Audio System Symptom Troubleshooting - Audio unit will not turn on (No information display and no sound)
Audio unit will not turn on (No information display and no sound)
NOTE:
Check the vehicle 12 volt battery condition first.
Check if the Day/Night (enu_1740914_1.0) button has been pressed, and turned off the display (see the Owner's Manual for more information).
Check the connectors for poor connections or loose terminals.
ACC RR CAMERA*1 circuit is for USA and Canada models with keyless access system.
1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Check if the audio unit display indicates any information.

Is any information displayed?

     
YES
     
     
     
Intermittent failure, the system is OK at this time.?
     
NO
     
     
     
The failure is duplicated, go to step 2.
2.
Fuse check:

Fuse check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check the following fuses.
Fuse
No. B21
Fuse
No. C37

Are the fuses OK?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Replace the fuse(s), and recheck. If the fuse(s) blows again, check for a short in the No. B21 fuse and/or the No. C37 fuse circuits.?
3.
Open wire check (+B BACKUP MAIN line):

Open wire check (+B BACKUP MAIN line)
?1.
Disconnect the following connector.
Audio unit connector A (24P)

?2.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio unit connector A (24P): disconnected
Test point 1
Audio unit connector A (24P) No. 3
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The +B BACKUP MAIN wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the wire.?
4.
Open wire check (ACC RR CAMERA*1/ACC line):

Open wire check (ACC RR CAMERA*1/ACC line)
?1.
Turn the vehicle to the ON mode.

?2.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Audio unit connector A (24P): disconnected
Test point 1
Audio unit connector A (24P) No. 23
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The ACC RR CAMERA*1/ACC wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open in the wire.?
5.
Open wire check (GND line):

Open wire check (GND line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Reconnect audio unit connector A (24P).

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Test point 1
Audio unit connector A (24P) No. 1
Test point 2
Body ground

Is there less than 0.2 V?

     
YES
     
     
     
The GND wire is OK. Go to step 6.
     
NO
     
     
     
Repair an open or high resistance in the wire or poor ground (G404).?
6.
Audio panel check:

Audio panel check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Substitute a known-good audio panel. and recheck.

Does the symptom go away?

     
YES
     
     
     
Replace the original audio panel.?
     
NO