Acura RL. Manual - part 569

3. Do the self-diagnostic with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION 

WITH THE HDS ) or climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC 
FUNCTION WITHOUT HDS ).  

4. Check for DTCs. 

Is DTC B2979 or PRE sensor open indicated?  

YES - Go to step 5. 

NO - Intermittent failure, check for loose wires or poor connections on the A/C pressure sensor 
circuit. 

5. Turn the ignition switch OFF.  

6. Disconnect the A/C pressure sensor 3P connector.  

7. Disconnect the climate control unit 40P connector.  

8. Check for continuity between the following terminals of the climate control unit 40P connector and 

the A/C pressure sensor 3P connector. 

40P: 3P: 

No. 12 No. 1 

No. 14 No. 2 

No. 33 No. 3 

Fig. 58: Checking Continuity Between Terminals Of Climate Control Unit 40P Connector And 
A/C Pressure Sensor 3P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 9. 

NO - Repair open in the wire(s) between the climate control unit and the A/C pressure sensor.

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 59 

© 2005 Mitchell Repair Information Company, LLC. 

9. Check for proper A/C system pressure. 

Is the pressure within specifications?  

YES - Check for loose wires or poor connections at the climate control unit 40P connector and at the 
A/C pressure sensor 3P connector. If the connections are good, replace the A/C pressure sensor. If the 
symptom/indication continues, substitute a known-good climate control unit, and recheck. If the 
symptom/indication goes away, replace the original climate control unit. 

NO - Repair the A/C pressure problem. 

DTC B2980 or PRE sensor short is indicated: A short in the A/C Pressure Sensor Circuit 

1. Clear the DTC with the HDS.  

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

3. Do the self-diagnostic with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION 

WITH THE HDS ) or climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC 
FUNCTION WITHOUT HDS ).  

4. Check for DTCs. 

Is DTC B2980 or PRE sensor short indicated?  

YES - Go to step 5. 

NO - Intermittent failure. 

5. Turn the ignition switch OFF.  

6. Disconnect the A/C pressure sensor 3P connector.  

7. Disconnect the climate control unit, 40P connector.  

8. Check for continuity between body ground and the climate control unit 40P connector No. 12 and No. 

14 terminals individually. 

Fig. 59: Checking Continuity Between Body Ground And Climate Control Unit 40P Connector 
No. 12 And No. 14 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 60 

© 2005 Mitchell Repair Information Company, LLC. 

YES - Repair short to body ground in the wire(s) between the climate control unit and the A/C 
pressure sensor. 

NO - Go to step 9. 

9. Check for continuity between the climate control unit 40P connector terminals as follows. 

CONNECTOR TERMINAL REFERENCE 

Is there continuity between any of the terminals?  

YES - Repair the short in the wires. 

NO - Go to step 10. 

10. Check for proper A/C system pressure. 

Is the pressure within specifications?  

YES - Replace the A/C pressure sensor. If the symptom/indication continues, substitute a known-
good climate control unit, and recheck. If the symptom/indication goes away, replace the original 
climate control unit. 

NO - Repair the A/C pressure problem. 

DTC B2981 or NAVI communication error is indicated: Climate Control Unit Lost Communication with Navigation 
Unit 

1. Clear the DTC with the HDS.  

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

3. Do the self-diagnostic with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION 

WITH THE HDS ) or climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC 
FUNCTION WITHOUT HDS ).  

4. Check for DTCs. 

Is DTC B2981 or NA VI communication error indicated?  

YES - Go to step 5. 

NO - Intermittent failure, check for loose wires or poor connections on the navigation unit and climate 
control unit circuit. 

5. Turn the ignition switch OFF.  

6. Disconnect navigation unit connector A (20P).  

7. Disconnect the climate control unit 40P connector. 

From terminal

To terminals

12

14, 33

14

33

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 61 

© 2005 Mitchell Repair Information Company, LLC. 

8. Check for continuity between the following terminals of the climate control unit 40P connector and 

navigation unit connector A (20P). 

40P: 20P: 

No. 6 No. 14 

No. 7 No. 4 

No. 8 No. 15 

Fig. 60: Checking Continuity Between Terminals Of Climate Control Unit 40P Connector And 
Navigation Unit Connector A (20P) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 9. 

NO - Repair open in the wire(s) between the climate control unit and the navigation unit. 

9. Check for continuity between body ground and the climate control unit 40P connector No. 6,7, and 8 

terminals individually. 

Fig. 61: Checking Continuity Between Body Ground And Climate Control Unit 40P Connector 
6,7, And 8 Terminals 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 62 

© 2005 Mitchell Repair Information Company, LLC.