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

id0902f6441700

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 (ACC)*1/ACC relay*2
•  Audio unit terminal 1B—Battery positive terminal
―  MIRROR 5 A fuse malfunction
―  MAIN 125 A fuse malfunction
―  BTN 40 A fuse malfunction
―  ROOM 15 A fuse malfunction
―  Open circuit in wiring harness between the following terminal:
•  Audio unit terminal 1R— Ignition switch (ACC)*1/ACC relay*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 PCM DTC inspection using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.8, MZR 2.0, MZR 2.5].)
(See DTC TABLE [MZR 2.0 DISI].)
(See DTC TABLE [MZR-CD 2.2].)
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 1.8, MZR 2.0, MZR 2.5].)
(See BATTERY RECHARGING [MZR 2.0 DISI].)
(See BATTERY RECHARGING [MZR-CD 2.2].)
(See BATTERY REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)
(See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI].)
(See BATTERY REMOVAL/INSTALLATION [MZR-CD 2.2].)
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 1.8, MZR 2.0, MZR 2.5].)
(See GENERATOR REMOVAL/INSTALLATION [MZR 2.0 DISI].)
(See GENERATOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
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 ACC.
•  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 MAIN 125 A fuse or BTN 40A fuse or ROOM 15 A fuse or MIRROR 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.
•  Clear the DTC from the audio unit memory.
•  Perform the audio unit DTC inspection.
•  Is the same DTC present?
Yes
Replace the audio unit, then go to the next step.
(See AUDIO UNIT REMOVAL/INSTALLATION.)
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.