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.

- 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 the 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 (7.5 A) fuse and the No. 32 (10 A) fuse in the driver's 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 is properly connected.

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

NO - Repair poor connections and reconnect the connectors, and recheck the function.


6. Disconnect audio unit connector A (20P).
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 the voltage between body ground and audio unit connector A (20P) terminals No. 2 and No. 10 individually.

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

NO - Repair open in the wire(s) between the No. 5 (7.5 A) fuse and the No. 32 (10 A) fuse in the driver's under-dash fuse/relay box and the audio unit.






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

10. Reconnect audio unit connector A (20P).

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

12. Measure the voltage between audio unit connector A (20P) terminal No. 20 and body ground.

Is there less than 0.1 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 open in the wire between audio unit connector A (20P) terminal No 20 and body ground (G504).