Booming Sound While Driving With Audio Unit On Or Off (Part 2) (With Rear Entertainment System And/Or Navigation)

Audio System Symptom Troubleshooting - Booming sound while driving with audio unit on or off (part 2) (With rear entertainment system and/or navigation)

Booming sound while driving with audio unit on or off (part 2) (With rear entertainment system and/or navigation)

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

2. Do the MICU input test MICU And Door Multiplex Control Unit Input Test.

Is the B-CAN line between the audio unit and the MICU OK?

YES -

Replace the audio unit Audio Unit Removal/Installation.�

NO -

Repair an open in the wire between audio unit connector D (20P) and MICU connector T (34P).�

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

4. Connect a voltmeter between audio unit connector E (16P) terminal No. 13 to body ground.

5. Connect the HDS to the DLC Reading and Clearing Diagnostic Trouble Codes.

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

7. Select PGM-FI SYSTEM with the HDS.

8. Select VTEC TEST in the INSPECTION MENU with the HDS.

9. Select ROCKER ARM OIL CONTROL SOLENOID A (B1) ON in the SOLENOID VALVE ACTIVATION with the HDS, and measure the voltage.

Is the voltage between 5 V and battery voltage?

YES -

Replace the audio unit Audio Unit Removal/Installation.�

NO -

Go to step 10.

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

11. Jump the SCS line with the HDS.

12. Disconnect audio unit connector E (16P) and PCM connector A (49P).

13. Connect PCM connector A (49P) terminal No. 14 to body ground with a jumper wire.

14. Check for continuity between audio unit connector E (16P) terminal No. 13 and body ground.

Is there continuity?

YES -

Go to step 15.

NO -

Repair an open in the wire between audio unit connector E (16P) and PCM connector A (49P).�

15. Remove the jumper wire from PCM connector A (49P).

16. Check for continuity between audio unit connector E (16P) terminal No. 13 and body ground.

Is there continuity?

YES -

Repair a short to body ground in the wire between audio unit connector E (16P) and PCM connector A (49P).�

NO -

Update the PCM PCM Update if it does not have the latest software or substitute a known-good PCM.�

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

18. Connect a voltmeter between audio unit connector E (16P) terminal No. 14 to body ground.

19. Connect the HDS to the DLC Reading and Clearing Diagnostic Trouble Codes.

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

21. Select PGM-FI SYSTEM with the HDS.

22. Select VTEC TEST in the INSPECTION MENU with the HDS.

23. Select ROCKER ARM OIL CONTROL SOLENOID A (B2) ON in the SOLENOID VALVE ACTIVATION with the HDS, and measure the voltage.

Is the voltage about 10 V?

YES -

Replace the audio unit Audio Unit Removal/Installation.�

NO -

Go to step 24.

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

25. Jump the SCS line with the HDS.

26. Disconnect audio unit connector E (16P) and PCM connector A (49P).

27. Connect PCM connector A (49P) terminal No. 15 to body ground with a jumper wire.

28. Check for continuity between audio unit connector E (16P) terminal No. 14 and body ground.

Is there continuity?

YES -

Go to step 29.

NO -

Repair an open in the wire between audio unit connector E (16P) and PCM connector A (49P).�

29. Remove the jumper wire from PCM connector A (49P).

30. Check for continuity between audio unit connector E (16P) terminal No. 14 and body ground.