Audio Unit Power Switch Will Not Turn On (No Information Display And No Sound) (Without Navigation)

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.

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

2. Push the VOLUME/POWER knob on to see if the audio unit turns on.

Does the audio unit 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), or press the engine start/stop button to select the OFF mode.

4. Check the No. 15 (10 A) fuse in the under-hood fuse/relay box and the No. 18 (7.5 A) fuse in the driver's 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. 15 (10 A) fuse and/or the No. 18 (7.5 A) fuse circuit(s).

5. Check for poor connections or loose terminals at the audio unit.

Are there connections or terminals OK?

YES -

Go to step 6.

NO -

Repair poor connections or loose terminals, and recheck.

6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

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 No. 15 (10 A) fuse in 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 No. 18 (7.5 A) fuse in the driver's under-dash fuse/relay box and the audio unit.

8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

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





Is there less than 0.2 V?

YES -

Go to step 10.

NO -

Repair an open or high resistance in the wire between the audio unit and body ground (G502) Audio Wire Harness.

10. Measure the voltage between body ground and audio and HVAC switch panel connector A (20P) terminals No. 1 and No. 20 individually.





Is there battery voltage?

YES -

Go to step 11.

NO -

If the +B wire does not have voltage, repair an open in the wire between the No. 15 (10 A) fuse in the under-hood fuse/relay box and the audio and HVAC switch panel. If the ACC wire does not have voltage, repair an open in the wire between the No. 18 (7.5 A) fuse in the driver's under-dash fuse/relay box and the audio and HVAC switch panel.

11. Measure the voltage between audio and HVAC switch panel connector A (20P) terminal No. 3 and body ground.





Is there less than 0.2 V?

YES -

Go to step 12.

NO -

Repair an open or high resistance in the wire between the audio and HVAC switch panel and body ground (G501) Audio Wire Harness.

12. Measure the voltage between audio and HVAC switch panel connector A (20P) terminal No. 5 and body ground.





Is there battery voltage?

YES -

Go to step 13.

NO -

Repair an open or a short in the wire between the audio and HVAC switch panel and the audio unit.

13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

14. Disconnect audio unit connector F (12P) and audio and HVAC switch panel connector A (20P).

15. Check for continuity between audio and HVAC switch panel connector A (20P) terminal No. 17 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between the audio and HVAC switch panel and the audio unit.

NO -

Go to step 16.

16. Check for continuity between audio unit connector F (12P) terminal No. 12 and audio and HVAC switch panel connector A (20P) terminal No. 17.





Is there continuity?

YES -

Go to step 17.

NO -

Repair an open in the wire between the audio and HVAC switch panel and the audio unit.

17. Reconnect audio and HVAC switch panel connector A (20P).

18. Check for continuity between audio and HVAC switch panel connector A (20P) terminal No. 17 and body ground.





Is there continuity?

YES -

Replace the audio and HVAC switch panel Audio and HVAC Switch Panel Removal/Installation.

NO -

Go to step 19.

19. While press and holding the VOLUME/POWER knob, check for continuity between audio and HVAC switch panel connector A (20P) terminal No. 17 and body ground.





Is there continuity?

YES -

Go to step 20.

NO -

Replace the audio and HVAC switch panel Audio and HVAC Switch Panel Removal/Installation.

20. Reconnect audio unit connector F (12P).

21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

22. While repeating ON and OFF of the VOLUME/POWER knob, measure the voltage between audio and HVAC switch panel connector A (20P) terminal No. 19 and body ground.





Does the voltage change from 0 V to 12 V?

YES -

Replace the audio and HVAC switch panel Audio and HVAC Switch Panel Removal/Installation.

NO -

Repair an open in the wire between audio unit connector B (24P) terminal No. 21 and audio and HVAC switch panel connector A (20P) terminal No. 19. If the wire and the pin fits are OK, 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.