NOTE:
1. Problem verification:
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:
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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. B22 (10 A) fuse and/or the No. C37 (7.5 A) fuse circuits.
3. Open wire check (+B AUDIO line):
NOTE: Eject all the discs before disconnecting the audio-navigation unit to prevent damaging the CD player's load mechanism.
Audio-navigation unit connector A (24P)
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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. B22 (10 A) fuse in the under-hood fuse/relay box and the audio-navigation unit.
4. Open wire check (ACC line):
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Is there battery voltage?
YES
The ACC wire is OK. Go to step 5.
NO
Repair an open in the wire between the No. C37 (7.5 A) fuse in the under-dash fuse/relay box and the audio-navigation unit.
5. Open wire check (GND line):
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Is there continuity?
YES
The GND wire is OK. Go to step 6.
NO
Repair an open or high resistance in the wire between the audio-navigation unit and body ground (G404).
6. Audio-navigation unit check (substitution):
Does the symptom go away?
YES
Replace the original audio panel.
NO
Replace the audio-navigation unit.
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