Acura RL. Manual - part 188

Fig. 24: Identifying Active Noise Control (ANC) System Check Mode 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

HOW TO CHECK THE ACTIVE NOISE CONTROL SYSTEM IN THIS CHECK MODE 



With the engine stopped, and while in DIAG mode, turn the ANC ON to OFF by pressing the No. 1 
button. A low-frequency hum (50 Hz) should sound for about a minute. 



If the hum does not sound, check for an open in the wire between the active noise control unit 
and the audio unit.  



If the hum does not sound for a minute, check for an open in the wire between active noise 
control unit and the microphone.  



Start the engine while the hum is sounding. The hum should stop. If the hum does not stop, check for 
an open in the wire (NEP line) between the active noise control unit and the PCM.  



Enter the "DIAG" mode with the engine running (900 RPM), apply the brake pedal and shift to D 
position, turn the "ANC ON" to "ANC OFF" by pressing the No. 1 button on the audio unit, then turn 
the "ANC OFF" to "ANC ON". After about 3 seconds, the active noise control system should activate. 
(NOTE: When any of the doors are opened, the function is stopped.)  

ERROR CODES 

The audio system displays error codes when a problem is detected with the CD changer, the audio disc, the 
XM radio, or the anti-theft code. 

CD Error Codes  

CD ERROR CODES 

Error Code 

Displayed

Possible Cause

Solution

DISC

Cannot read disc.

Eject the disc and try another one.

DISC 
ERROR

There is a problem with the disc 
player. A common problem is disc 
labels coming off the disc while in 
the player.

Try to eject the disc and try another one. If there is 
still a problem, replace the audio unit.

DISC 
FORMAT

A disc was inserted that has a format 
that is not recognized.

Eject the disc, and try another one.

Disc player is hot. This can happen 

Park the vehicle in a cooler place for a while and 
try the disc player again. If the error code is still 

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Audio System - RL

  

me 

 

Friday, June 05, 2009 3:53:06 PM

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© 2005 Mitchell Repair Information Company, LLC. 

XM Error Codes  

XM ERROR CODES 

Audio Unit Error Codes  

AUDIO UNIT ERROR CODES 

SYMPTOM TROUBLESHOOTING 

POOR AM OR FM RADIO RECEPTION OR INTERFERENCE 

DISC-H

if the vehicle is parked out in the hot 
sun all day.

present, try another disc. If the error code is still 
present, replace the audio unit.

Error Code 

Displayed

Possible Cause

Solution

XM 
LOADING

XM radio is acquiring 
audio or program 
information.

Wait until the radio receives the information.

XM OFF AIR

XM channel not in 
service.

Try another XM channel.

XM NO 
SIGNAL

Loss of signal.

Both terrestrial and satellite antennas have lost signal. Park 
the vehicle outside with a clear view of the southern horizon.

XM 
UPDATING

XM radio is receiving 
information update from 
the network.

This message will disappear once the update finishes.

XM 
ANTENNA

XM antenna error.

Repair open or short in the terrestrial or satellite antenna. 
Substitute the XM antenna and recheck. If the error is gone, 
replace the original XM antenna. If the error is still present, 
replace the antenna lead.

--

No signal from XM.

Check a known-good vehicle with XM radio. If the known-
good vehicle has the same symptoms, contact XM Satellite 
Radio at (800) 852-9696.

Error Code 

Displayed

Possible Cause

Solution

ERR1

Anti-theft code 
mismatch (1

st

 try).

Enter the correct anti-theft code.

ERRE

Anti-theft code 
mismatch (10

th

 try).

Remove fuse No. 5 (10A) in the driver's under-dash fuse/relay 
box, then reinsert it. You will have 10 more tries to enter the 
correct anti-theft code.

NOTE:



Check the vehicle battery condition first.  



Check the radio reception in an open area. Poor reception/interference 
can be caused by any of these conditions. 



The radio station is too far away.  



Atmospheric conditions are unfavorable.  

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Audio System - RL

  

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Friday, June 05, 2009 3:53:06 PM

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© 2005 Mitchell Repair Information Company, LLC. 

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

2. Do the seek stop test (see SEEK STOP TEST ). 

Is the test vehicle within 10% of the known-good vehicle?  

YES - Multipath interference or weak station. Operation is normal. 

NO - Go to step 3. 

3. Check if the radio reception/interference is the same in several locations. 

Is the reception/interference the same?  

YES - Go to step 4. 

NO - Multipath interference or weak station. Operation is normal. 

4. Check the reception/interference while the engine is running. 

Is there noise (static or whine) only with the engine running?  

YES - Check the antenna and radio grounds. If OK, check the charging system and the ignition 
system. 

NO - Go to step 5. 

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

6. Wrap aluminum foil (A) around the tip of a tester probe (B) as shown. 

Fig. 25: Identifying Aluminum Foil And Tip Of Tester Probe



A tall buildings, mountains, or a high-voltage power lines are 
nearby.  



Always check the connectors for poor connection or loose 
terminals.  



After market window tint.  

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Audio System - RL

  

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© 2005 Mitchell Repair Information Company, LLC. 

Courtesy of AMERICAN HONDA MOTOR CO., INC.

7. Touch one tester probe to the window near the antenna terminal (A), and move the other tester probe 

along the antenna wires to check for continuity. Repair if there is no continuity. 

Fig. 26: Checking For Continuity Along Antenna Wires 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

8. Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ). Check the audio unit 

connector E (5P) connection. 

Is it properly connected?  

YES - Go to step 9. 

NO - Reconnect the audio unit connector E (5P), and recheck the function. 

9. Disconnect the antenna cable 3P connectors from the AM/FM antenna amplifier (see AM/FM 

ANTENNA AMPLIFIER REPLACEMENT ).  

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

11. Turn on the audio unit and select AM or FM.  

12. Measure the voltage between the AM/FM main antenna amplifier connector No. 3 terminal at the 

AM/FM antenna amplifier lead and body ground. 

Fig. 27: Measuring Voltage Between No. 3 Terminal And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Audio System - RL

  

me 

 

Friday, June 05, 2009 3:53:06 PM

Page 33 

© 2005 Mitchell Repair Information Company, LLC.