Acura RL. Manual - part 556

Fig. 6: Identifying A/C Line Components 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

GENERAL TROUBLESHOOTING INFORMATION 

How to Check for DTCs with the HDS 

1. Make sure the ignition switch is OFF.  

2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

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Friday, June 05, 2009 2:25:42 PM

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dashboard. 

Fig. 7: Identifying HDS To Data Link Connector (DLC) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. Turn the ignition switch ON (II).  

4. Make sure the HDS communicates with the vehicle and the climate control unit. If it doesn't, 

troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).  

5. Select HVAC/CLIMATE CONTROL in the BODY ELECTRICAL menu.  

6. Select DTCs in the HVAC/CLIMATE CONTROL menu.  

7. Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated DTC 

troubleshooting. If no DTCs are indicated, refer to SYMPTOM TROUBLESHOOTING. 

How to Use the Self-diagnostic Function with the HDS 

1. Make sure the ignition switch is OFF.  

2. Connect the HDS to the data link connector (DLC).  

3. Turn the ignition switch ON (II).  

4. Make sure the HDS communicates with the vehicle and the climate control unit. If it doesn't, 

troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).  

5. Select HVAC/CLIMATE CONTROL in the BODY ELECTRICAL menu.  

6. Select INSPECTION in the HVAC/CLIMATE CONTROL menu.  

7. Select CLIMATE CONTROL SELF TEST in the INSPECTION menu.  

8. Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated DTC 

troubleshooting. 

NOTE:



After troubleshooting, clear the DTCs with the HDS.  



For specific operations, refer to the user's manual that came with 
the HDS.  

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

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© 2005 Mitchell Repair Information Company, LLC. 

How to Use the Self-diagnostic Function without HDS 

The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following:

1. Turn the ignition switch OFF and then ON (II).  

2. Press and hold the OFF button, then press the rear window defogger button five times within 10 

seconds. Release the buttons. All the LEDs blink for 2 seconds, then the self-diagnostic function 
begins. 

Fig. 8: Identifying Rear Window Defogger Button And Off Button 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Set the Navigation System Diagnostic Mode  

3. Turn the ignition switch ON (II). Use the navigation display hard buttons as described below: 



Make sure the battery is connected, then press and hold the three buttons (Menu, Map/Guide, 
and Cancel), and keep them pressed for approximately 5 seconds. The display screen will go 
directly to the "Select Diagnosis Items" menu shown below.  



Touch the Unit Check button, then touch the Aircon button.  



If there is any problem in the system, the display panel will indicate it. To determine the 
meaning of the indication, refer to the table that follows.  



If there are no problems detected, the display panel will be blank. 

NOTE:



After troubleshooting, clear the DTCs with the HDS.  



For specific operations, refer to the user's manual that came with 
the HDS.  

NOTE:

Before troubleshooting the climate control system, refer to B-CAN System 
Diagnosis Test Mode A Troubleshooting (see TROUBLESHOOTING - B-CAN 
SYSTEM DIAGNOSIS TEST MODE A ).

NOTE:

The blower motor will run at various speeds when in the self-diagnostic 
mode.

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:42 PM

Page 9 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 9: Navigation System Diagnostic Mode Diagram (Display Panel) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Canceling the Self-diagnostic Function  

4. Turn the ignition switch OFF to cancel the self-diagnostic function. After completing repair work, run 

the self-diagnostic function again to make sure that there are no other malfunctions.  

Checking for DTCs 

NOTE:

In the case of multiple problems, the display panel will indicate them all. If 
the navigation display indicates TR sensor open, TMA sensor open, TS 
sensor open, TE sensor open, DrVENT sensor open, PaVENT sensor open, 
and PRE sensor open at the same time, there may be an open in the common 
ground wire.

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:42 PM

Page 10 

© 2005 Mitchell Repair Information Company, LLC.