RH) terminal B

•  Speaker malfunction

•  Audio unit malfunction

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
Fail-safe	Not applicable
Possible cause	• Audio unit connector or terminals malfunction • Speaker connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― Audio unit terminal 1A—Front door speaker (LH) terminal C ― Audio unit terminal 1C—Front door speaker (LH) terminal B ― Audio unit terminal 1D—Front door speaker (RH) terminal C ― Audio unit terminal 1F—Front door speaker (RH) terminal B ― Audio unit terminal 1S—Rear door speaker (LH) terminal C ― Audio unit terminal 1U—Rear door speaker (LH) terminal B ― Audio unit terminal 1V—Rear door speaker (RH) terminal C ― Audio unit terminal 1X—Rear door speaker (RH) terminal B • Open circuit in wiring harness between the following terminals: ― Audio unit terminal 1A—Front door speaker (LH) terminal C ― Audio unit terminal 1C—Front door speaker (LH) terminal B ― Audio unit terminal 1D—Front door speaker (RH) terminal C ― Audio unit terminal 1F—Front door speaker (RH) terminal B ― Audio unit terminal 1S—Rear door speaker (LH) terminal C ― Audio unit terminal 1U—Rear door speaker (LH) terminal B ― Audio unit terminal 1V—Rear door speaker (RH) terminal C ― Audio unit terminal 1X—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 terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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.
1		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.
2		No	Go to the next step.
3	INSPECT SPEAKER CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between the following wiring harness terminals (wiring harness-side) and body ground. ― Front door speaker (LH) terminal C ― Front door speaker (LH) terminal B ― Front door speaker (RH) terminal C ― Front door speaker (RH) terminal B ― Rear door speaker (LH) terminal C ― Rear door speaker (LH) terminal B ― Rear door speaker (RH) terminal C ― Rear door speaker (RH) terminal B • Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals: • Audio unit terminal 1A—Front door speaker (LH) terminal C • Audio unit terminal 1C—Front door speaker (LH) terminal B • Audio unit terminal 1D—Front door speaker (RH) terminal C • Audio unit terminal 1F—Front door speaker (RH) terminal B • Audio unit terminal 1S—Rear door speaker (LH) terminal C • Audio unit terminal 1U—Rear door speaker (LH) terminal B • Audio unit terminal 1V—Rear door speaker (RH) terminal C • Audio unit terminal 1X—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 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.
3		No	Go to the next step.
4	INSPECT SPEAKER CIRCUIT FOR OPEN CIRCUIT • Audio unit connector and speaker connector are disconnected. • Inspect for continuity between the following terminals (wiring harness-side). ― Audio unit terminal 1A—Front door speaker (LH) terminal C ― Audio unit terminal 1C—Front door speaker (LH) terminal B ― Audio unit terminal 1D—Front door speaker (RH) terminal C ― Audio unit terminal 1F—Front door speaker (RH) terminal B ― Audio unit terminal 1S—Rear door speaker (LH) terminal C ― Audio unit terminal 1U—Rear door speaker (LH) terminal B ― Audio unit terminal 1V—Rear door speaker (RH) terminal C ― Audio unit terminal 1X—Rear door speaker (RH) terminal B • Is there continuity?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify if there is a common connector between the following terminals: • Audio unit terminal 1A—Front door speaker (LH) terminal C • Audio unit terminal 1C—Front door speaker (LH) terminal B • Audio unit terminal 1D—Front door speaker (RH) terminal C • Audio unit terminal 1F—Front door speaker (RH) terminal B • Audio unit terminal 1S—Rear door speaker (LH) terminal C • Audio unit terminal 1U—Rear door speaker (LH) terminal B • Audio unit terminal 1V—Rear door speaker (RH) terminal C • Audio unit terminal 1X—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.
5	INSPECT SPEAKERS • Inspect the speakers. (See FRONT DOOR SPEAKER INSPECTION.) (See REAR DOOR SPEAKER INSPECTION.) • Is there any malfunctioning part?	Yes	Replace the speaker, then go to the next step. (See FRONT DOOR SPEAKER REMOVAL/INSTALLATION.) (See REAR DOOR SPEAKER REMOVAL/INSTALLATION.)
5		No	Go to the next step.
6	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the audio unit DTCs. (See CLEARING DTC [AUDIO UNIT].) • Perform the audio unit DTC inspection. (See DTC INSPECTION [AUDIO UNIT].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) Go to the next step.
6		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 UNIT].)
7		No	DTC troubleshooting completed.