Booming Sound While Driving With Audio Unit On or Off (Part 2)

Audio System Symptom Troubleshooting - Booming sound while driving with audio unit on or off (Part 2)

Booming sound while driving with audio unit on or off (Part 2)

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

2. Connect a voltmeter between audio unit connector C (16P) terminal No. 12 to body ground.

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

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

5. Select PGM-FI SYSTEM with the HDS.

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

7. Select ROCKER ARM OIL CONTROL SOLENOID A ON in the SOLENOID VALVE ACTIVATION with the HDS, and measure the voltage.

Is there about 10 V or more?

YES -

Replace the audio unit:

- With navigation Audio Unit Removal/Installation (With Navigation).�
- Without navigation Audio Unit Removal/Installation (Without Navigation).�

NO -

Go to step 8.

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

9. Disconnect audio unit connector C (16P) and the engine mount control unit 16P connector ('10 model).

10. Jump the SCS line with the HDS.

11. Disconnect PCM connector A (49P).

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

13. Check for continuity between audio unit connector C (16P) terminal No. 12 and body ground.

Is there continuity?

YES -

Go to step 14.

NO -

Repair an open in the wire between the audio unit and the PCM.�

14. Remove the jumper wire.

15. Check for continuity between audio unit connector C (16P) terminal No. 12 and body ground.

Is there continuity?

YES -

Repair a short to body ground in the wire between the audio unit and the PCM.�

NO -

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

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

17. Connect a voltmeter between audio unit connector C (16P) terminal No. 11 and body ground.

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

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

20. Select PGM-FI SYSTEM with the HDS.

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

22. Select ROCKER ARM OIL CONTROL SOLENOID A (B2) COMMAND and RETURN signal ON with the HDS, by pressing the ENTER button, and measure the voltage.

Is there about 10 V or more?

YES -

Replace the audio unit:

- With navigation Audio Unit Removal/Installation (With Navigation).�
- Without navigation Audio Unit Removal/Installation (Without Navigation).�

NO -

Go to step 23.

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

24. Disconnect audio unit connector C (16P) and the engine mount control unit 16P connector ('10 model).

25. Jump the SCS line with the HDS.

26. Disconnect 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 C (16P) terminal No. 11 and body ground.

Is there continuity?

YES -

Go to step 29.

NO -

Repair an open in the wire between the audio unit and the PCM.�

29. Remove the jumper wire.

30. Check for continuity between audio unit connector C (16P) terminal No. 11 and body ground.