Symptom Troubleshooting

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 audio unit turns ON.

Does the power turn ON?
YES - Operation is normal. If the display turns ON, but no sound is heard or if the display does not turn ON, but the sound is OK. Go to audio system sound is weak or distorted [1][2]Audio System Sound Is Weak Or Distorted (Display Is Normal), or no sound is heard from the speaker(s). Symptom Troubleshooting

NO - Go to step 3.


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

4. Check the No. 22 (15 A) fuse and the No. 9 (10 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. Service and Repair Check that the audio unit connector is properly connected.

Is it connected properly?
YES - Go to step 6.

NO - Reconnect the connector, and recheck the function.


6. Disconnect the audio unit 20P connector.
NOTE: Eject the disc before removing the audio unit 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 20P connector 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. 22 (15 A) fuse and the No. 9 (10 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 20P connector.

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

12. Measure the voltage between audio unit 20P connector terminal No. 20 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. Service and Repair

NO - Repair open in the wire between the audio unit connector A (20P) terminal No. 20 and body ground (G502).