NO.2 AUDIO POWER IS NOT AVAILABLE OR SWITCHED ON OR OFF AUTOMATICALLY [ENTIRE AUDIO SYSTEM]

id0903e2830300

2 | Audio power is not available or switched on or off automatically
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Possible DTC | Using the M-MDS | U3003:16
Without using M-MDS (On-board diagnostic test mode) | 09:Er20
Possible cause | • Speaker muted by Bluetooth system (hands-free telephone (HF/TEL) system) operation • Mis-operation of steering switches • Burnt fuse (B+) • Burnt fuse (ACC) • Open or short circuit in power supply (B+) wiring harness • Open or short circuit in power supply (ACC) wiring harness • Poor connection of audio unit connector, terminal damage • Audio unit malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | • Does the malfunction occur while the Bluetooth system is operating? | Yes | The system is normal. Explain to the customer that the speaker is muted while the Bluetooth system is operating.
No | Go to the next step.
2 | • Do the steering switches operate? | Yes | The system is normal. Explain to the customer that the cause is mis-operation of the steering switches.
No | Go to the next step.
3 | • Turn the ignition switch to the OFF position. • Inspect the following fuses: ― AUDIO1 15 A ― AUDIO2 7.5 A • Are the fuse normal? | Yes | Go to the next step.
No | Replace with the appropriate standard fuse. • If the fuse is melted, inspect the wiring harness for short to ground. Repair or replace the wiring harness, then replace the fuse.
4 | • Remove the audio unit. • Inspect the connection of the audio unit (24-pin). • Are the connectors securely connected? | Yes | • Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)
No | Securely connect the audio unit and car navigation unit connectors, then go to the next step.
5 | • Verify the malfunction symptom. • Is the malfunction improved? | Yes | Troubleshooting completed.
No | Go to the next step.
6 | • Remove the audio unit (with audio system). • Inspect the connection of the audio unit connector (24-pin). • Disconnect the audio unit connector and inspect both the audio unit and wiring harness-side connectors for poor connection (such as damaged/pulled-out pins, corrosion). ― Terminal 1B (B+) ― Terminal 1R (ACC) ― Terminal 1W (GND) • Are all the pins normal? | Yes | Go to the next step.
No | If poor connection of audio unit connector: • Securely connect the audio unit connector. If the audio unit side connector is wrong: • Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) If the wiring harness-side connector is wrong: • Repair or replace the pins and/or the connector.
7 | • Connect the audio unit connector. • Inspect the voltage for the power supply line (B+, ACC). Specification: Turn the ignition switch to the ON position: 11.5 V or more Idle: 12.5 V or more • Is the voltage normal? | Yes | Go to the next step.
No | Inspect and repair or replace the suspect wiring harness. Charge the battery, if necessary.
8 | • Turn the ignition switch to the OFF position. • Remove the audio unit connector (24-pin). • Inspect the continuity between the audio unit wiring harness-side connector terminal 1W (GND) and the ground. • Is there the continuity? | Yes | • Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)
No | Repair or replace the wiring harness.