Acura RL. Manual - part 202

44. Do the self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).  

45. Press and release the "No. 1" button.  

46. Measure the voltage between the active noise control unit 16P connector No. 2 terminal and body 

ground. 

Fig. 93: Measuring Voltage Between Active Noise Control Unit 16P Connector No. 2 Terminal 
And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there about 2.5 V?  

YES - Replace the stereo amplifier (see STEREO AMPLIFIER REMOVAL/INSTALLATION ). 

NO - Go to step 47. 

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

48. Disconnect the active noise control unit 16P connector and stereo amplifier connector C (23P).  

49. Check for continuity between the active noise control unit 16P connector and stereo amplifier 

connector C (23P). 

16P: 

No. 1 

No. 2 

No. 9 

No. 10 

23P: 

No. 16 

No. 14 

No. 17 

 

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2005-08 ACCESSORIES AND EQUIPMENT Audio System - RL

  

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No. 15 

Fig. 94: Checking Continuity Between Active Noise Control Unit 16P Connector And Stereo 
Amplifier Connector C (23P) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 50. 

NO - Repair open in the wire(s) between the active noise control unit 16P connector and stereo 
amplifier connector C (14P). 

50. Check for continuity between body ground and active noise control unit 16P connector No. 1, 2,9, and 

10 terminals individually. 

Fig. 95: Checking Continuity Between Body Ground And Active Noise Control Unit 16P 
Connector No. 1, 2,9, And 10 Terminals 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wire(s) between the active noise control unit 16P connector and stereo 

 

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2005-08 ACCESSORIES AND EQUIPMENT Audio System - RL

  

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amplifier connector C (14P). 

NO - Replace the active noise control unit (see ACTIVE NOISE CONTROL UNIT 
REMOVAL/INSTALLATION ). 

51. Start the engine, and let the vehicle idle.  

52. Perform the self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).  

53. Press the No. 1 button. 

Can you hear the low-frequency hum ?  

YES - Go to step 54. 

NO - The system is OK. 

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

55. Disconnect the active noise control unit 16P connector and PCM connector A (31P).  

56. Check for continuity between the active noise control unit 16P connector No. 15 terminal and PCM 

connector A (31P) No. 23 terminal. 

Fig. 96: Checking Continuity Between Active Noise Control Unit 16P Connector No. 15 
Terminal And PCM Connector A (31P) No. 23 Terminal 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 57. 

NO - Repair open in the wire between the active noise control unit 16P connector No. 15 terminal and 
PCM connector A (31P) No. 23 terminal. 

57. Check for continuity between the active noise control unit 16P connector No. 15 terminal and body 

ground. 

 

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2005-08 ACCESSORIES AND EQUIPMENT Audio System - RL

  

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Fig. 97: Checking Continuity Between Active Noise Control Unit 16P Connector No. 15 
Terminal And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wire between body ground and the active noise control unit 16P connector 
No. 15 terminal and PCM connector A (31P) No. 23 terminal. 

NO - Replace the PCM. 

SOUND QUALITY DIAGNOSIS 

Special tools required  

Diagnostics CD 07AAZ-SDBA100 

Use the following tests to check sound quality. 

LEFT/RIGHT CHANNEL ID 

Do this test to confirm proper channel routing. 

1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio unit.  

2. Play track No. 1 (left, both, right channel ID) at a normal, or slightly higher than normal, volume 

level.  

3. The voice should be audible only from the channel or channels when indicated. 



If the channel ID is correct for each side, go to PHASE TEST.  



If the channel ID is not correct, check for 



Shorted speaker wire  



Faulty amplifier  



Faulty audio unit  

NOTE:

Before beginning the following tests, write down the client's bass, treble, 
fader and balance settings, then set them to their center positions for the 
testing.

 

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2005-08 ACCESSORIES AND EQUIPMENT Audio System - RL

  

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