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

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. 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, and recheck.


5. Remove the audio unit. Audio Unit Removal/Installation Check that the audio unit connectors are properly connected.

Are they connected properly?
YES - Go to step 6.

NO - Repair poor connection and reconnect the connector, and recheck the function.


6. Disconnect audio unit connector A (24P).

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

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

8. Measure voltage between body ground and audio unit connector A (24P) terminals the No. 14 and No. 24 individually.

Is there battery voltage?
YES - Go to step 9.

NO - Repair 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.






9. Turn the ignition switch to LOCK (0).

10. Reconnect the audio unit connector A (24P).

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

12. Measure the voltage between audio unit connector A (20P) terminal No. 12 and body ground while pressing and releasing the audio unit power switch several times.

Is there less than 0.1 V?
YES - Replace the audio unit. Audio Unit Removal/Installation

NO - Repair open in the wire between audio unit connector A (24P) terminal No 12 and body ground (G404).