Accessories and Optional Equipment: Testing and Inspection
Active Noise Control System TroubleshootingBooming sound while driving
1. Turn the ignition switch ON (II).
2. Operate the audio unit, and check the function of the speakers.
Is booming sound heard from all of the speakers?
YES - Go to step 3.
NO - Go to no sound is heard from speakers.
3. Open the driver's door.
Is the booming sound still present?
YES - Perform electric noise test.
NO - Go to step 4.
4. Turn the audio power switch OFF.
5. Perform the Self-diagnostic Procedure.
6. Press the SCAN button (with navigation) or the "No. 1" button (without navigation).
Is the low-frequency hum heard?
YES - Go to step 7.
NO - Go to step 27.
7. Check that the low-frequency hum continues sounding for about 1 minute.
Does the low-frequency hum continue sounding for about 1 minute?
YES - Go to step 46.
NO - Go to step 8.
8. Check for the No. 32 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES - Go to step 9.
NO - Replace the fuse, and recheck.
9. Turn the ignition switch OFF.
10. Disconnect the active noise control front microphone 5P connector and the active noise control rear microphone 4P connector from active noise control microphone harness.
11. Turn the ignition switch ON (II).
12. Check for voltage between the active noise control front or rear microphone 4P or 5P harness connector No. 4 (front) or No. 1 (rear) terminal and body ground.
Is there battery voltage?
YES - Go to step 13.
NO - Repair an open in the wire between the No. 32 (7.5 A) in the under-dash fuse/relay box and the active noise control front or rear microphone 4P or 5P connector.
13. Check for continuity between the active noise control front or rear microphone 4P or 5P harness connector No. 3 (front) or No. 2 (rear) terminal and body ground.
Is there continuity?
YES - Go to step 14.
NO - Repair an open in the wire between the active noise control front or rear microphone 4P or 5P connector and body ground (G601).
14. Turn the ignition switch OFF.
15. Check for continuity between body ground and the active noise control front or rear microphone 4P or 5P harness connector No. 1 and No. 2 (front) or No. 3 and No. 4 (rear) terminals individually.
Is there continuity?
YES - Repair short in the wire between body ground and the active noise control front or rear microphone 4P or 5P connector.
NO - Go to step 16.
16. Reconnect the active noise control front and rear microphone connectors.
17. Turn the ignition switch ON (II).
18. Check for voltage between body ground and the active noise control front or rear microphone 4P or 5P harness connector No. 1 and No. 2 (front) or No. 3 and No. 4 (rear) terminals individually ,while lightly tapping on the microphones.
Does the voltage change when the microphone is tapped?
YES - Go to step 19.
NO - Replace the active noise control front or rear microphone.
19. Turn the ignition switch OFF.
20. Disconnect the active noise control unit 16P connector.
21. Disconnect the active noise control front microphone 5P connector.
22. Check continuity between the active noise control unit 16P connector No. 3 terminal and the active noise control front microphone 5P harness connector No. 1 terminal.
Is there continuity?
YES - Go to step 23.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 3 terminal and the active noise control front microphone 5P connector No. 1 terminal.
23. Check continuity between the active noise control unit 16P connector No. 11 terminal and the active noise control front microphone 5P harness connector No. 2 terminal.
Is there continuity?
YES - Go to step 24.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 11 terminal and the active noise control front microphone 5P connector No. 2 terminal.
24. Disconnect the active noise control rear microphone 4P connector.
25. Check continuity between the active noise control unit 16P connector No. 4 terminal and the active noise control rear microphone 4P harness connector No. 4 terminal.
Is there continuity?
YES - Go to step 26.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 4 terminal and the active noise control rear microphone 4P connector No. 4 terminal.
26. Check continuity between the active noise control unit 16P connector No. 5 terminal and the active noise control rear microphone 4P harness connector No. 3 terminal.
Is there continuity?
YES - Replace the active noise control unit.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 5 terminal and the active noise control rear microphone 4P connector No. 3 terminal.
27. Check for the No. 32 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES - Go to step 28.
NO - Replace the fuse, and recheck.
28. Disconnect the active noise control unit 16P connector.
29. Check for voltage between the active noise control unit 16P connector No. 8 terminal and body ground.
Is there battery voltage?
YES - Go to step 30.
NO - Repair an open in the wire between the No. 32 (7.5 A) in the under-dash fuse/relay box and the active noise control unit 16P connector No. 8 terminal.
30. Check for continuity between the active noise control unit 16P connector No. 7 terminal and body ground.
Is there continuity?
YES - Go to step 31.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 7 terminal and body ground (G503).
31. Reconnect the active noise control unit 16P connector.
32. Perform the Self-diagnostic Function.
33. Press the SCAN button (with navigation) or the "No. 1" button (without navigation).
34. Check for voltage between the active noise control unit 16P connector No. 12 terminal and body ground.
Is there about 5 V?
YES - Go to step 39.
NO - Go to step 35.
35. Turn the ignition switch OFF.
36. Disconnect the active noise control unit 16P connector and audio unit connector C (5P).
37. Check for continuity between the active noise control unit 16P connector No. 12 terminal and audio unit connector C (5P) No. 5 terminal.
Is there continuity?
YES - Go to step 38.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 12 terminal and the audio unit connector C (5P) No. 5 terminal.
38. Check for continuity between body ground and the active noise control unit 16P connector No. 12 terminal.
Is there continuity?
YES - Repair short to ground in the wire between the active noise control unit 16P connector No. 12 terminal and audio unit connector C (6P) No. 5 terminal.
NO - Replace the audio unit.
39. Perform the Self-diagnostic Procedure.
40. Press and release the SCAN button (with navigation) or the "No. 1" button (without navigation).
41. Check for voltage between the active noise control unit 16P connector No. 2 terminal and body ground.
Is there about 2.5 V?
YES - Replace the audio unit.
NO - Go to step 42.
42. Turn the ignition switch OFF.
43. Disconnect the the active noise control unit 16P connector and audio unit connector C (5P).
44. Check for continuity between the active noise control unit 16P connector and audio unit connector C (5P).
Is there continuity?
YES - Go to step 45.
NO - Repair any open in the wire(s) between the active noise control unit 16P connector and audio unit connector C (5P).
45. Check for continuity between body ground and the active noise control unit 16P connector No. 1,2,9, and 10 terminal individually.
Is there continuity?
YES - Repair any short to ground in the wire between the active noise control unit 16P connector and the audio unit connector C (5P).
NO - Replace the active noise control unit.
46. Start the engine, and let it idle.
47. Perform the Self-diagnostic Procedure.
48. Press the SCAN button (with navigation) or the "No. 1" button (without navigation).
Is the low-frequency hum heard?
YES - Go to step 49.
NO - The system is OK.
49. Turn the ignition switch OFF.
50. Disconnect the active noise control unit 16P connector and PCM connector A (31P).
51. Check for continuity between the active noise control unit 16P connector No. 15 terminal and PCM connector E (31P) No. 23 terminal.
Is there continuity?
YES - Go to step 52.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 15 terminal and the PCM connector E (31P) No. 23 terminal.
52. Check for continuity between the active noise control unit 16P connector No. 15 terminal and body ground.
Is there continuity?
YES - Repair short to ground in the wire between body ground and the active noise control unit 16P connector and PCM connector E (31P) No. 23 terminal.
NO - Faulty the PCM.