Acura RL. Manual - part 572

40P: 3P: 

No. 3 No. 3 

No. 4 No. 2 

Fig. 69: Checking Continuity Between Terminals Of Climate Control Unit 40P Connector And 
A/C Compressor Clutch 3P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - The variable capacity control solenoid valve is faulty, replace the A/C compressor. 

NO - Repair open in the wire(s) between the climate control unit and the variable capacity control 
solenoid valve. 

CONTROL MOTOR POWER SUPPLY CIRCUIT TROUBLESHOOTING 

1. Check the No. 9 (7.5 A) fuse in the passenger's under-dash fuse/relay box. 

Is the fuse OK?  

YES - Go to step 2. 

NO - Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 9 (7.5 A) 
fuse circuit. 

2. Remove the control motor relay, and test it (see POWER RELAY TEST ). 

Is the relay OK?  

YES - Go to step 3. 

NO - Replace the control motor relay. 

3. Measure the voltage between body ground and the control motor relay 4P connector No. 1 and No. 4 

terminals individually. 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 71 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 70: Measuring Voltage Between Body Ground And Control Motor Relay 4P Connector 1 
And 4 Terminals 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Go to step 4. 

NO - Repair open in the wire(s) between the No. 9 (7.5 A) fuse in the passenger's under-dash fuse/ 
relay box and the control motor relay. 

4. Disconnect the climate control unit 40P connector.  

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

the control motor relay 4P connector. 

40P: 4P: 

No. 5 No. 2 

No. 39 No. 3 

Fig. 71: Checking Continuity Between Terminals Of Climate Control Unit 40P Connector And 
Control Motor Relay 4P Connector 
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 72 

© 2005 Mitchell Repair Information Company, LLC. 

YES - Check for loose wires or poor connections at the climate control unit 40P connector and at the 
control motor relay. 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 - Repair open in the wire(s) between the control motor relay and the climate control unit. 

ASPIRATOR FAN CIRCUIT TROUBLESHOOTING 

1. Check the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay box. 

Is the fuse OK?  

YES - Go to step 2. 

NO - Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 30 (7.5 A) 
fuse circuit. 

2. Disconnect the in-car temperature sensor 4P connector.  

3. Turn the ignition switch ON (II).  

4. Measure the voltage between the in-car temperature sensor 4P connector No. 1 terminal and the body 

ground. 

Fig. 72: Measuring Voltage Between In-Car Temperature Sensor 4P Connector 1 Terminal And 
Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Go to step 5. 

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 aspirator fan. 

5. Connect the in-car temperature sensor 4P connector No. 4 terminal to body ground with a jumper 

wire. 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 73 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 73: Connecting In-Car Temperature Sensor 4P Connector 4 Terminal To Body Ground 
With Jumper Wire 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Does the aspirator fan run?  

YES - Check for an open in the wire between the aspirator fan and body ground. If the wire is OK, 
check for poor ground at G503 (see GROUND TO COMPONENTS INDEX ). 

NO - Replace the aspirator fan. 

CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING 

1. Check the No. 30(7.5 A) fuse in the driver's under-dash fuse/relay box. 

Is the fuse OK?  

YES - Go to step 2. 

NO - Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 30 (7.5 A) 
fuse circuit. 

2. Disconnect the climate control unit 40P connector.  

3. Turn the ignition switch ON (II).  

4. Measure the voltage between the climate control unit 40P connector No. 20 terminal and body 

ground. 

Fig. 74: Measuring Voltage Between Climate Control Unit 40P Connector 20 Terminal And 
Body Ground 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 74 

© 2005 Mitchell Repair Information Company, LLC.