Acura RL. Manual - part 576

Fig. 94: Measuring Resistance Between 1 And 4 Terminals Of Power Transistor 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

4. Carefully release the lock tab on the No. 3 terminal (RED/BLK) (A) in the 5P connector, then remove 

the terminal and insulate it from body ground. 

Fig. 95: Removing No. 3 Terminal (RED/BLK) From 5P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

5. Reconnect the 5P connector to the power transistor.  

6. Make sure the RED/BLK wire is completely isolated, then supply 12 V to the No. 3 cavity with a 

jumper wire.  

7. Turn the ignition switch ON (II), and check that the blower motor runs. 



If the blower motor does not run, replace the power transistor. 



If the blower motor runs, the power transistor is OK.  

DRIVER'S AIR MIX CONTROL MOTOR TEST 

NOTE:

A faulty blower motor can cause the power transistor to fail. If the 
power transistor is replaced, also check the blower motor for 
binding, and replace it if necessary.

NOTE:

Before testing, check for HVAC DTCs (see GENERAL TROUBLESHOOTING 
INFORMATION ).

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 87 

© 2005 Mitchell Repair Information Company, LLC. 

1. Disconnect the 5P connector from the driver's air mix control motor. 

2. Connect battery power to the No. 1 terminal of the driver's air mix control motor, and ground the No. 

2 terminal; the driver's air mix control motor should run, and stop at Max Cool. If it doesn't, reverse 
the connections; the driver's air mix control motor should run, and stop at Max Hot. 

Fig. 96: Identifying Driver's Air Mix Control Motor Terminals 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. If the driver's air mix control motor did not run in step 2, remove it, then check the driver's air mix 

control linkage and door for smooth movement. 



If the linkage and door move smoothly, replace the driver's air mix control motor (see 
DRIVER'S AIR MIX CONTROL MOTOR REPLACEMENT ).  



If the linkage or door sticks or binds, repair them as needed.  

DRIVER'S AIR MIX CONTROL MOTOR REPLACEMENT 

1. Remove the driver's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER 

REMOVAL/INSTALLATION ).  

2. Disconnect the connectors (A) from the power tilt/ telescopic steering control unit, the adaptive front 

lighting control unit, the electronically controlled power steering control unit, and the daytime running 
lights control unit. Remove the relay (B) and the power tilt/telescopic steering control unit (C), then 
remove the self-tapping screws and the bracket (D). 

NOTE:

Incorrectly applying power and ground to the driver's air mix control 
motor will damage it. Follow the instructions carefully.

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 88 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 97: Identifying Control Units And Connectors
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. Disconnect the 5P connector (A) from the driver's air mix control motor. Remove the connector clip 

(B). Remove the self-tapping screws and the driver's air mix control motor (C). 

Fig. 98: Identifying Driver's Air Mix Control Motor, Connector And Screws 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

4. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly engaged 

with the linkage. After installation, make sure the motor runs smoothly.  

PASSENGER'S AIR MIX CONTROL MOTOR TEST 

1. Disconnect the 5P connector from the passenger's air mix control motor. 

2. Connect battery power to the No. 1 terminal of the passenger's air mix control motor, and ground the 

No. 2 terminal; the passenger's air mix control motor should run, and stop at Max Hot. If it doesn't, 
reverse the connections; the passenger's air mix control motor should run, and stop at Max Cool. 

Fig. 99: Identifying Passenger's Air Mix Control Motor Terminals 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE:

Before testing, check for HVAC DTCs (see GENERAL TROUBLESHOOTING 
INFORMATION ).

NOTE:

Incorrectly applying power and ground to the passenger's air mix 
control motor will damage it. Follow the instructions carefully.

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 89 

© 2005 Mitchell Repair Information Company, LLC. 

3. If the passenger's air mix control motor did not run in step 2, remove it, then check the passenger's air 

mix control linkage and door for smooth movement. 



If the linkage and door move smoothly, replace the passenger's air mix control motor (see 
PASSENGER'S AIR MIX CONTROL MOTOR REPLACEMENT ).  



If the linkage or door sticks or binds, repair them as needed.  

PASSENGER'S AIR MIX CONTROL MOTOR REPLACEMENT 

1. Remove the glove box (see GLOVE BOX REMOVAL/INSTALLATION ).  

2. Remove the self-tapping screws, bolt, and the duct (A). 

Fig. 100: Identifying Air Duct And Fasteners 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. Disconnect the 5P connector (A) from the passenger's air mix control motor. Remove the self-tapping 

screws and the passenger's air mix control motor (B) from the heater unit. 

Fig. 101: Identifying Passenger's Air Mix Control Motor And Fasteners 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

4. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly engaged 

with the linkage. After installation, make sure the motor runs smoothly.  

DRIVER'S COOL VENT CONTROL MOTOR TEST 

NOTE:

Before testing, check for HVAC DTCs (see GENERAL TROUBLESHOOTING 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 90 

© 2005 Mitchell Repair Information Company, LLC.