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Audio System Symptom Troubleshooting - Audio unit power will not turn on (No information display)
Audio unit power will not turn on (No information display)
NOTE:
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Check if the Day/Night (  ) button has been pressed, and turned off the display (see the Owner's Manual for more information). |
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Check the connectors for poor connections or loose terminals. |
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1. |
Problem verification:
Problem verification
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?1. |
Turn the vehicle to the ON mode. |
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?2. |
Check if the audio unit display indicates any information. | |
Is any information displayed?
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Intermittent failure, the system is OK at this time.? |
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The failure is duplicated, go to step 2. |
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2. |
Fuse check:
Fuse check
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?1. |
Turn the vehicle to the OFF (LOCK) mode. |
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?2. |
Check the following fuses.
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Are the fuses OK?
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Replace the fuse(s), and recheck. If the fuse(s) blows again, check for a short in the No. A19 fuse and/or the No. B1 fuse circuits.? |
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3. |
Open wire check (+B AUDIO line):
Open wire check (+B AUDIO line)
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?1. |
Disconnect the following connector.
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Audio unit connector A (24P) | |
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?2. |
Measure the voltage between test points 1 and 2.
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Test condition |
Vehicle OFF (LOCK) mode |
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Audio unit connector A (24P): disconnected |
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Test point 1 |
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Test point 2 |
Body ground | |
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Is there battery voltage?
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YES: With RR CAMERA ACC DIODE circuit |
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The +B AUDIO wire is OK. Go to step 4. |
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YES: Without RR CAMERA ACC DIODE circuit |
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The +B AUDIO wire is OK. Go to step 5. |
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Repair an open in the wire.? |
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4. |
Open wire check (RR CAMERA ACC DIODE/ACC line):
Open wire check (RR CAMERA ACC DIODE/ACC line)
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?1. |
Turn the vehicle to the ON mode. |
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?2. |
Measure the voltage between test points 1 and 2.
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Test condition |
Vehicle ON mode |
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Audio unit connector A (24P): disconnected |
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Test point 1 |
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Test point 2 |
Body ground | |
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Is there battery voltage?
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The RR CAMERA ACC DIODE/ACC wire is OK. Go to step 6. |
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Repair an open in the wire.? |
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5. |
Open wire check (ACC line):
Open wire check (ACC line)
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?1. |
Turn the vehicle to the ON mode. |
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?2. |
Measure the voltage between test points 1 and 2.
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Test condition |
Vehicle ON mode |
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Audio unit connector A (24P): disconnected |
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Test point 1 |
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Test point 2 |
Body ground | |
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Is there battery voltage?
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The ACC wire is OK. Go to step 6. |
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Repair an open in the wire.? |
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6. |
Open wire check (GND line):
Open wire check (GND line)
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?1. |
Turn the vehicle to the OFF (LOCK) mode. |
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?2. |
Reconnect audio unit connector A (24P). |
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?3. |
Turn the vehicle to the ON mode. |
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?4. |
Measure the voltage between test points 1 and 2.
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Test condition |
Vehicle ON mode |
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Test point 1 |
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Test point 2 |
Body ground | |
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Is there less than 0.2 V?
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The GND wire is OK. Go to step 7. |
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Repair an open or high resistance in the wire or poor ground (G504).? |
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7. |
Audio panel check:
Audio panel check
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?2. |
Reconnect all the connectors, and recheck. | |
Does the symptom go away?
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Replace the original audio panel.? |
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