Booming Sound While Driving With Audio Unit on or Off

Audio System Symptom Troubleshooting - Booming sound while driving with audio unit on or off

Booming sound while driving with audio unit on or off

NOTE:

- Check the vehicle battery condition first Battery Test.
- Check the connectors for poor connections or loose terminals.

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

2. Operate the audio unit, and check the function of the speakers.

Is a booming sound heard from the speakers?

YES -

Go to step 3.

NO -

Go to No sound is heard from speaker(s) troubleshooting No Sound Is Heard From the Speaker(s) (Display Is Normal).

3. Open the driver's door, with the booming sound present.

Is the booming sound still present?

YES -

Do the Electrical Noise Test.

NO -

Go to step 4.

4. Turn the audio power switch to off.

5. Do the ANC/Active Sound Control system check mode in the self-diagnostic function.

6. Press the No. 1 button.

Is the low-frequency hum sound heard?

YES -

Go to step 7.

NO -

Go to step 25.

7. Check that the low-frequency hum sound continues sounding for about 1 minute.

Does the low-frequency hum sound continue sounding for about 1 minute?

YES -

Go to step 44.

NO -

Go to step 8.

8. Check the No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 9.

NO -

Replace the fuse, and recheck.

9. Measure the voltage between ANC/active sound control front and rear microphone connector B (3P) terminal No. 3 and body ground.





Is there battery voltage?

YES -

Go to step 10.

NO -

Repair an open in the wire between the No. 32 (10 A) fuse in the driver's under-dash fuse/relay box and ANC/active sound control front or rear microphone connector B (3P).

10. Measure the voltage between ANC/active sound control front and rear microphone connector B (3P) terminal No. 1 and body ground.





Is there less than 0.2 V?

YES -

Go to step 11.

NO -

Repair an open in the wire between ANC/active sound control front or rear microphone connector B (3P) terminal No. 1 and body ground (G652).

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

12. Disconnect ANC/active sound control front microphone connector A (2P) and ANC/active sound control rear microphone connector A (2P), ANC/active sound control unit 16P connector, and stereo amplifier connector C (23P).

13. Check for continuity between body ground and ANC/active sound control front and rear microphone connector A (2P) terminals No. 1 and No. 2 individually.

FRONT





REAR





Is there continuity?

YES -

Repair a short in the wire between body ground and the ANC/active sound control front or rear microphone.

NO -

Go to step 14.

14. Reconnect the ANC/active sound control front and rear microphone control unit, and the stereo amplifier connectors.

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

16. Measure the voltage between body ground and ANC/active sound control front or rear microphone connector A (2P) terminals No. 1 and No. 2 individually while lightly tapping the microphones.

FRONT





REAR





Does the voltage fluctuate when you tap the microphones?

YES -

Go to step 17.

NO -

Replace the ANC/active sound control front or rear microphone.

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

18. Disconnect the ANC/active sound control unit 16P connector.

19. Disconnect ANC/active sound control front microphone connector A (2P).

20. Check for continuity between ANC/active sound control unit 16P connector terminal No. 3 and ANC/active sound control front microphone connector A (2P) terminal No. 2.





Is there continuity?

YES -

Go to step 21.

NO -

Repair an open in the wire between the ANC/active sound control unit and the ANC/active sound control front microphone.

21. Check for continuity between ANC/active sound control unit 16P connector terminal No. 11 and ANC/active sound control front microphone connector A (2P) terminal No. 1.





Is there continuity?

YES -

Go to step 22.

NO -

Repair an open in the wire between the ANC/active sound control unit and the ANC/active sound control front microphone.

22. Disconnect ANC/active sound control rear microphone connector A (2P) and stereo amplifier connector C (23P).

23. Check for continuity between ANC/active sound control unit 16P connector terminal No. 4 and ANC/active sound control rear microphone connector A (2P) terminal No. 2.





Is there continuity?

YES -

Go to step 24.

NO -

Repair an open in the wire between the ANC/active sound control unit and the ANC/active sound control front microphone.

24. Check for continuity between ANC/active sound control unit 16P connector terminal No. 5 and ANC/active sound control rear microphone connector A (2P) terminal No. 1.





Is there continuity?

YES -

Replace the ANC/active sound control unit Service and Repair.

NO -

Repair an open in the wire between the ANC/active sound control unit and the ANC/active sound control rear microphone.

25. Check the No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 26.

NO -

Replace the fuse, and recheck.

26. Measure the voltage between ANC/active sound control unit 16P connector terminal No. 8 and body ground.





Is there battery voltage?

YES -

Go to step 27.

NO -

Repair an open in the wire between the No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box and ANC/active sound control unit 16P connector terminal No. 8.

27. Measure the voltage between ANC/active sound control unit 16P connector terminal No. 7 and body ground.





Is there less than 0.2 V?

YES -

Go to step 28.

NO -

Repair an open in the wire between ANC/active sound control unit 16P connector terminal No. 7 and body ground (G652).

28. Do the ANC/Active Sound Control system check mode in the self-diagnostic function.

29. Press the No. 1 button.

30. Disconnect the ANC/active sound control unit 16P connector.

31. Measure the voltage between ANC/active sound control unit 16P connector terminal No. 12 and body ground.





Is there about 5 V?

YES -

Go to step 36.

NO -

Go to step 32.

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

33. Disconnect stereo amplifier connector A (26P).

34. Check for continuity between ANC/active sound control unit 16P connector terminal No. 12 and stereo amplifier connector A (26P) terminal No. 18.





Is there continuity?

YES -

Go to step 35.

NO -

Repair an open in the wire between the ANC/active sound control unit and the stereo amplifier.

35. Check for continuity between body ground and ANC/active sound control unit 16P connector terminal No. 12.





Is there continuity?

YES -

Repair a short in the wire between the ANC/active sound control unit and the stereo amplifier.

NO -

Replace the stereo amplifier Service and Repair.

36. Reconnect the ANC/active sound control unit (16P) connector.

37. Do the ANC/Active Sound Control system check mode self-diagnostic function.

38. Press and release the No. 1 button.

39. Measure the voltage between ANC/active sound control unit 16P connector terminal No. 2 and body ground.





Is there about 2.5 V?

YES -

Replace the stereo amplifier Service and Repair.

NO -

Go to step 40.

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

41. Disconnect the ANC/active sound control unit 16P connector and stereo amplifier connector C (23P).

42. Check for continuity between the ANC/active sound control unit 16P connector and stereo amplifier connector C (23P) according to the table.









Is there continuity?

YES -

Go to step 43.

NO -

Repair an open in the wire(s) between the ANC/active sound control unit and the stereo amplifier.

43. Check for continuity between body ground and ANC/active sound control unit 16P connector terminals No. 1, 2, 9, and 10 individually.





Is there continuity?

YES -

Repair a short in the wire(s) between the ANC/active sound control unit and the stereo amplifier.

NO -

Replace the ANC/active sound control unit Service and Repair.

44. Start the engine, and let the vehicle idle.

45. Do the ANC/Active Sound Control system check mode self-diagnostic function.

46. Press the No. 1 button.

Can you hear the low-frequency hum?

YES -

Go to step 47.

NO -

The system is OK.

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

48. Jump the SCS line with the HDS.

49. Disconnect the ANC/active sound control unit 16P connector and PCM connector A (49P).

50. Check for continuity between ANC/active sound control unit 16P connector terminal No. 15 and PCM connector A (49P) terminal No. 33.





Is there continuity?

YES -

Go to step 51.

NO -

Repair an open in the wire between the ANC/active sound control unit and the PCM.

51. Check for continuity between ANC/active sound control unit 16P connector terminal No. 15 and body ground.





Is there continuity?

YES -

Repair a short in the wire between body ground and the ANC/active sound control unit and the PCM.

NO -

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