Acura RL. Manual - part 566

YES - Go to step 9. 

NO - Go to step 24. 

9. Turn the ignition switch OFF.  

10. Disconnect the jumper wire.  

11. Disconnect the power transistor 5P connector.  

12. Check for continuity between the power transistor 5P connector No. 5 terminal and body ground. 

Fig. 41: Checking Continuity Between Power Transistor 5P Connector 5 Terminal And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 13. 

NO - Check for an open in the wire between the power transistor and body ground. If the wire is OK, 
check for poor ground at G506 (see GROUND TO COMPONENTS INDEX ). 

13. Connect the power transistor 5P connector No. 4 and No. 5 terminals with a jumper wire. 

Fig. 42: Connecting Power Transistor 5P Connector 4 And 5 Terminals With Jumper Wire 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

14. Turn the ignition switch ON (II). 

Does the blower motor run at high speed?

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 47 

© 2005 Mitchell Repair Information Company, LLC. 

YES - Go to step 15. 

NO - Repair open in the BLU/RED wire between the power transistor and the blower motor. 

15. Turn the ignition switch OFF.  

16. Disconnect the jumper wire.  

17. Disconnect the climate control unit 40P connector.  

18. Check for continuity between body ground and the climate control unit 40P connector No. 9 and No. 

10 terminals individually. 

Fig. 43: Checking Continuity Between Body Ground And Climate Control Unit 40P Connector 
9 And 10 Terminals 
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 power 
transistor. 

NO - Go to step 19. 

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

the power transistor 5P connector. 

40P: 5P: 

No. 9 No. 1 

No. 10 No. 3 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 48 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 44: Checking Continuity Between Terminals Of Climate Control Unit 40P Connector And 
Power Transistor 5P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 20. 

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

20. Turn the ignition switch ON (II).  

21. Measure the voltage between body ground and the climate control unit 40P connector No. 9 and No. 

10 terminals individually. 

Fig. 45: Measuring Voltage Between Body Ground And Climate Control Unit 40P Connector 9 
And 10 Terminals 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there voltage?  

YES - Repair short to power in the wire(s). 

NO - Go to step 22. 

22. Reconnect the climate control unit 40P connector.  

23. Test the power transistor (see POWER TRANSISTOR TEST ). 

Is the power transistor OK?  

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 49 

© 2005 Mitchell Repair Information Company, LLC. 

YES - Check for loose wires or poor connections at the climate control unit 40P connector and at the 
power transistor 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. 

NO - Replace the power transistor (see POWER TRANSISTOR TEST ). 

24. Disconnect the jumper wire.  

25. Disconnect the blower motor 2P connector.  

26. Measure the voltage between the blower motor 2P connector No. 1 terminal and body ground. 

Fig. 46: Measuring Voltage Between Blower Motor 2P Connector 1 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Replace the blower motor (see BLOWER UNIT COMPONENT REPLACEMENT ). 

NO - Go to step 27. 

27. Turn the ignition switch OFF.  

28. Remove the blower motor relay from the under-hood fuse/relay box, and test it (see POWER 

RELAY TEST ). 

Is the relay OK?  

YES - Go to step 29. 

NO - Replace the blower motor relay. 

29. Measure the voltage between the blower motor relay 4P socket No. 2 terminal and body ground. 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 50 

© 2005 Mitchell Repair Information Company, LLC.