Acura RL. Instruction — page 200

5. Perform the self-diagnostic function (see 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 29.

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 51.

NO — Go to step 8.

8. Check for the No. 32 (10A) and the No. 5 (7.5A) (’06-07 models) 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 to LOCK (0).

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. Measure the voltage between active noise control front and rear microphone connector B (3P) No. 3

terminal and body ground.

Fig. 80: Measuring Voltage Between No. 3 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

2007 Acura RL

2005-08 ACCESSORIES AND EQUIPMENT Audio System — RL

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YES — Go to step 13.

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

13. Reconnect active noise control front microphone connector B (3P) and active noise control rear

microphone connector B (3P).

14. Measure the voltage between active noise control front and rear microphone connector B (3P) No. 1

terminal and body ground.

Fig. 81: Measuring Voltage Between No. 1 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.1 V?

YES — Go to step 15.

NO — Repair open in the wire between active noise control front or rear microphone connector B (3P)
No. 1 terminal and body ground (G652).

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

16. Disconnect active noise control front microphone connector A (2P) and active noise control rear

microphone connector A (2P), active noise control unit connector (16P), and stereo amplifier
connector C (23P).

17. Check for continuity between body ground and active noise control front and rear microphone

connector A (2P) No. 1 and No. 2 terminals individually.

Fig. 82: Checking Continuity Between Body Ground And No. 1, 2 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2007 Acura RL

2005-08 ACCESSORIES AND EQUIPMENT Audio System — RL

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© 2005 Mitchell Repair Information Company, LLC.

Is there continuity?

YES — Repair short in the wire between body ground and active noise control front or rear microphone
connector A (2P) No. 1 and No. 2 terminals.

NO — Go to step 18.

18. Reconnect the active noise control front and rear microphone control unit, and stereo amplifier

connectors.

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

20. Measure the voltage between the body ground and active noise control front or rear microphone

connector A (2P) No. 1 and No. 2 terminals individually while lightly tapping the microphones.

Fig. 83: Measuring Voltage Between Body Ground And No. 1, 2 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the voltage fluctuate when you tap on the microphones?

YES — Go to step 21.

NO — Replace the active noise control front or rear microphone.

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

22. Disconnect the active noise control unit 16P connector.

23. Disconnect active noise control front microphone connector A (3P).

24. Check for continuity between the active noise control unit 16P connector No. 3 terminal and active

noise control front microphone connector A (2P) No. 2 terminal.

2007 Acura RL

2005-08 ACCESSORIES AND EQUIPMENT Audio System — RL

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© 2005 Mitchell Repair Information Company, LLC.

Fig. 84: Checking Continuity Between No. 3 Terminal And No. 2 Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES — Go to step 25.

NO — Repair 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.

25. Check for continuity between the active noise control unit 16P connector No. 11 terminal and active

noise control front microphone connector A (2P) No. 1 terminal.

Fig. 85: Checking Continuity Between No. 11 Terminal And No. 1 Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES — Go to step 26.

NO — Repair open in the wire between the active noise control unit 16P connector No. 11 terminal and
active noise control front microphone connector A (2P) No. 1 terminal.

2007 Acura RL

2005-08 ACCESSORIES AND EQUIPMENT Audio System — RL

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