DTC: U3003:16, 09:Er20 [AUDIO]

id0902f6441700

Without i-stop System

Description

Voltage decrease input from battery

Detection condition

With the ignition switched to ACC or ON, the audio unit detects voltage from the battery of 10 V or less for 30 s or more.

Fail-safe function

—

Possible cause

•  Battery malfunction

•  Generator malfunction

•  Audio unit connector or terminal malfunction

•  Audio unit power supply circuit malfunction

―  Short to ground in the wiring harness between audio unit terminal 1B and battery (+) terminal.

―  Short to ground in wiring harness between audio unit terminal 1R and ACC relay

―  AUDIO1 15 A fuse malfunction

―  AUDIO2 15 A fuse malfunction

―  CABIN. +B 50 A fuse malfunction

―  MAIN 200 A fuse malfunction

―  Open circuit in wiring harness between audio unit terminal 1B and battery (+) terminal

―  Open circuit in wiring harness between audio unit terminal 1R and ACC relay

•  Audio unit malfunction

Description	Voltage decrease input from battery
Detection condition	With the ignition switched to ACC or ON, the audio unit detects voltage from the battery of 10 V or less for 30 s or more.
Fail-safe function	—
Possible cause	• Battery malfunction • Generator malfunction • Audio unit connector or terminal malfunction • Audio unit power supply circuit malfunction ― Short to ground in the wiring harness between audio unit terminal 1B and battery (+) terminal. ― Short to ground in wiring harness between audio unit terminal 1R and ACC relay ― AUDIO1 15 A fuse malfunction ― AUDIO2 15 A fuse malfunction ― CABIN. +B 50 A fuse malfunction ― MAIN 200 A fuse malfunction ― Open circuit in wiring harness between audio unit terminal 1B and battery (+) terminal ― Open circuit in wiring harness between audio unit terminal 1R and ACC relay • Audio unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY PCM DTCs • Perform the DTC inspection for the PCM using the M-MDS. (See FOREWORD [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (L.H.D.)].) (See FOREWORD [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (R.H.D.)].) • Is the DTC displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
1		No	Go to the next step.
2	INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) • Is there any malfunctioning part?	Yes	Recharge or replace the battery, then go to Step 8. (See BATTERY RECHARGING [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
2		No	Go to the next step.
3	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunctioning part?	Yes	Replace the generator, then go to Step 8. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
3		No	Go to the next step.
4	INSPECT AUDIO UNIT CONNECTOR CONDITION • Switch the ignition off (LOCK). • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) • 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 8.
4		No	Go to the next step.
5	INSPECT POWER SUPPLY CIRCUIT OF AUDIO UNIT FOR MALFUNCTION • Verify that the following audio unit connectors are disconnected. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) • Switch the ignition to ACC (engine off). • Measure the voltage at the following terminals (vehicle wiring harness side). ― Audio unit terminal 1B ― Audio unit terminal 1R • Is the voltage B+?	Yes	Go to Step 8.
5		No	• Terminal 1B voltage is not B+ ― Go to Step 7. • Terminal 1R voltage is not B+ ― Go to the next step.
6	INSPECT AUDIO UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • Switch the ignition off (LOCK). • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) • Inspect the AUDIO2 15 A fuse. • Is there any malfunctioning part?	Yes	• If a fuse is burnt out: ― Repair or replace the wiring harness which is shorted to ground. ― Replace the malfunctioning fuse. • If a fuse is damaged: ― Replace the malfunctioning fuse.
6		No	Repair or replace the wiring harness which is shorted to ground, then go to Step 8.
7	INSPECT AUDIO UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • Switch the ignition off (LOCK). • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) • Inspect the CABIN. +B 50 A fuse, AUDIO1 15A fuse and MAIN 200 A fuse. • Is there any malfunctioning part?	Yes	• If a fuse is burnt out: ― Repair or replace the wiring harness which is shorted to ground. ― Replace the malfunctioning fuse. • If a fuse is damaged: ― Replace the malfunctioning fuse.
7		No	Repair or replace the wiring harness which has a short to ground, then go to the next step.
8	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Switch the ignition off (LOCK). • Reconnect all the disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) • Clear the audio unit DTCs. (See CLEARING DTC [AUDIO].) • Perform the audio unit DTC inspection. (See DTC INSPECTION [AUDIO].) • 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.)
8		No	Go to the next step.
9	VERIFY IF OTHER DTCs DISPLAYED • Verify if other DTCs are displayed. • Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [AUDIO].)
9		No	DTC troubleshooting completed.

With i-stop System

Description

Voltage decrease input from battery

Detection condition

With the ignition switched to ACC or ON, the audio unit detects voltage from the battery of 10 V or less for 30 s or more.

Fail-safe function

—

Possible cause

•  Battery malfunction

•  Generator malfunction

•  Audio unit connector or terminal malfunction

•  Audio unit power supply circuit malfunction

―  Short to ground in wiring harness between AUDIO1 15A fuse and audio unit terminal 1B

―  AUDIO1 15 A fuse malfunction

―  AUDIO2 7.5 A fuse malfunction

―  Open circuit between audio unit terminal 1R and ignition relay (ACC_STAB) terminal C

•  Ignition relay (ACC_STAB) malfunction

•  DC-DC converter connector terminal malfunction

•  Open circuit in wiring harness between DC-DC converter terminal K and ignition relay terminal D

•  Short to ground in wiring harness between DC-DC converter terminal K and audio unit terminal 1B

•  Open circuit in wiring harness between DC-DC converter terminal K and audio unit terminal 1B

•  DC-DC converter malfunction

•  Audio unit malfunction

Description	Voltage decrease input from battery
Detection condition	With the ignition switched to ACC or ON, the audio unit detects voltage from the battery of 10 V or less for 30 s or more.
Fail-safe function	—
Possible cause	• Battery malfunction • Generator malfunction • Audio unit connector or terminal malfunction • Audio unit power supply circuit malfunction ― Short to ground in wiring harness between AUDIO1 15A fuse and audio unit terminal 1B ― AUDIO1 15 A fuse malfunction ― AUDIO2 7.5 A fuse malfunction ― Open circuit between audio unit terminal 1R and ignition relay (ACC_STAB) terminal C • Ignition relay (ACC_STAB) malfunction • DC-DC converter connector terminal malfunction • Open circuit in wiring harness between DC-DC converter terminal K and ignition relay terminal D • Short to ground in wiring harness between DC-DC converter terminal K and audio unit terminal 1B • Open circuit in wiring harness between DC-DC converter terminal K and audio unit terminal 1B • DC-DC converter malfunction • Audio unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY PCM DTCs • Perform the DTC inspection for the PCM using the M-MDS. (See FOREWORD [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (L.H.D.)].) (See FOREWORD [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (R.H.D.)].) (See FOREWORD [SKYACTIV-D 2.2 (L.H.D.)].) (See FOREWORD [SKYACTIV-D 2.2 (R.H.D.)].) • Is the DTC displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DTC TABLE [SKYACTIV-D 2.2].)
1		No	Go to the next step.
2	INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY INSPECTION [SKYACTIV-D 2.2].) • Is there any malfunctioning part?	Yes	Recharge or replace the battery, then go to Step 14. (See BATTERY RECHARGING [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY RECHARGING [SKYACTIV-D 2.2].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
2		No	Go to the next step.
3	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See GENERATOR INSPECTION [SKYACTIV-D 2.2].) • Is there any malfunctioning part?	Yes	Replace the generator, then go to Step 14. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
3		No	Go to the next step.
4	INSPECT AUDIO UNIT CONNECTOR CONDITION • Switch the ignition off (LOCK). • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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 14.
4		No	Go to the next step.
5	INSPECT POWER SUPPLY CIRCUIT OF AUDIO UNIT FOR MALFUNCTION • Verify that the following audio unit connectors are disconnected. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Switch the ignition to ACC (engine off). • Measure the voltage at the following terminals (vehicle wiring harness side). ― Audio unit terminal 1B ― Audio unit terminal 1R • Is the voltage B+?	Yes	Go to Step 14.
5		No	Terminal 1B voltage is not B+ • Go to Step 10. Terminal 1R voltage is not B+ • Go to Step 7.
6	INSPECT AUDIO UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • Switch the ignition off (LOCK). • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Inspect the AUDIO1 15 A fuse. • Is there any malfunctioning part?	Yes	• If a fuse is burnt out: ― Repair or replace the wiring harness which is shorted to ground. ― Replace the malfunctioning fuse. • If a fuse is damaged: ― Replace the malfunctioning fuse.
6		No	Repair or replace the wiring harness which is shorted to ground, then go to Step 14.
7	INSPECT AUDIO UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • Switch the ignition off (LOCK). • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Inspect the AUDIO2 7.5 A fuse. • Is there any malfunctioning part?	Yes	• If a fuse is burnt out: ― Repair or replace the wiring harness which is shorted to ground. ― Replace the malfunctioning fuse. • If a fuse is damaged: ― Replace the malfunctioning fuse.
7		No	Repair or replace the wiring harness which is shorted to ground, then go to Step 14.
8	VERIFY MALFUNCTION IN POWER SUPPLY CIRCUIT OF AUDIO UNIT • Verify that the following audio unit connectors are disconnected. • Measure the voltage at ignition relay coil (ACC_STAB) terminal D (vehicle wiring harness side). • Is the voltage B+?	Yes	Go to the next step.
8		No	Go to Step 10.
9	Inspect ignition relay (ACC_STAB). • Switch the ignition off (LOCK). • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Remove the ignition relay (ACC_STAB). (See RELAY LOCATION.) • Inspect ignition relay (ACC_STAB). (See RELAY INSPECTION.) • Is there any malfunctioning part?	Yes	Repair or replace the ignition relay (ACC_STAB), then go to Step 14.
9		No	Go to the next step.
10	INSPECT DC-DC CONVERTER CONNECTOR AND TERMINAL CONDITION • Switch the ignition off (LOCK). • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Disconnect the DC-DC converter 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 14.
10		No	Go to the next step.
11	INSPECT WIRING HARNESS FOR SHORT TO GROUND BETWEEN DC-DC CONVERTER AND IGNITION RELAY • Verify that the DC-DC connector is disconnected. • Inspect for continuity between ignition relay (ACC_STAB) and terminal D (vehicle wiring harness side) and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness which is shorted to ground, then go to Step 14.
11		No	Go to the next step.
12	INSPECT FOR OPEN CIRCUIT IN WIRING HARNESS BETWEEN DC-DC CONVERTER AND IGNITION RELAY • Verify that the DC-DC connector is disconnected. • Inspect for continuity in the wiring harness between the ignition relay (ACC_STAB) terminal D (vehicle wiring harness side) and the DC-DC converter terminal K (vehicle wiring harness side). • Is there continuity?	Yes	Connect the DC-DC connector and go to the next step.
12		No	Repair or replace the wiring harness which has an open circuit, then go to Step 14.
13	INSPECT DC-DC CONVERTER • Inspect the DC-DC converter. (See DC-DC CONVERTER INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DC-DC CONVERTER INSPECTION [SKYACTIV-D 2.2].) • Is there any malfunctioning part?	Yes	Repair or replace the DC-DC converter and go to the next step. (See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
13		No	Go to the next step.
14	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Switch the ignition off (LOCK). • Reconnect all the disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Clear the audio unit DTCs. (See CLEARING DTC [AUDIO].) • Perform the audio unit DTC inspection. (See DTC INSPECTION [AUDIO].) • 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.)
14		No	Go to the next step.
15	VERIFY IF OTHER DTCs DISPLAYED • Verify if other DTCs are displayed. • Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [AUDIO].)
15		No	DTC troubleshooting completed.