Booming Sound While Driving With Audio Unit On or Off
Symptom Troubleshooting: Booming sound while driving with audio unit on or off
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.
- 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. No Sound Is Heard From the Speaker(s) (Display Is Normal) (With Premium Audio System)
- Without premium audio. No Sound Is Heard From the Speaker(s) (Display Is Normal) (Without Premium Audio System)
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. Initial Inspection and Diagnostic Overview
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, go to step 15.
Without premium audio, replace the audio unit. Audio Unit Removal/Installation (Without Navigation)
- If the 3rd test failed:
With premium audio, go to step 29.
Without premium audio, replace the audio unit. Audio Unit Removal/Installation (Without Navigation)
- If the 4th test failed,
- With premium audio, go to step 34.
- Without premium audio, replace the audio unit. Audio Unit Removal/Installation (Without Navigation)
- If the 5th test failed, go to step 39.
- 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. Initial Inspection and Diagnostic Overview
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. Audio Unit Removal/Installation (With Navigation)
- Without premium audio. 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. Initial Inspection and Diagnostic Overview
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. Initial Inspection and Diagnostic Overview
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 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 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. Audio Unit Removal/Installation (With Navigation)
- Without premium audio. 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 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 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 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 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 short to body ground in the wire between audio unit connector C (16P) and the 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 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 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 HFL-navigation-ANC microphone 7P connector.
45. Check for continuity between audio unit connector C (16P) terminal No. 4 and the HFL-navigation-ANC microphone 7P connector terminal No. 4.
Is there continuity?
YES - Go to step 46.
NO - Open in the wire between audio unit connector C (16P) and the 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 - Short to body ground in the wire between audio unit connector C (16P) and the HFL-navigation-ANC microphone 7P connector. Replace the affected shielded harness.
NO - Go to step 47.
47. Check for continuity between HFL-navigation-ANC microphone 7P connector terminal No. 1 and body ground.
Is there continuity?
YES - Replace the HFL-navigation-ANC microphone. Service and Repair
NO - Repair open in the wire between HFL-navigation-ANC microphone and body ground (G501).
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 active noise cancellation rear microphone.
Does the voltage change when making a loud noise in front of the microphone?
YES - Replace the audio unit.
NO - Go to step 52.
52. Turn the ignition switch to LOCK (0).
53. Disconnect audio unit connector C (16P) and the active noise cancellation front microphone 3P connector.
54. Connect active noise cancellation front 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 - Open in the wire between audio unit connector C (16P) and the active noise cancellation front 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 - Short in the wire between audio unit connector C (16P) and the active noise cancellation front 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 - Short to body ground in the wire between audio unit connector C (16P) and the active noise cancellation front microphone 3P connector. Replace the affected shielded harness.
NO - Replace the active noise cancellation front microphone. Service and Repair
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 active noise cancellation rear 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 active noise cancellation rear microphone 3P connector.
65. Connect active noise cancellation rear 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 - Open in the wire between audio unit connector C (16P) and the active noise cancellation rear microphone 3P connector. Replace the wire harness or the under-dash fuse/relay box. Drivers Under-Dash Fuse/Relay Box (MICU) Removal/Installation
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 - Short in the wire between audio unit connector C (16P) and the active noise cancellation rear microphone 3P connector. Replace the wire harness or the under-dash fuse/relay box. Drivers Under-Dash Fuse/Relay Box (MICU) Removal/Installation
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 - Short to body ground in the wire between audio unit connector C (16P) and the active noise cancellation rear microphone 3P connector. Replace the wire harness or the under-dash fuse/relay box. Drivers Under-Dash Fuse/Relay Box (MICU) Removal/Installation
NO - Replace the active noise cancellation rear microphone. Service and Repair
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 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 short to body ground in the wire between audio unit connector C (16P) and ECM/PCM connector A (49P).
NO - Update the ECM/PCM if it does not have the latest software ECM/PCM Updateor substitute a known-good ECM/PCM. Service and Repair
80. Turn the ignition switch to LOCK (0).
81. Do the MICU input test. Multiplex Integrated Control System 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 open in the wire between audio unit connector B (20P) and MICU connector P (20P).