Audio Unit Power Switch Will Not Turn on (No Information Display and No Sound)

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)

NOTE:

- Check the vehicle battery condition first Testing and Inspection.
- Check the connectors for poor connections or loose terminals.

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

2. Push the power switch ON to see if 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).

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.�

5. Remove the audio unit with navigation Audio Unit Removal/Installation (With Navigation), without navigation Audio Unit Removal/Installation (Without Navigation). Check that the audio unit connectors are properly connected.

Are they connected properly?

YES -

Go to step 6.

NO -

Repair poor connections and reconnect the connectors, and recheck the function.�

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?

YES -

Go to step 8.

NO -

Repair an open in the wire(s) between the No. 15 (10 A) fuse in the under-hood fuse/relay box, the No. 18 (7.5 A) fuse in the driver's 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 -

Replace the audio unit.�

- With navigation Audio Unit Removal/Installation (With Navigation)
- Without navigation Audio Unit Removal/Installation (Without Navigation)

NO -

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