NO.2 NO POWER TO THE ENTIRE AUDIO SYSTEM [ENTIRE AUDIO SYSTEM]

id0903e2817800

2

No power to the entire audio system

Possible DTC

Using the M-MDS

U3000:16

Without using M-MDS (On-board diagnostic test mode)

09:Er20
Possible cause
•  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
1
•  Switch the ignition to off.
•  Inspect the following fuses:
―  ROOM 15 A
―  AUDIO 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.
2
•  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.
If the wiring harness-side connector is wrong:
•  Repair or replace the pins and/or the connector.
3
•  Connect the audio unit connector.
•  Inspect the voltage for the power supply line (B+, ACC).
Specification:
Switch the ignition to ON: 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.
4
•  Switch the ignition to off.
•  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.)
(See AUDIO UNIT DISASSEMBLY/ASSEMBLY.)
No
Repair or replace the wiring harness.