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

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 12 Volt Battery Test.
- Check the connectors for poor connections or loose terminals.
- Eject all the audio discs before removing the audio-navigation unit to prevent damaging the CD player's load mechanism.

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

2. Press the power button on to see if audio-navigation unit turns on.

Does the audio-navigation unit display and 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. 1 (15 A) fuse and the No. 14 (7.5 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. 1 (15 A) fuse and/or the No. 14 (7.5 A) fuse circuits.

5. Remove the audio-navigation unit. Check that the audio-navigation unit connectors are properly connected.

Are they connected properly?

YES -

Go to step 6.

NO -

Repair poor connection and reconnect the connector(s), 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 on the both terminals?

YES -

Go to step 8.

NO -

Repair an open in the wire(s) between the No. 1 (15 A) fuse and the No. 14 (7.5 A) fuse in 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, 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 (G503).