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.
- Check the connectors for poor connections or loose terminals.

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

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

Does the audio-navigation unit 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. B1 (15 A) fuse and the No. B14 (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.

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

NOTE:

- Eject all the audio discs before removing the audio-navigation unit to prevent damaging the CD player's load mechanism.
- Remove the PC card before removing the audio-navigation unit.

Is it connected properly?

YES -

Go to step 6.

NO -

Repair poor connections and reconnect the connector(s), and recheck the function.

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

7. Measure the voltage between body ground and audio-navigation unit connector A (24P) terminals No. 3 and No. 24 individually, and between audio-navigation unit connector C (8P) terminal No. 4 and body ground.









Is there battery voltage on the these terminals?

YES -

Go to step 8.

NO -

Repair an open in the wire(s) between the No. B1 (15 A) fuse and/or the No. B14 (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. 1 and body ground, and between audio-navigation unit connector C (8P) terminal No. 1 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 the audio-navigation unit connector A (24P) terminal No. 1 or audio-navigation unit connector C (8P) terminal No. 1 and body ground (G503).