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

id0902f6441700


Except SKYACTIV-G 2.0

DESCRIPTION

Audio unit power supply voltage is low
DETECTION CONDITION
Audio unit power supply voltage of less than 10 V is detected continuously for 10 s.
POSSIBLE CAUSE
•  PCM DTC is stored
•  Battery malfunction
•  Generator malfunction
•  Audio unit connector or terminals malfunction
•  Open circuit or short to ground in audio unit power supply circuit
―  Short to ground in wiring harness between the following terminal:
•  Audio unit terminal 1R—Ignition switch terminal F*1/Relay block terminal 2B*2
•  Audio unit terminal 1B—Battery positive terminal
―  AUDIO 7.5 A fuse malfunction
―  ROOM 15 A fuse malfunction
―  Open circuit in wiring harness between the following terminal:
•  Audio unit terminal 1R—Ignition switch terminal F*1/Relay block terminal 2B*2
•  Audio unit terminal 1B—Battery positive terminal
•  Audio unit malfunction

*1  :Vehicles without advanced keyless entry and push button start system
*2  :Vehicles with advanced keyless entry and push button start system

Diagnostic Procedure

Step

Inspection

Action
1
CONFIRM PCM DTC
•  Perform the DTC Reading Procedure to confirm the PCM DTC.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.5, MZR 1.6].)
(See DTC TABLE [MZR 2.0 DISI i-stop].)
(See DTC TABLE [MZR 2.3 DISI Turbo].)
(See DTC TABLE [MZR 2.0, MZR 2.5].)
(See DTC TABLE [MZR-CD 2.2].)
(See DTC TABLE [MZ-CD 1.6].)
No
Go to the next step.
2
INSPECT BATTERY
•  Inspect the battery.
•  Is there any malfunction?
Yes
Recharge or replace the battery, then go to Step 6.
(See BATTERY RECHARGING [MZR 1.5, MZR 1.6].)
(See BATTERY RECHARGING [MZR 2.3 DISI Turbo].)
(See BATTERY RECHARGING [MZR 2.0 DISI i-stop].)
(See BATTERY RECHARGING [MZR 2.0, MZR 2.5].)
(See BATTERY RECHARGING [MZR-CD 2.2].)
(See BATTERY RECHARGING [MZ-CD 1.6].)
(See BATTERY REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].)
(See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
(See BATTERY REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
(See BATTERY REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
(See BATTERY REMOVAL/INSTALLATION [MZR-CD 2.2].)
(See BATTERY REMOVAL/INSTALLATION [MZ-CD 1.6].)
No
Go to the next step.
3
INSPECT GENERATOR
•  Inspect the generator.
•  Is there any malfunction?
Yes
Replace the generator, then go to Step 6.
(See GENERATOR REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].)
(See GENERATOR REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
(See GENERATOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
(See GENERATOR REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
(See GENERATOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
(See GENERATOR REMOVAL/INSTALLATION [MZ-CD 1.6].)
No
Go to the next step.
4
INSPECT AUDIO UNIT CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the audio unit connector.
•  Inspect the connector for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminal, then go to Step 6.
No
Go to the next step.
5
INSPECT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND
•  Audio unit connector is disconnected.
•  Reconnect the negative battery cable.
•  Switch the ignition to ON.
•  Measure the voltage at the following terminals (wiring harness-side):
―  Audio unit terminal 1B
―  Audio unit terminal 1R
•  Is the voltage B+?
Yes
Go to the next step.
No
If the audio unit terminal 1B or 1R voltage is not B+:
•  Inspect the ROOM 15 A fuse or AUDIO 7.5 A fuse.
―  If the fuse is melt:
•  Repair or replace the wiring harness for a possible short to ground.
•  Replace the malfunctioning fuse.
―  If the fuse is deterioration:
•  Replace the malfunctioning fuse.
―  If the fuse is normal:
•  Repair or replace the wiring harness for a possible open circuit.
Go to the next step.
6
VERIFY TROUBLESHOOTING COMPLETED
•  Switch the ignition to off.
•  Make sure reconnect the disconnected connectors.
•  Reconnect the negative battery cable.
•  Reconnect the negative battery cable.
•  Clear the DTC from the audio unit memory.
•  Perform the audio unit DTC inspection.
•  Is the same 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.
7
VERIFY THAT NO OTHER DTCs ARE RECORDED
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [AUDIO].)
No
DTC troubleshooting completed.


SKYACTIV-G 2.0

DESCRIPTION

Audio unit power supply voltage is low
DETECTION CONDITION
Audio unit power supply voltage of less than 10 V is detected continuously for 10 s.
POSSIBLE CAUSE
•  PCM DTC is stored
•  Battery malfunction
•  Generator malfunction
•  ACC relay malfunction
•  Audio unit connector or terminals malfunction
•  Short to ground in wiring harness between ACC relay terminal C and Audio unit terminal 1R
•  Open circuit in wiring harness between ACC relay terminal C and Audio unit terminal 1R
•  AUDIO2 7.5 A fuse malfunction
•  ROOM2 15 A fuse malfunction
•  DC-DC converter connector or terminals malfunction
•  Short to ground in wiring harness between ACC relay terminal D and DC-DC converter terminal K
•  Open circuit in wiring harness between ACC relay terminal D and DC-DC converter terminal K
•  Short to ground in wiring harness between audio unit terminal 1B and DC-DC converter terminal K
•  Open circuit in wiring harness between audio unit terminal 1B and DC-DC converter terminal K
•  DCDC SUB 20 A fuse malfunction
•  DC-DC converter malfunction
•  Audio unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
CONFIRM PCM DTC
•  Perform the DTC Reading Procedure to confirm the PCM DTC.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [SKYACTIV-G 2.0].)
No
Go to the next step.
2
INSPECT BATTERY
•  Inspect the battery.
•  Is there any malfunction?
Yes
Recharge or replace the battery, then go to Step 13.
(See BATTERY RECHARGING [SKYACTIV-G 2.0].)
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
No
Go to the next step.
3
INSPECT GENERATOR
•  Inspect the generator.
•  Is there any malfunction?
Yes
Replace the generator, then go to Step 13.
(See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
No
Go to the next step.
4
VERIFY MALFUNCTIONING LOCATION
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Remove the ACC relay.
•   Reconnect the negative battery cable.
•  Measure the voltage at the ACC relay terminal D (wiring harness-side).
•  Is the voltage B+?
Yes
Go to the next step.
No
Go to Step 9.
5
INSPECT ACC RELAY
•  Inspect the ACC relay.
•  Is there any malfunction?
Yes
Replace the ACC relay, then go to Step 13.
(See RELAY BLOCK REMOVAL/INSTALLATION [WITH ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM].)
No
Go to the next step.
6
INSPECT AUDIO UNIT CONNECTOR AND TERMINALS
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the audio unit connector.
•  Inspect the connector for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminal, then go to Step 13.
No
Go to the next step.
7
INSPECT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND
•  Verify that the audio unit connector is disconnected.
•  Verify that the ACC relay is removed.
•  Inspect for continuity between audio unit terminal 1R (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground.
Replace the fuse if necessary, then go to Step 13.
No
Go to the next step.
8
INSPECT AUDIO UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
•  Verify that the audio unit connector is disconnected.
•  Verify that the ACC relay is removed.
•  Inspect for continuity between ACC relay terminal C (wiring harness-side) and audio unit terminal 1R (wiring harness-side).
Yes
Go to Step 13.
No
Repair or replace the wiring harness for a possible open circuit.
Replace the fuse if necessary, then go to Step 13.
9
INSPECT DC-DC CONVERTER CONNECTOR AND TERMINALS
•  Disconnect the negative battery cable.
•  Disconnect the DC-DC converter connector.
•   Inspect the connector for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 13.
No
Go to the next step.
10
INSPECT AUDIO UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND
•  Verify that the DC-DC converter connector is disconnected.
•  Verify that the ACC relay is removed.
•  Inspect for continuity between ACC relay terminal D (wiring harness-side) and body ground.
•  Inspect for continuity between audio unit terminal 1R (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground.
Replace the fuse if necessary, then go to Step 13.
No
Go to the next step.
11
INSPECT AUDIO UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
•  Verify that the DC-DC converter connector is disconnected.
•  Verify that the ACC relay is removed.
•  Inspect for continuity between ACC relay terminal D (wiring harness-side) and DC-DC converter terminal K (wiring harness-side).
•  Inspect for continuity between audio unit terminal 1R (wiring harness-side) and DC-DC converter terminal K (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible short to ground.
Replace the fuse if necessary, then go to Step 13.
12
INSPECT DC-DC CONVERTER
•  Inspect the DC-DC converter.
•  Is there any malfunction?
Yes
Replace the DC-DC converter, then go to the next step.
(See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
No
Go to the next step.
13
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure reconnect the disconnected connectors.
•  Reconnect the negative battery cable.
•  Reconnect the negative battery cable.
•  Clear the DTC from the audio unit memory.
•  Perform the audio unit DTC inspection.
•  Is the same 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.
14
VERIFY THAT NO OTHER DTCs ARE RECORDED
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [AUDIO].)
No
DTC troubleshooting completed.