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) (without navigation)

NOTE:

- Check the vehicle battery condition first Battery Test.
- Check the connectors for poor connections or loose terminals.

1. Turn the ignition switch to ON (II).

2. Press the VOLUME/POWER () knob on to see if the audio unit turns on.

Does the audio display operate properly, and does the audio unit sound normal?

YES -

Intermittent failure, the system is OK at this time.

NO -

Go to step 3.

3. Turn the ignition switch to LOCK (0).

4. Check the No. 17 (20 A) fuse in the under-hood fuse/relay box and the No. 35 (10 A) fuse in the under-dash fuse/relay box.

Are the fuses OK?

YES -

Go to step 5.

NO -

Replace the fuse(s), and recheck. If the fuse(s) blows again, check for a short in the No. 17 (20 A) fuse and/or the No. 35 (10 A) fuse circuits.

5. Remove the audio unit Audio Unit Removal/Installation. Check that the audio unit connectors are properly connected.

Are the connectors properly connected?

YES -

Go to step 6.

NO -

Repair poor connections and reconnect the connectors, and recheck.

6. Turn the ignition switch to ON (II).

7. Measure the voltage between body ground and audio unit connector A (24P) terminals No. 14 and No. 24 individually.





Is there battery voltage?

YES -

Go to step 8.

NO -

If the +B wire does not have voltage, repair an open in the wire between the under-hood fuse/relay box and the audio unit. If the ACC wire does not have voltage, repair an open in the wire between the under-dash fuse/relay box and the audio unit.

8. Measure the voltage between audio unit connector A (24P) terminal No. 12 and body ground.





Is there less than 0.2 V?

YES -

Substitute a known-good audio unit Audio Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original audio unit Audio Unit Removal/Installation.

NO -

Repair an open or high resistance in the wire between audio unit connector A (24P) terminal No. 12 and body ground (G402).