No Sound Is Heard From Speaker(s) (Display Is Normal)

No sound is heard from speaker(s) (display is normal)

NOTE:
- Set the fader and balance positions to the center.
- Before doing symptom troubleshooting, check for power switch will not turn ON troubleshooting.

1. Check that the volume button is not set to min level.

Is it at MIN level?

YES - Raise the volume level, and recheck the function.

NO - Go to step 2.

2. Check the MUTE mode.

Is the MUTE mode set?

YES - Cancel the MUTE mode by depressing the mute button, and recheck the function.

NO - Go to step 3.

3. Check to see if there is a specific speaker that has no sound.

Is there a specific one?

YES - Go to step 4.

NO - Go to step 7.

4. Turn the ignition switch OFF.
5. Check the speaker with no sound for any damage.

Is there any damage?

YES - Substitute the speaker and recheck.

NO - Go to step 6.

6. Remove the speaker(s) with no sound, and disconnect its connector.
7. Check the speaker 2P connector for a loose or poor connection.

Reconnect the speaker 2P connector and recheck the symptom; does it still fail?

YES - Go to step 8.

NO - Operation is normal.

8. Measure the resistance between the No. 1 and No. 2 terminals of the speaker connector.

Is there about 4 ohms?

YES - Go to step 9.

NO - Faulty speaker(s).

9. Reconnect the speaker, and remove the audio unit. Disconnect the audio unit 20P connector.




10. Measure the resistance between given terminals of audio unit 20P connector.

Is there more than 4 ohms?

YES - Go to step 11.

NO - Repair open in the wire between the audio unit and speaker.

11. Disconnect the speaker 2P connector.




12. Check for continuity between body ground and audio unit 20P connector terminals No. 5, 6, 7, 8, 15, 16, 17 and 18 individually and between body ground and audio unit connector C (8P) terminals No. 4 and No. 5 individually.

Is there continuity?

YES - Repair short to ground in the wire between the audio unit and speaker.

NO - Substitute a known-good audio unit and recheck. If the symptom/indication goes away, replace the original audio unit.