Voice Activation System: Testing and Inspection
Active Noise Control System TroubleshootingBooming sound while driving
NOTE: Always check the connectors for poor connections or loose terminals.
1. Turn the ignition switch ON (II).
2. Operate the audio unit, and check the function of the speakers.
Is a booming sound heard from 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 the electrical noise test.
NO - Go to step 4.
4. Turn the audio power switch OFF.
5. Perform 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 28.
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 47.
NO - Go to step 8.
8. Check for the No. 32 (10 A) and the No. 5 (7.5 A) ('06 model) fuses 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. Turn the ignition switch OFF.
10. Disconnect active noise control front microphone connector B (3P) and active noise control rear microphone connector B (3P).
11. Turn the ignition switch ON (II).
12. Check for voltage between active noise control front and rear microphone connector B (3P) terminal No. 3 and body ground.
Is there battery voltage?
YES - Go to step 13.
NO - Repair open in the wire between the No. 32 (10 A) in the driver's under-dash fuse/relay box and active noise control front or rear microphone connector B (3P).
13. Check for continuity between active noise control front and rear microphone connector B (3P) terminal No. 1 and body ground.
Is there continuity?
YES - Go to step 14.
NO - Repair an open in the wire between active noise control front or rear microphone connector B (3P) No. 1 terminal and body ground (G652).
14. Turn the ignition switch OFF.
15. Disconnect active noise control front microphone connector A (2P) and active noise control rear microphone connector A (2P).
16. Check for continuity between body ground and active noise control front and rear microphone connector A (2P) No. 1 and No. 2 terminals individually.
Is there continuity?
YES - Repair a short in the wire between body ground and active noise control front or rear microphone connector A (2P) terminals No. 1 and No. 2.
NO - Go to step 17.
17. Reconnect the active noise control front and rear microphone connectors.
18. Turn the ignition switch ON (II).
19. Check for voltage between the body ground and active noise control front rear microphone connector A (2P) terminals No. 1 and No. 2 individually while lightly tapping the microphones.
Does the voltage change a lot?
YES - Go to step 20.
NO - Replace the active noise control front or rear microphone.
20. Turn the ignition switch OFF.
21. Disconnect the active noise control unit 16P connector.
22. Disconnect active noise control front microphone connector A (3P).
23. Check for continuity between the active noise control unit 16P connector No. 3 terminal and active noise control front microphone connector A (2P) terminal No. 2.
Is there continuity?
YES - Go to step 24.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 3 terminal and active noise control front microphone connector A (2P) No. 2 terminal.
24. Check for continuity between the active noise control unit 16P connector No. 11 terminal and active noise control front microphone connector A (2P) terminal No. 1.
Is there continuity?
YES - Go to step 25.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 11 terminal and active noise control front microphone connector A (2P) terminal No. 1.
25. Disconnect active noise control rear microphone connector A (2P).
26. Check for continuity between the active noise control unit 16P connector No. 4 terminal and active noise control rear microphone connector A (2P) terminal No. 2.
Is there continuity?
YES - Go to step 27.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 4 terminal and active noise control front microphone connector A (2P) terminal No. 2.
27. Check for continuity between the active noise control unit 16P connector No. 5 terminal and active noise control rear microphone connector A (2P) terminal No. 1.
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 active noise control rear microphone connector A (2P) terminal No. 1.
28. Check for the No. 32 (10 A) and the No. 5 (7.5 A) ('06 model) fuses in the driver's under-dash fuse/relay box.
Are the fuses OK?
YES - Go to step 29.
NO - Replace the fuse, and recheck.
29. Disconnect the active noise control unit 16P connector.
30. 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 31.
NO - Repair an open in the wire between the No. 32 (10 A) fuse ('05 model) or No. 5 (7.5 A) fuse (06 model) in the driver's under-dash fuse/relay box and the active noise control unit 16P connector terminal No. 8.
31. Check for continuity between the active noise control unit 16P connector No. 7 terminal and body ground.
Is there continuity?
YES - Go to step 32.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 7 terminal and body ground (G652).
32. Reconnect the active noise control unit 16P connector.
33. Perform the self-diagnostic function.
34. Press the "No. 1" button.
35. 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 40.
NO - Go to step 36.
36. Turn the ignition switch OFF.
37. Disconnect the active noise control unit 16 connector and stereo amplifier connector A (26P).
38. Check for continuity between the active noise control unit 16P connector No. 12 terminal and stereo amplifier connector A (26P) terminal No. 18.
Is there continuity?
YES - Go to step 39.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 12 terminal and stereo amplifier connector A (26P) terminal No. 18.
39. Check for continuity between body ground and the active noise control unit 16P connector terminal No. 12.
Is there continuity?
YES - Repair a short in the wire between the active noise control unit 16P connector No. 12 terminal and stereo amplifier connector A (26P) terminal No. 18.1
NO - Replace the stereo amplifier.
40. Perform the self-diagnostic function.
41. Press and release the "No. 1" button.
42. 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 stereo amplifier.
NO - Go to step 43.
43. Turn the ignition switch OFF.
44. Disconnect the active noise control unit 16 connector and stereo amplifier connector C (23P).
45. Check for continuity between the active noise control unit 16P connector and stereo amplifier connector C (23P).
Is there continuity?
YES - Go to step 46.
NO - Repair any open in the wire(s) between the active noise control unit 16P connector and audio unit connector C (14P).
46. Check for continuity between body ground and active noise control unit 16P connector terminals No. 1, 2, 9, and 10 individually.
Is there continuity?
YES - Repair any short in the wire(s) between the active noise control unit 16P connector and audio unit connector C (14P).
NO - Replace the active noise control unit.
47. Start the engine, and let the vehicle idle.
48. Perform the self-diagnostic function.
49. Press the "No. 1" button.
Is the low-frequency hum sound heard?
YES - Go to step 50.
NO - The system is OK.
50. Turn the ignition switch OFF.
51. Disconnect the active noise control unit 16P connector and PCM connector A (31P).
52. Check for continuity between the active noise control unit 16P connector No. 15 terminal and PCM connector A (31P) terminal No. 23.
Is there continuity?
YES - Go to step 53.
NO - Repair an open in the wire between the active noise control unit 16P connector No. 15 terminal and PCM connector A (31P) terminal No. 23.
53. Check for continuity between the active noise control unit 16P connector No. 15 terminal and body ground.
Is there continuity?
YES - Repair a short in the wire between body ground and the active noise control unit 16P connector No. 15 terminal and PCM connector A (31P) terminal No. 23.
NO - Replace the PCM.