Symptom Troubleshooting

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 12 Volt Battery Test.
- Check the connectors for poor connections or loose terminals.
- Eject all the discs before removing the audio 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 unit turns on.

Does the audio unit display and 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. 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 unit. Check that the audio unit connectors are properly connected.

Are they connected properly?

YES -

- Except DX model: Go to step 6.
- DX model: Go to step 9.

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 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 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, and recheck. If the symptom/indication goes away, replace the original audio unit.

NO -

Repair an open or high resistance in the wire between audio unit connector A (24P) terminal No.12 and body ground (G503).

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

10. Measure the voltage between body ground and audio unit connector A (17P) terminals No. 14 and No. 17 individually.





Is there battery voltage on the both terminals?

YES -

Go to step 11.

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 unit.

11. Measure the voltage between audio unit connector A (17P) terminal No. 9 and body ground.





Is there less than 0.2 V?

YES -

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

NO -

Repair an open or high resistance in the wire between audio unit connector A (17P) terminal No. 9 and body ground (G503).