Acura RL. Manual - part 570

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?  

YES - Repair short to body ground in the wire(s) between the climate control unit and the navigation 
unit. 

NO - Go to step 10. 

10. 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 - Check for loose wires or poor connections at the climate control unit 40P connector and at 
navigation unit connector A (20P). If the connections are good, substitute a known-good climate 
control unit, and recheck. If the symptom/ indication goes away, replace the original climate control 
unit. If the symptom/indication continues, substitute a known-good navigation unit, and recheck. If 
the symptom/indication goes away, replace the original navigation unit. 

DTC B2982 or BUS communication error is indicated: Climate Control Unit Lost Communication with Each 
Control Motor 

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 B2982 or BUS communication error indicated?  

YES - Go to step 5. 

NO - Intermittent failure, check for loose wires or poor connections on the each control motor circuit. 

5. Turn the ignition switch OFF.  

6. Test the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR TEST ), 

passenger's air mix control motor (see PASSENGER'S AIR MIX CONTROL MOTOR TEST ), 
driver's cool vent control motor (see DRIVER'S COOL VENT CONTROL MOTOR TEST ), 
passenger's cool vent control motor (see PASSENGER'S COOL VENT CONTROL MOTOR 
TEST ), mode control motor (see MODE CONTROL MOTOR TEST ), recirculation control motor 
(see RECIRCULATION CONTROL MOTOR TEST ), and rear vent control motor (see REAR 

From terminal

To terminals

6

7, 8

7

8

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

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VENT CONTROL MOTOR TEST ). 

Is each control motor OK?  

YES - Check for loose wires or poor connections at the climate control unit 40P connector and at the 
each control motor 5P connector. If the connections are good, substitute a known-good climate control 
unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. If 
the symptom/indication continues, replace the A/C wire harness. 

NO - Replace the control motor with a problem. 

DTC B2983 or R/F motor lock is indicated: A Problem in the Recirculation Control Linkage, Door, or Motor 

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 B2983 or R/F motor lock indicated?  

YES - Go to step 5. 

NO - Intermittent failure. 

5. Turn the ignition switch OFF.  

6. Test the recirculation control motor (see RECIRCULATION CONTROL MOTOR TEST ). 

Is the recirculation control motor OK?  

YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes 
away, replace the original climate control unit. 

NO - Replace the recirculation control motor (see RECIRCULATION CONTROL MOTOR 
TEST ), or repair the recirculation control linkage or door. 

DTC B2984 or DrC/V motor lock is indicated: A Problem in the Driver's Cool Vent Control Linkage, Door, or 
Motor 

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 B2984 or DrC/V motor lock indicated?

 

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2005-08 HVAC HVAC - RL

  

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YES - Go to step 5. 

NO - Intermittent failure. 

5. Turn the ignition switch OFF.  

6. Test the driver's cool vent control motor (see DRIVER'S COOL VENT CONTROL MOTOR 

TEST ). 

Is the driver's cool vent control motor OK?  

YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes 
away, replace the original climate control unit. 

NO - Replace the driver's cool vent control motor (see DRIVER'S COOL VENT CONTROL 
MOTOR REPLACEMENT ), or repair the driver's cool vent control linkage or door. 

DTC B2985 or PaC/V motor lock is indicated: A Problem in the Passenger's Cool Vent Control Linkage, Door, or 
Motor 

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 B2985 or PaC/V motor lock indicated?  

YES - Go to step 5. 

NO - Intermittent failure. 

5. Turn the ignition switch OFF.  

6. Test the passenger's cool vent control motor (see PASSENGER'S COOL VENT CONTROL 

MOTOR TEST ). 

Is the passenger's cool vent control motor OK?  

YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes 
away, replace the original climate control unit. 

NO - Replace the passenger's cool vent control motor (see PASSENGER'S COOL VENT 
CONTROL MOTOR REPLACEMENT ), or repair the passenger's cool vent control linkage or 
door. 

DTC B2987 or RrVEISIT motor lock is indicated: A Problem in the Rear Vent Control Linkage, Door, or Motor 

1. Clear the DTC with the HDS.  

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

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

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© 2005 Mitchell Repair Information Company, LLC. 

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 B2987 or RrVENT motor lock indicated?  

YES - Go to step 5. 

NO - Intermittent failure. 

5. Turn the ignition switch OFF.  

6. Test the rear vent control motor (see REAR VENT CONTROL MOTOR TEST ). 

Is the rear vent control motor OK?  

YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes 
away, replace the original climate control unit. 

NO - Replace the rear vent control motor (see REAR VENT CONTROL MOTOR 
REPLACEMENT ), or repair the rear vent control linkage or door. 

DTC B2991 or Audio communication error is indicated: Climate Control Unit Lost Communication with Audio 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 B2991 or Audio communication error indicated?  

YES - Go to step 5. 

NO - Intermittent failure, check for loose wires or poor connections on the audio unit circuit. 

5. Turn the ignition switch OFF.  

6. Disconnect audio unit connector B (32P).  

7. Disconnect the climate control unit 40P connector.  

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

audio unit connector B (32P). 

40P: 32P: 

No. 29 No. 26 

No. 30 No. 10 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 66 

© 2005 Mitchell Repair Information Company, LLC.