Acura RL. Manual - part 565

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 B1232 or TE sensor short Indicated?  

YES - Go to step 5. 

NO - Intermittent failure. 

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 body ground and the climate control unit 40P connector No. 17 

terminal. 

Fig. 38: Checking Continuity Between Body Ground And Climate Control Unit 40P Connector 
17 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 evaporator 
temperature sensor. 

NO - Go to step 9. 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 43 

© 2005 Mitchell Repair Information Company, LLC. 

9. Check for continuity between the climate control unit 40P connector No. 17 and No. 33 terminals. 

Fig. 39: Checking Continuity Between Climate Control Unit 40P Connector 17 And 33 
Terminals 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short to in the wires between the climate control unit and the evaporator temperature 
sensor. 

NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes 
away, replace the original climate control unit. 

DTC B1235 or DrA/M motor lock is indicated: A Problem in the Driver's Air Mix Control Linkage, Door, or Motor 

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 B1235 or DrA/M motor lock indicated?  

YES - Go to step 5. 

NO - Intermittent failure. 

5. Turn the ignition switch OFF.  

6. Test the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR TEST ). 

Is the driver's air mix control motor 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 driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR 
REPLACEMENT ), or repair the driver's air mix control linkage or door. 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 44 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B1238 or PaA/M motor lock is indicated: A Problem in the Passenger's Air Mix Control Linkage, Door, or 
Motor 

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 B1238 or PaA/M motor lock indicated?  

YES - Go to step 5. 

NO - Intermittent failure. 

5. Turn the ignition switch OFF.  

6. Test the passenger's air mix control motor (see PASSENGER'S AIR MIX CONTROL MOTOR 

TEST ). 

Is the passenger's air mix control motor 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 passenger's air mix control motor (see PASSENGER'S AIR MIX CONTROL 
MOTOR REPLACEMENT ), or repair the passenger's air mix control linkage or door. 

DTC B1240 or Mode motor lock is indicated: A Problem in the Mode Control Linkage, Doors, or Motor 

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 B1240 or Mode motor lock indicated?  

YES - Go to step 5. 

NO - Intermittent failure. 

5. Turn the ignition switch OFF.  

6. Test the mode control motor (see MODE CONTROL MOTOR TEST ). 

Is the mode control motor OK?  

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 45 

© 2005 Mitchell Repair Information Company, LLC. 

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 mode control motor (see MODE CONTROL MOTOR REPLACEMENT ), or 
repair the mode control linkage or doors. 

DTC B1241 or Blower motor lock is indicated: A Problem in the Blower Motor 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 B1241 or Blower motor lock indicated?  

YES - Go to step 5. 

NO - Intermittent failure, check for loose wires or poor connections on the blower motor circuit. 

5. Turn the ignition switch OFF.  

6. Check the No. 21 (40 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the 

driver's under-dash fuse/relay box. 

Are the fuses OK?  

YES - Go to step 7. 

NO - Replace the fuses, and recheck. If the fuses blow again, check for a short in the No. 21 (40 A) 
and No. 30 (7.5 A) fuses circuit. 

7. Connect the blower motor 2P connector No. 2 terminal to body ground with a jumper wire. 

Fig. 40: Connecting Blower Motor 2P Connector 2 Terminal To Body Ground With Jumper 
Wire 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

8. Turn the ignition switch ON (II). 

Does the blower motor run?  

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 46 

© 2005 Mitchell Repair Information Company, LLC.