Audio Unit Power Switch Will Not Turn On (No Information Display And No Sound)
Audio System Symptom Troubleshooting - Audio unit power switch will not turn on (No information display and no sound)
Audio unit power switch will not turn on (No information display and no sound)
NOTE:
* Check the vehicle battery condition first Battery Test.
* Check the connectors for poor connections or loose terminals.
1. Problem verification:
Problem verification
-1. Turn the ignition switch to ON (II).
-2. Press the POWER button on to see if 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 ignition switch to LOCK (0).
-2. Check the following fuses.
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. A29 (10 A) fuse and/or the No. B19 (7.5 A) fuse circuits.
3. Open wire check (+B_BACK_UP line, ACC line):
Open wire check (+B_BACK_UP line, ACC line)
-1. Turn the ignition switch to ON (II).
-2. Measure the voltage between test points 1 and 2.
Is there battery voltage?
-YES- Go to step 4.
-NO- Repair an open in the wire(s) between the No. A29 (10 A) fuse in the under-hood fuse/relay box and/or the No. B19 (7.5 A) fuse in the under-dash fuse/relay box and the audio unit.
4. Open wire check (GND line):
Open wire check (GND line)
-1. Measure the voltage between test points 1 and 2.
Is there less than 0.2 V?
-YES- Go to step 5.
-NO- Repair an open or high resistance in the wire between the audio unit and body ground (G505).
5. Audio unit check:
Audio unit check
-1. Turn the ignition switch to LOCK (0).
-2. Substitute a known-good audio switch panel Audio Unit Removal and Installation, and recheck.
Does the symptom go away?
-YES- Replace the original audio switch panel.
-NO- Replace the audio unit Audio Unit Removal and Installation.