Audio-Navigation Unit power Switch Will Not Turn On (No Information Display And No Sound)

Audio System Symptom Troubleshooting - Audio-Navigation unit power switch will not turn on (No information display and no sound)

Audio-Navigation unit power switch will not turn on (No information display and no sound) (with 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 system turns on.

Does the audio display operate properly, and does the audio-navigation 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-navigation unit Audio-Navigation Unit Removal/Installation. Check that the audio-navigation 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-navigation 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-navigation 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-navigation unit.

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





Is there less than 0.2 V?

YES -

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

NO -

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