Booming Sound While Driving With Audio Unit on or Off (With Premium Audio System)

Audio System Symptom Troubleshooting - Booming sound while driving with audio unit on or off ('08-10 models with premium audio system)

Booming sound while driving with audio unit on or off ('08-10 models with premium audio system)

NOTE:

- Check the vehicle battery condition first Testing and Inspection.
- Check the connectors for poor connections or loose terminals.

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

2. Operate the audio unit, and the speakers function normally.

Is a booming sound or a low-frequency hum heard from speakers?

YES -

Go to step 3.

NO -

Go to no sound is heard from speakers No Sound Is Heard From Speaker(s) (Display Is Normal) (08-10 Models With Premium Audio System).�

3. Open the driver's or passenger's door.

Is the booming sound or a low-frequency hum still present?

YES -

Do the electrical noise test Audio System Sound Quality Diagnosis.�

NO -

Go to step 4.

4. Start the engine.

5. Turn the audio power switch off.

6. Do the ANC test No. 1 in the self-diagnostic mode Audio System Self-diagnostic Function.

Can you hear a low-frequency hum more than 1 second?

YES -

Go to step 7.

NO -

- If a low-frequency hum heard about a second, go to step 8.
- If no sound is heard, go to step 14.

7. Do the ANC test No. 2 in the self-diagnostic mode Audio System Self-diagnostic Function.

Can you hear a low-frequency hum for 1 second or more?

YES -

Go to step 55.

NO -

Go to step 12.

8. Do the ANC test No. 3 in the self-diagnostic mode Audio System Self-diagnostic Function.

Can you hear a low-frequency hum for 1 second or more?

YES -

Go to step 9.

NO -

Go to step 27.

9. Do the ANC test No. 4 in the self-diagnostic mode Audio System Self-diagnostic Function.

Can you hear a low-frequency hum for 1 second or more?

YES -

Go to step 10.

NO -

Go to step 27.

10. Do the ANC test No. 5 in the self-diagnostic mode Audio System Self-diagnostic Function.

Can you hear a low-frequency hum for 1 second or more?

YES -

Go to step 11.

NO -

Go to step 32.

11. Do the ANC test No. 6 in the self-diagnostic mode Audio System Self-diagnostic Function.

Can you hear a low-frequency hum for 1 second or more?

YES -

Go to step 12.

NO -

Go to step 39.

12. Do the ANC test No. 7 in the self-diagnostic mode Audio System Self-diagnostic Function.

Can you hear a low-frequency hum for 1 second or more?

YES -

Go to step 13.

NO -

Go to step 46.

13. Do the ANC test No. 8 in the self-diagnostic mode Audio System Self-diagnostic Function.

Can you hear a low-frequency hum for 1 second or more?

YES -

Go to step 55.

NO -

Go to step 53.

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

15. Check the No. 5 (10 A) fuse in the auxiliary under-hood fuse box.

Is the fuse OK?

YES -

Go to step 16.

NO -

Replace the fuse, and recheck.�

16. Measure the voltage between active noise cancellation unit 20P connector terminal No. 20 and body ground.

Is there battery voltage?

YES -

Go to step 17.

NO -

Repair an open in the wire between the No. 5 (10 A) fuse in the auxiliary under-hood fuse box and active noise cancellation unit 20P connector No. 20 terminal.�

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

18. Measure the voltage between active noise cancellation unit 20P connector terminal No. 8 and body ground.

Is there battery voltage?

YES -

Go to step 19.

NO -

Repair an open in the wire between the audio unit and the active noise cancellation unit.�

19. Measure the voltage between active noise cancellation unit 20P connector terminal No. 10 and body ground.

Is there less than 0.2 V?

YES -

Go to step 20.

NO -

Repair an open or high resistance in the wire between the active noise cancellation unit and body ground (G502).�

20. Do the ANC check mode in the self-diagnostic function Audio System Self-diagnostic Function.

21. Press the No. 1 button.

22. Measure the voltage between active noise cancellation unit 20P connector terminal No. 18 and body ground.

Is there about 5.0 V?

YES -

Replace the active noise cancellation unit.�

NO -

Go to step 23.

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

24. Disconnect the active noise cancellation unit 20P connector and audio unit connector E (5P).

25. Check for continuity between active noise cancellation unit 20P connector terminal No. 18 and body ground.

Is there continuity?

YES -

Repair a short to body ground in the wire between the active noise cancellation unit and the audio unit.�

NO -

Go to step 26.

26. Check for continuity between active noise cancellation unit 20P connector terminal No. 18 and audio unit connector E (5P) terminal No. 5.

Is there continuity?

YES -

Replace the audio unit.�

NO -

Repair an open in the wire between the active noise cancellation unit and audio unit.�

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

28. Disconnect the active noise cancellation unit 20P connector and audio unit connector E (5P).

29. Check for continuity between the active noise cancellation unit 20P connector and body ground according to the table.

Is there continuity?

YES -

There is a short to body ground in the wire(s) between the active noise cancellation unit and the audio unit. Replace the affected shielded harness.�

NO -

Go to step 30.

30. Check for continuity between the terminals of active noise cancellation unit 20P connector according to the table.

Is there continuity between any of the terminals?

YES -

There is a short in the wire(s) between the active noise cancellation unit and the audio unit. Replace the affected shielded harness.�

NO -

Go to step 31.

31. Check for continuity between audio unit connector E (5P) and the active noise cancellation unit 20P connector according to the table.

Is there continuity?

YES -

Substitute a known-good active noise cancellation unit Service and Repair, and recheck. If the symptom/indication goes away, replace the original active noise cancellation unit. If symptom is still present, substitute a known-good audio unit Audio Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original audio unit.�

NO -

There is an open in the wire(s) between the audio unit and the active noise control unit. Replace the affected shielded harness.�

32. Turn the ignition switch to LOCK (0) then turn to ON (II).

33. Measure the voltage between body ground and active noise cancellation unit 20P connector terminal No. 13.

Is there about 8.0 V?

YES -

Go to step 34.

NO -

Replace the active noise cancellation unit Service and Repair.�

34. Measure the voltage between body ground and active noise cancellation front microphone 2P connector terminal No. 2.

Is there about 8.0 V?

YES -

Go to step 35.

NO -

There is an open or a short in the wire between the active noise cancellation front microphone and the active noise cancellation unit. Replace the affected shielded harness.�

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

36. Disconnect the active noise cancellation unit 20P connector.

37. Disconnect the active noise cancellation front microphone 2P connector.

38. Check for continuity between active noise cancellation unit 20P connector terminals No. 4 and No. 13.

Is there continuity?

YES -

There is a short in the wires between the active noise cancellation unit and active noise cancellation front microphone. Replace the affected shielded harness.�

NO -

Substitute a known-good active noise cancellation front microphone Service and Repair, and recheck. If the symptom/indication goes away, replace the original active noise cancellation front microphone. If symptom is still present, substitute a known-good active noise cancellation unit Service and Repair, and recheck. If the symptom/indication goes away, replace the original active noise cancellation unit.�

39. Turn the ignition switch to LOCK (0) then turn to ON (II).

40. Measure the voltage between body ground and active noise cancellation unit 20P connector terminal No. 14.

Is there about 8.0 V?

YES -

Go to step 41.

NO -

Replace the active noise cancellation unit Service and Repair.�

41. Measure the voltage between body ground and active noise cancellation rear microphone 2P connector terminal No. 2.

Is there about 8.0 V?

YES -

Go to step 42.

NO -

There is an open or a short in the wire between the active noise cancellation rear microphone and active noise cancellation unit. Replace the affected shielded harness.�

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

43. Disconnect the active noise cancellation unit 20P connector.

44. Disconnect the active noise cancellation rear microphone 2P connector.

45. Check for continuity between active noise cancellation unit 20P connector terminals No. 5 and No. 14.

Is there continuity?

YES -

There is a short in the wires between the active noise cancellation unit and the active noise cancellation rear microphone. Replace the affected shielded harness.�

NO -

Substitute a known-good active noise cancellation rear microphone Service and Repair, and recheck. If the symptom/indication goes away, replace the original active noise cancellation rear microphone. If symptom is still present, substitute a known-good active noise cancellation unit Service and Repair, and recheck. If the symptom/indication goes away, replace the original active noise cancellation unit.�

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

47. Disconnect the active noise cancellation unit 20P connector.

48. Connect the HDS to the data link connector (DLC) Reading and Clearing Diagnostic Trouble Codes.

49. Jump the SCS line with the HDS.

50. Disconnect PCM connector A (49P).

51. Check for continuity between the active noise cancellation unit 20P connector terminal No. 9 and body ground.

Is there continuity?

YES -

Repair a short to body ground in the wire between the active noise cancellation unit and PCM.�

NO -

Go to step 52.

52. Check for continuity between active noise cancellation unit 20P connector terminal No. 9 and PCM connector A (49P) terminal No. 33.

Is there continuity?

YES -

Substitute a known-good active noise cancellation unit Service and Repair, and recheck. If the symptom/indication goes away, replace the original active noise cancellation unit. If symptom is still present, update the PCM PCM Update if it does not have the latest software or substitute a known-good PCM Service and Repair.�

NO -

Repair an open in the wire between the active noise cancellation unit and the PCM.�

53. Turn the ignition switch to LOCK (0) then turn to ON (II).

54. Measure the voltage between active noise cancellation unit 20P connector terminal No. 15 and body ground while the door is opening.

Is there about 5.0 V?

YES -

Replace the active noise cancellation unit Service and Repair.�

NO -

Repair an open in the wire between the active noise cancellation unit and under-dash fuse/relay box connector W (5P) terminal No. 4.�

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

56. Connect the HDS to the data link connector (DLC) Reading and Clearing Diagnostic Trouble Codes.

57. Do the ANC test mode 9 in the self-diagnostic mode Audio System Self-diagnostic Function.

Can you hear a low-frequency hum for 1 second or more?

YES -

Go to step 58.

NO -

Go to step 59.

58. Do the ANC test mode 10 in the self-diagnostic mode Audio System Self-diagnostic Function.

Can you hear a low-frequency hum for 1 second or more?

YES -

Substitute a known-good active noise cancellation unit Service and Repair, and recheck. If the symptom/indication goes away, replace the original active noise cancellation unit. If symptom is still present, substitute a known-good audio unit Audio Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original audio unit.�

NO -

Go to step 65.

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

60. Disconnect the active noise cancellation unit 20P connector and engine mount control unit 16P connector.

61. Jump the SCS line with the HDS.

62. Disconnect PCM connector A (49P).

63. Check for continuity between body ground and active noise cancellation unit 20P connector terminal No. 6.

Is there continuity?

YES -

Repair a short to body ground in the wire between the active noise cancellation unit and PCM.�

NO -

Go to step 64.

64. Check for continuity between active noise cancellation unit 20P connector terminal No. 6 and PCM connector A (49P) terminal No. 14.

Is there continuity?

YES -

Substitute a known-good active noise cancellation unit Service and Repair, and recheck. If the symptom/indication goes away, replace the original active noise cancellation unit. If symptom is still present, update the PCM PCM Update if it does not have the latest software or substitute a known-good PCM Service and Repair.�

NO -

Repair an open in the wire between the active noise cancellation unit and the PCM.�

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

66. Disconnect the active noise cancellation unit 20P connector and engine mount control unit 16P connector.

67. Jump the SCS line with the HDS.

68. Disconnect PCM connector A (49P).

69. Check for continuity between body ground and active noise cancellation unit 20P connector terminal No. 7.

Is there continuity?

YES -

Repair a short to body ground in the wire between the active noise cancellation unit and PCM.�

NO -

Go to step 70.

70. Check for continuity between active noise cancellation unit 20P connector terminal No. 7 and PCM connector A (49P) terminal No. 15.