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 Battery Test.
- Check the connectors for poor connections or loose terminals.
- Eject all CDs before disconnecting the audio unit and CD changer to prevent damaging the CD player's load mechanism.

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

2. Push the PWR knob on to see if the audio system 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(s), and recheck.

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

Are they connected properly connected?

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 (20P) terminals No. 2 and No. 10 individually.





Is there battery voltage?

YES -

Go to step 8.

NO -

Repair an 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.

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





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 in the wire between audio unit connector A (20P) terminal No. 20 and body ground (G504).