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

id0902f6441700

DESCRIPTION | Audio unit power supply voltage is low
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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 ― MIRROR 7.5 A fuse malfunction ― MAIN 150 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 • Audio unit terminal 1B—Battery positive terminal • Audio unit malfunction

Diagnostic Procedure

Step | Inspection | Action
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1 | CONFIRM PCM DTC • Perform the DTC Reading Procedure to confirm the PCM DTC. (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
No | Go to the next step.
2 | INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION [MZI-3.7].) • Is there any malfunction? | Yes | Recharge or replace the battery, then go to Step 6. (See BATTERY RECHARGING [MZI-3.7].) (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].)
No | Go to the next step.
3 | INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [MZI-3.7].) • Is there any malfunction? | Yes | Replace the generator, then go to Step 6. (See GENERATOR REMOVAL/INSTALLATION [MZI-3.7].)
No | Go to the next step.
4 | INSPECT AUDIO UNIT CONNECTOR CONDITION • Turn the ignition switch to the OFF 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 ON 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 MAIN 150 A or ROOM 15 A fuse or MIRROR 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 • Turn the ignition switch to the OFF 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.