Booming Sound While Driving With Audio Unit
Audio System Symptom Troubleshooting - Booming sound while driving with audio unit
Booming sound while driving with audio unit on or off
NOTE:
- Check for all system's DTCs first with the HDS. If there are any DTCs stored, go to the indicated DTC's troubleshooting.
- 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 check the function of the speakers.
Is a booming sound or a low-frequency hum heard from the speakers?
YES -
Go to step 3.
NO -
Go to symptom troubleshooting No sound is heard from speaker(s).�
- With premium audio system No Sound Is Heard From the Speaker(s) (Display Is Normal) (With Premium Audio).
- Without premium audio system No Sound Is Heard From the Speaker(s) (Display Is Normal) (Without Premium Audio).
3. Turn the audio system off.
4. Make sure all doors, hood, and the trunk are closed.
5. Start the engine, and let it idle.
6. Do the active noise cancellation (ANC) Self-diagnostic Function Audio System Self-Diagnostic Function.
7. Check for test items on tests 1 through 8.
NOTE: Move on to the next test item within 50 seconds, or the self-diagnostic test ends.
Does low-frequency hum sound heard from speakers for more than 5 second for all test items?
YES -
Go to step 8.
NO -
Go to the appropriate step listed.
- If the all tests failed:
With premium audio system, go to step 15.
Without premium audio system, replace the audio unit Audio Unit Removal/Installation (Without Navigation).
- If the 3rd test failed:
With premium audio system, go to step 29.
Without premium audio system, replace the audio unit Audio Unit Removal/Installation (Without Navigation).
- If the 4th test failed,
- With premium audio system, go to step 34.
- Without premium audio system, replace the audio unit Audio Unit Removal/Installation (Without Navigation).
- If the 5th test failed,
- With navigation: Go to step 39.
- Without navigation: Go to step 48.
- If the 6th test failed, go to step 59.
- If the 7th test failed, go to step 70.
- If the 8th test failed, go to step 80.
8. Turn the ignition switch to LOCK (0).
9. Disconnect the HDS from the DLC.
10. Start the engine, and let it idle.
11. Do the active noise cancellation (ANC) Self-diagnostic Function Audio System Self-Diagnostic Function.
12. Do the 10th test by pressing the No. 1 button.
13. Set the parking brake, and hold the engine speed at 2,500 rpm (A/T in P or N, M/T in neutral), and move on to the 11th test by pressing the No. 1 button.
14. Press the No. 1 button several times to turn the ANC on and off.
Do you hear the low-frequency hum sound turn on and off while pressing the No. 1 button?
YES -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the audio unit, the ECM/PCM, and the under dash fuse box. Then, go to step 1 and recheck.
NO -
Replace the audio unit.�
- With premium audio system Audio Unit Removal/Installation (With Navigation).
- Without premium audio system Audio Unit Removal/Installation (Without Navigation).
15. Turn the ignition switch to LOCK (0).
16. Connect a voltmeter between stereo amplifier connector A (24P) terminals No. 11 and No. 22.
NOTE: Use the voltmeter in AC range.
17. Turn the ignition switch to ON (II).
18. Prepare to do the active noise cancellation (ANC) Self-diagnostic Function Audio System Self-Diagnostic Function.
19. Measure the voltage during the 1st test with the display indicating OFF (press the No. 1 button to switch from ON to OFF).
NOTE: Measure voltage within 50 seconds after you started the 1st test.
Is there about 0.5 V?
YES -
Replace the stereo amplifier Service and Repair.�
NO -
Go to step 20.
20. Turn the ignition switch to LOCK (0).
21. Connect a voltmeter between stereo amplifier connector A (24P) terminals No. 12 and No. 23.
NOTE: Use the voltmeter in AC range.
22. Turn the ignition switch to ON (II).
23. Prepare to do the active noise cancellation (ANC) Self-diagnostic Function Audio System Self-Diagnostic Function.
24. Measure the voltage during the 1st test with the display indicating OFF (press the No. 1 button to switch from ON to OFF).
NOTE: Measure voltage within 50 seconds after you started the 1st test, or the self-diagnostic test ends.
Is there about 0.2 V?
YES -
Replace the stereo amplifier Service and Repair.�
NO -
Go to step 25.
25. Turn the ignition switch to LOCK (0).
26. Disconnect audio unit connector C (16P) and stereo amplifier connector A (24P).
27. Check for continuity between audio unit connector C (16P) and stereo amplifier connector A (24P) according to the table.
Is there continuity?
YES -
Go to step 28.
NO -
Repair an open in the wire between audio unit connector C (16P) and stereo amplifier connector A (24P).�
28. Check for continuity between body ground and audio unit connector C (16P) according to the table.
Is there continuity?
YES -
Repair a short to body ground in the wire between audio unit connector C (16P) and stereo amplifier connector A (24P).�
NO -
Replace the audio unit.�
- With premium audio system Audio Unit Removal/Installation (With Navigation).
- Without premium audio system Audio Unit Removal/Installation (Without Navigation).
29. Turn the ignition switch to LOCK (0).
30. Disconnect audio unit connector C (16P) and stereo amplifier connector A (24P).
31. Check for continuity between audio unit connector C (16P) and stereo amplifier connector A (24P) according to the table.
Is there continuity?
YES -
Go to step 32.
NO -
Repair an open in the wire between audio unit connector C (16P) and stereo amplifier connector A (24P).�
32. Check for continuity between body ground and audio unit connector C (16P) terminals No. 9 and No. 10 individually.
Is there continuity?
YES -
Repair a short to body ground in the wire between audio unit connector C (16P) and stereo amplifier connector A (24P).�
NO -
Go to step 33.
33. Check for continuity between audio unit connector C (16P) terminals No. 9 and No. 10.
Is there continuity?
YES -
Repair a short in the wire between audio unit connector C (16P) and stereo amplifier connector A (24P).�
NO -
Replace the audio unit.�
- With navigation Audio Unit Removal/Installation (With Navigation)
- Without navigation Audio Unit Removal/Installation (Without Navigation)
34. Turn the ignition switch to LOCK (0).
35. Disconnect audio unit connector C (16P) and stereo amplifier connector A (24P).
36. Check for continuity between audio unit connector C (16P) and stereo amplifier connector A (24P) according to the table.
Is there continuity?
YES -
Go to step 37.
NO -
Repair an open in the wire between audio unit connector C (16P) and stereo amplifier connector A (24P).�
37. Check for continuity between body ground and audio unit connector C (16P) terminals No. 1 and No. 2 individually.
Is there continuity?
YES -
Repair a short to body ground in the wire between audio unit connector C (16P) and stereo amplifier connector A (24P).�
NO -
Go to step 38.
38. Check for continuity between audio unit connector C (16P) terminals No. 1 and No. 2.
Is there continuity?
YES -
Repair a short in the wire between audio unit connector C (16P) and stereo amplifier connector A (24P).�
NO -
Replace the audio unit.�
- With navigation Audio Unit Removal/Installation (With Navigation)
- Without navigation Audio Unit Removal/Installation (Without Navigation)
39. Turn the ignition switch to LOCK (0).
40. Connect a voltmeter between audio unit connector C (16P) terminal No. 4 and No. 11.
NOTE: Use the voltmeter in AC range.
41. Turn the ignition switch to ACCESSORY (I).
42. Make a loud noise in front of the front HFL-navigation-ANC microphone.
Does the voltage change when making a loud noise in front of the microphone?
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 43.
43. Turn the ignition switch to LOCK (0).
44. Disconnect audio unit connector C (16P) and the front HFL-navigation-ANC microphone 7P connector.
45. Check for continuity between audio unit connector C (16P) terminal No. 4 and the front HFL-navigation-ANC microphone 7P connector terminal No. 4.
Is there continuity?
YES -
Go to step 46.
NO -
There is an open in the wire between audio unit connector C (16P) and the front HFL-navigation-ANC microphone 7P connector. Replace the affected shielded harness.�
46. Check for continuity between audio unit connector C (16P) terminal No. 4 and body ground.
Is there continuity?
YES -
There is a short to body ground in the wire between audio unit connector C (16P) and the front HFL-navigation-ANC microphone 7P connector. Replace the affected shielded harness.�
NO -
Go to step 47.
47. Check for continuity between front HFL-navigation-ANC microphone 7P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Replace the front HFL-navigation-ANC microphone Front HFL-Navigation-ANC Microphone Removal/Installation (With Navigation).�
NO -
Repair an open in the wire between front HFL-navigation-ANC microphone and body ground (G501) Harness Locations.�
48. Turn the ignition switch to LOCK (0).
49. Connect a voltmeter between audio unit connector C (16P) terminals No. 4 and No. 11.
NOTE: Use the voltmeter in AC range.
50. Turn the ignition switch to ACCESSORY (I).
51. Make a loud noise in front of the rear active noise cancellation microphone.
Does the voltage change when making a loud noise in front of the microphone?
YES -
Replace the audio unit Audio Unit Removal/Installation (With Navigation).�
NO -
Go to step 52.
52. Turn the ignition switch to LOCK (0).
53. Disconnect audio unit connector C (16P) and the front active noise cancellation microphone 3P connector.
54. Connect front active noise cancellation microphone 3P connector terminals No. 1 and No. 3 with a jumper wire.
55. Check for continuity between audio unit connector C (16P) terminals No. 4 and No. 11.
Is there continuity?
YES -
Go to step 56.
NO -
There is an open in the wire between audio unit connector C (16P) and the front active noise cancellation microphone 3P connector. Replace the affected shielded harness.�
56. Remove the jumper wire.
57. Check for continuity between audio unit connector C (16P) terminals No. 4 and No. 11.
Is there continuity?
YES -
There is a short in the wire between audio unit connector C (16P) and the front active noise cancellation microphone 3P connector. Replace the affected shielded harness.�
NO -
Go to step 58.
58. Check for continuity between audio unit connector C (16P) terminal No. 4 and body ground.
Is there continuity?
YES -
There is a short to body ground in the wire between audio unit connector C (16P) and the front active noise cancellation microphone 3P connector. Replace the affected shielded harness.�
NO -
Replace the front active noise cancellation microphone Active Noise Cancellation Microphone Removal/Installation.�
59. Turn the ignition switch to LOCK (0).
60. Connect a voltmeter between audio unit connector C (16P) terminals No. 5 and No. 12.
NOTE: Use the voltmeter in AC range.
61. Turn the ignition switch to ACCESSORY (I).
62. Make a loud noise in front of the rear active noise cancellation microphone.
Does the voltage change when making a loud noise in front of the microphone?
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 63.
63. Turn the ignition switch to LOCK (0).
64. Disconnect audio unit connector C (16P) and the rear active noise cancellation microphone 3P connector.
65. Connect rear active noise cancellation microphone 3P connector terminals No. 1 and No. 3 with a jumper wire.
66. Check for continuity between audio unit connector C (16P) terminals No. 5 and No. 12.
Is there continuity?
YES -
Go to step 67.
NO -
There is an open in the wire between audio unit connector C (16P) and the rear active noise cancellation microphone 3P connector. Replace the wire harness or the under-dash fuse/relay box Drivers Under-dash Fuse/Relay Box (Drivers MICU) Removal and Installation (USA Models).�
67. Remove the jumper wire.
68. Check for continuity between audio unit connector C (16P) terminals No. 5 and No. 12.
Is there continuity?
YES -
There is a short in the wire between audio unit connector C (16P) and the rear active noise cancellation microphone 3P connector. Replace the wire harness or the under-dash fuse/relay box Drivers Under-dash Fuse/Relay Box (Drivers MICU) Removal and Installation (USA Models).�
NO -
Go to step 69.
69. Check for continuity between audio unit connector C (16P) terminal No. 5 and body ground.
Is there continuity?
YES -
There is a short to body ground in the wire between audio unit connector C (16P) and the rear active noise cancellation microphone 3P connector. Replace the wire harness or the under-dash fuse/relay box Drivers Under-dash Fuse/Relay Box (Drivers MICU) Removal and Installation (USA Models).�
NO -
Replace the rear active noise cancellation microphone Active Noise Cancellation Microphone Removal/Installation.�
70. Turn the ignition switch to LOCK (0).
71. Start the engine, and let it idle.
72. Measure voltage between audio unit connector C (16P) terminal No. 15 and body ground.
Is there about 5 V (pulses)?
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 73.
73. Turn the ignition switch to LOCK (0).
74. Jump the SCS line with the HDS.
75. Disconnect audio unit connector C (16P) and ECM/PCM connector A (49P).
76. Connect ECM/PCM connector A (49P) terminal No. 29 to body ground with a jumper wire.
77. Check continuity between audio unit connector C (16P) terminal No. 15 and body ground.
Is there continuity?
YES -
Go to step 78.
NO -
Repair an open in the wire between audio unit connector C (16P) and ECM/PCM connector A (49P).�
78. Remove the jumper wire.
79. Check continuity between audio unit connector C (16P) terminal No. 15 and body ground.
Is there continuity?
YES -
Repair a short to body ground in the wire between audio unit connector C (16P) and ECM/PCM connector A (49P).�
NO -
Update the ECM/PCM ECM/PCM Update if it does not have the latest software or substitute a known-good ECM/PCM Service and Repair.�
80. Turn the ignition switch to LOCK (0).
81. Do the MICU input test Drivers and Passengers MICU Input Test.
Is the B-CAN line between the audio unit and the MICU OK?
YES -
Replace the audio unit.�
- With navigation Audio Unit Removal/Installation (With Navigation)
- Without navigation Audio Unit Removal/Installation (Without Navigation)
NO -
Repair an open in the wire between audio unit connector B (20P) and MICU connector P (20P).�