Acura RL. Manual - part 564

NO - Repair open in the wire between the climate control unit and the sunlight sensor. 

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

sensor 5P connector No. 2 terminal. 

Fig. 33: Checking Continuity Between Climate Control Unit 40P Connector 33 Terminal And 
Sunlight Sensor 5P Connector 2 Terminal 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 10. 

NO - Repair open in the wire between the climate control unit and the sunlight sensor. 

10. Reconnect the sunlight sensor 5P connector.  

11. Reconnect the climate control unit 40P connector.  

12. Test the sunlight sensor (see SUNLIGHT SENSOR TEST ). 

Is the sunlight sensor OK?  

YES - Check for loose wires or poor connections at the climate control unit 40P connector and at the 
sunlight sensor 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 sunlight sensor (see SUNLIGHT SENSOR REPLACEMENT ). 

DTC B1230 or TS sensor short is indicated: A Short in the Sunlight 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 B1230 or TS sensor short indicated?

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

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Friday, June 05, 2009 2:25:43 PM

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YES - Go to step 5. 

NO - Intermittent failure. 

5. Turn the ignition switch OFF.  

6. Disconnect the sunlight sensor 5P connector.  

7. Disconnect the climate control unit 40P connector.  

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

terminal. 

Fig. 34: Checking Continuity Between Body Ground And Climate Control Unit 40P Connector 
18 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 sunlight 
sensor. 

NO - Go to step 9. 

9. Check for continuity between the climate control unit 40P connector No. 18 and No. 33 terminals. 

Fig. 35: Checking Continuity Between Climate Control Unit 40P Connector 18 And 33 
Terminals 
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 40 

© 2005 Mitchell Repair Information Company, LLC. 

YES - Repair short in the wires between the climate control unit and the sunlight sensor.

NO - Go to step 10. 

10. Reconnect the sunlight sensor 5P connector.  

11. Reconnect the climate control unit 40P connector.  

12. Test the sunlight sensor (see SUNLIGHT SENSOR TEST ). 

Is the sunlight sensor 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 sunlight sensor (see SUNLIGHT SENSOR REPLACEMENT ). 

DTC B1231 or TE sensor open is indicated: An Open in the Evaporator 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 B1231 or TE sensor open indicated?  

YES - Go to step 4. 

NO - Intermittent failure, check for loose wires or poor connections on the evaporator temperature 
sensor circuit. 

5. Turn the ignition switch OFF.  

6. Remove the evaporator temperature sensor (see EVAPORATOR TEMPERATURE SENSOR 

REPLACEMENT ) and test it (see EVAPORATOR TEMPERATURE SENSOR TEST ). 

Is the evaporator temperature sensor OK?  

YES - Go to step 7. 

NO - Replace the evaporator temperature sensor. 

7. Disconnect the climate control unit 40P connector.  

8. Check for continuity between the climate control unit 40P connector No. 17 terminal and the 

evaporator temperature sensor 2P connector No. 1 terminal. 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 41 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 36: Checking Continuity Between Climate Control Unit 40P Connector 17 Terminal And 
Evaporator Temperature Sensor 2P Connector No. 1 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 evaporator temperature sensor. 

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

evaporator temperature sensor 2P connector No. 2 terminal. 

Fig. 37: Checking Continuity Between Climate Control Unit 40P Connector 33 Terminal And 
Evaporator Temperature Sensor 2P Terminal 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Check for loose wire or poor connections at the climate control unit 40P connector and at the 
evaporator 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. 

NO - Repair open in the wire between the climate control unit and the evaporator temperature sensor. 

DTC B1232 or TE sensor short is indicated: A Short in the Evaporator Temperature Sensor Circuit 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 42 

© 2005 Mitchell Repair Information Company, LLC.