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 PWR knob 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. 5 (20 A) fuse and the No. 32 (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 unit Audio Unit Removal/Installation. Check that the audio unit connectors are properly connected.

NOTE: Eject all the CDs before removing the audio unit and the audio disc changer to prevent damaging the CD player's load mechanism.

Are they connected properly?

YES -

Go to step 6.

NO -

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

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

7. Measure voltage between body ground and audio unit connector A (24P) terminals the 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. 5 (20 A) fuse and the No. 32 (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 while pressing and releasing the audio unit power switch several times.





Is there less than 0.2 V?

YES -

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.�

NO -

Repair an open or high resistance in the wire between audio unit connector A (24P) terminal No. 12 and body ground (G404).�