DTC: U3003:16, 09:Er20 [AUDIO]SM2445913
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 terminal F
• Audio unit terminal 1B—Battery positive terminal
― P.MIR 7.5 A fuse malfunction
― IG KEY1 40A fuse malfunction
― ROOM 15 A fuse malfunction
― Open circuit in wiring harness between the following terminal:
• Audio unit terminal 1R—Ignition switch terminal F
• Audio unit terminal 1B—Battery positive terminal
• Audio unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
CONFIRM PCM DTC
• Perform the DTC inspection to confirm the PCM DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L5].) (See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].) (See ON-BOARD DIAGNOSTIC TEST [MZR-CD 2.2].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [L5].)
(See DTC TABLE [L3 Turbo].)
(See DTC TABLE [MZR-CD 2.2].)
No
Go to the next step.
2
INSPECT BATTERY
• Inspect the battery. (See BATTERY INSPECTION [L5].) (See BATTERY INSPECTION [L3 Turbo].) (See BATTERY INSPECTION [MZR-CD 2.2].)
• Is there any malfunction?
Yes
Recharge or replace the battery, then go to Step 6.
(See BATTERY RECHARGING [L5].)
(See BATTERY RECHARGING [L3 Turbo].)
(See BATTERY RECHARGING [MZR-CD 2.2].)
(See BATTERY REMOVAL/INSTALLATION [L5].)
(See BATTERY REMOVAL/INSTALLATION [L3 Turbo].)
(See BATTERY REMOVAL/INSTALLATION [MZR-CD 2.2].)
No
Go to the next step.
3
INSPECT GENERATOR
• Inspect the generator. (See GENERATOR INSPECTION [L5].) (See GENERATOR INSPECTION [L3 Turbo].) (See GENERATOR INSPECTION [MZR-CD 2.2].)
• Is there any malfunction?
Yes
Replace the generator, then go to Step 6.
(See GENERATOR REMOVAL/INSTALLATION [L5].)
(See GENERATOR REMOVAL/INSTALLATION [L3 Turbo].)
(See GENERATOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
No
Go to the next step.
4
INSPECT AUDIO UNIT CONNECTOR CONDITION
• Turn the ignition switch to the LOCK position.
• 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.
• Turn the ignition switch to the ACC position.
• 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 IG KEY1 40A fuse or ROOM 15 A fuse or P.MIR 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 Step 5.
6
VERIFY TROUBLESHOOTING COMPLETED
• Turn the ignition switch to the LOCK position.
• Make sure reconnect the disconnected connectors.
• Reconnect the negative battery cable.
• Clear the DTC from the audio unit memory. (See CLEARING DTC [AUDIO].)
• Perform the audio unit DTC inspection. (See DTC INSPECTION [AUDIO].)
• 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.