Audio System Symptom Troubleshooting - Audio unit power switch will not turn on (No audio information display and no sound)
Audio unit power switch will not turn on (No audio information display and no sound)
NOTE:
Check the vehicle 12 volt battery condition first.
Check the connectors for poor connections or loose terminals.
1.
Problem verification:

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

?2.
Press the POWER button on to see if the audio unit turns on.

Does the audio system operate properly, and does the audio sound normal?

     
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. B19 (7.5 A)
Location
Under-dash fuse/relay box

Fuse
No. B25 (10 A)
Location
Under-dash fuse/relay box

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 B19 (7.5 A) fuse and/or the B25 (10 A) fuse circuits.?
3.
Open wire check (+B AUDIO line):

Open wire check (+B AUDIO line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
   
Test point 1
Audio unit connector A (24P) No. 3
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The +B AUDIO wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the wire between the No. B25 (10 A) fuse in the under-dash fuse/relay box and the audio unit.?
4.
Open wire check (ACC line):

Open wire check (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
   
Test point 1
Audio unit connector A (24P) No. 24
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The ACC wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open in the wire between the No. B19 (7.5 A) fuse in the under-dash fuse/relay box and the audio unit.?
5.
Open wire check (GND line):

Open wire check (GND line)
?1.
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
     
     
     
     
NO
     
     
     
Repair an open in the wire between the audio unit and body ground (G503).?