Acura RL. Manual - part 567

Fig. 47: Measuring Voltage Between Blower Motor Relay 4P Socket No. 2 Terminal And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Go to step 30. 

NO - Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ). 

30. Turn the ignition switch ON (II).  

31. Measure the voltage between the blower motor relay 4P socket No. 4 terminal and body ground. 

Fig. 48: Measuring Voltage Between Blower Motor Relay 4P Socket No. 4 Terminal And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Go to step 32. 

NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay 
box and the blower motor relay. 

32. Turn the ignition switch OFF.  

33. Check for continuity between the blower motor relay 4P socket No. 3 terminal and body ground. 

 

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. 

Fig. 49: Checking Continuity Between Blower Motor Relay 4P Socket No. 3 Terminal And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair open in the WHT wire between the blower motor relay and the blower motor. 

NO - Check for an open in the wire between the blower motor relay and body ground. If the wire is 
OK, check for poor ground at G301 (see GROUND TO COMPONENTS INDEX ). 

DTC B2975 or DrVENT sensor open is indicated: An Open in the Driver's Vent Air Temperature 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 B2975 or DrVENT sensor open indicated?  

YES - Go to step 5. 

NO - Intermittent failure, check for loose wires or poor connections on the driver's vent air 
temperature sensor circuit. 

5. Turn the ignition switch OFF.  

6. Remove the driver's vent air temperature sensor (see DRIVER'S VENT AIR TEMPERATURE 

SENSOR REPLACEMENT ) and test it (see VENT AIR TEMPERATURE SENSOR TEST ). 

Is the driver's vent air temperature sensor OK?  

YES - Go to step 7. 

NO - Replace the driver's vent air temperature sensor. 

7. Disconnect the climate control unit 40P connector.  

8. Check for continuity between the climate control unit 40P connector No. 36 terminal and the driver's 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 52 

© 2005 Mitchell Repair Information Company, LLC. 

vent air temperature sensor 2P connector No. 1 terminal. 

Fig. 50: Checking Continuity Between Climate Control Unit 40P Connector 36 Terminal And 
Driver's Vent Air Temperature Sensor 2P Terminal 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 9. 

NO - Repair open in the wire between the climate control unit and the driver's vent air temperature 
sensor. 

9. Check for continuity between the climate control unit 40P connector No. 33 terminal and the driver's 

vent air temperature sensor 2P connector No. 2 terminal. 

Fig. 51: Checking Continuity Between Climate Control Unit 40P Connector 33 Terminal And 
Driver's Vent Air Temperature Sensor 2P Terminal 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Check for loose wires or poor connections at the climate control unit 40P connector and at the 
driver's vent air temperature sensor 2P 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. 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 53 

© 2005 Mitchell Repair Information Company, LLC. 

NO - Repair open in the wire between the climate control unit and the driver's vent air temperature 
sensor. 

DTC B2976 or DrVENT sensor short is indicated: A Short in the Driver's Vent Air Temperature 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 B2976 or DrVENT sensor short indicated?  

YES - Go to step 5. 

NO - Intermittent failure. 

5. Turn the ignition switch OFF.  

6. Remove the driver's vent air temperature sensor (see DRIVER'S VENT AIR TEMPERATURE 

SENSOR REPLACEMENT ) and test it (see VENT AIR TEMPERATURE SENSOR TEST ). 

Is the driver's vent air temperature sensor OK?  

YES - Go to step 7. 

NO - Replace the driver's vent air temperature sensor. 

7. Disconnect the climate control unit 40P connector.  

8. Check for continuity between body ground and the climate control unit 40P connector No. 36 

terminal. 

Fig. 52: Checking Continuity Between Body Ground And Climate Control Unit 40P Connector 
36 Terminal 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short to body ground in the wire between the climate control unit and the driver's vent 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 54 

© 2005 Mitchell Repair Information Company, LLC.