Auxiliary Climate Control: Diagnosis Ford Explorer V

Related Module DTC Chart(s)

This table contains references to module DTC charts which are related to this system.

Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to ENGINE CONTROLS - DIAGNOSTIC METHODS (EXCEPT DIESEL & HYBRID) for information regarding Ford-specific diagnostic practices.

SYMPTOM CHART

Visual Inspection and Diagnostic Pre-checks

1. Inspect BJB fuses 39 (40A) and 93 (5A)

Scheme 4

Scheme 5

Scheme 6

Scheme 7

1. CHECK THE HVAC MODULE FOR DTCs Ignition ON. Using a scan tool, perform a HVAC module self-test. Are any DTCs present? Yes For DTC B10B0:12, GO to 2 . For DTC B10B0:13, GO to 4 . For DTC B10BA:14, GO to 7 . No : GO to 7 .
2. CHECK THE AUXILIARY BLOWER MOTOR RELAY FUNCTIONALITY Install a known good auxiliary blower motor relay. Does the auxiliary blower motor function correctly? Yes: INSTALL a new auxiliary blower motor relay. No : GO to 3 .
3. CHECK THE AUXILIARY BLOWER MOTOR CONTROL CIRCUIT FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: Auxiliary Blower Motor Relay. Disconnect: HVAC module C228B. Ignition ON. Measure: BJB Ground Auxiliary Blower Motor Relay Socket Ground Pin Circuit Measurement / Action Pin Circuit 2 CH112 (VT/WH) - Ground Is any voltage present? Yes: REPAIR the circuit. No : GO to 16 .
4. CHECK THE AUXILIARY BLOWER MOTOR RELAY FUNCTIONALITY Install a known good auxiliary blower motor relay. Does the auxiliary blower motor function correctly? Yes: INSTALL a new auxiliary blower motor relay. No : GO to 5 .
5. CHECK THE AUXILIARY BLOWER MOTOR RELAY COIL SUPPLY VOLTAGE Ignition OFF. Disconnect: Auxiliary Blower Motor Relay. Ignition ON. Measure: BJB Ground Auxiliary Blower Motor Relay Socket Ground Pin Circuit Measurement / Action Pin Circuit 1 CBB93 (GY/BN) - Ground Is the voltage greater than 11 volts? Yes: GO to 6 . No : VERIFY BJB fuse 93 (5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate «OEM WIRING DIAGRAMS»(ref-514995) to identify the possible causes of the circuit short.
6. CHECK THE AUXILIARY BLOWER MOTOR RELAY COIL CONTROL CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: HVAC Module C228B. Measure: BJB HVAC Module Auxiliary Blower Motor Relay Socket C228B Pin Circuit Measurement / Action Pin Circuit 2 CH112 (VT/WH) 20 CH112 (VT/WH) Is the resistance less than 3 ohms? Yes: GO to 16 . No : REPAIR the circuit.
7. CHECK THE AUXILIARY BLOWER MOTOR RELAY FUNCTIONALITY Install a known good auxiliary blower motor relay. Does the auxiliary blower motor function correctly? Yes: INSTALL a new auxiliary blower motor relay. No : GO to 8 .
8. CHECK FOR VOLTAGE AT THE AUXILIARY BLOWER MOTOR RELAY SWITCH CONTACT Disconnect: Auxiliary Blower Motor Relay Measure: BJB Ground Auxiliary Blower Motor Relay Socket Ground Pin Circuit Measurement / Action Pin Circuit 3 SBB39 (WH/RD) - Ground Is the voltage greater than 11 volts? Yes: GO to 9 . No : VERIFY BJB fuse 39 (40A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate «OEM WIRING DIAGRAMS»(ref-514995) to identify the possible causes of the circuit short.
9. CHECK VOLTAGE TO THE AUXILIARY BLOWER MOTOR WITH THE AUXILIARY BLOWER MOTOR RELAY BYPASSED Ignition OFF. Disconnect: Auxiliary Blower Motor. Disconnect: Auxiliary Blower Motor Speed Control. Connect a fused jumper: BJB BJB Auxiliary Blower Motor Relay Socket Auxiliary Blower Motor Relay Socket Pin Circuit Measurement / Action Pin Circuit 3 SBB39 (WH/RD) 5 CHA02 (BN/GN) Measure: Auxiliary Blower Motor Ground C3021 Ground Pin Circuit Measurement / Action Pin Circuit 2 CHA02 (BN/GN) - Ground Is the voltage greater than 11 volts? Yes: GO to 10 . No : REPAIR the circuit.
10. CHECK THE AUXILIARY BLOWER MOTOR SPEED CONTROL POWER CIRCUIT FOR VOLTAGE Measure: Auxiliary Blower Motor Speed Control Ground C3002 Ground Pin Circuit Measurement / Action Pin Circuit 2 CHA02 (BN/GN) - Ground Is the voltage greater than 11 volts? Yes: DISCONNECT the fused jumper wire. CONNECT the auxiliary blower motor relay and the auxiliary blower motor speed control. GO to 11 . No : REPAIR the circuit.
11. CHECK FOR AUXILIARY BLOWER MOTOR FUNCTIONALITY WITH A TEST LIGHT IN PLACE OF THE AUXILIARY BLOWER MOTOR NOTE: This step uses a test light to simulate normal circuit loads. Use only the test light recommended in the «SPECIAL TOOL(S)»(ref-517581-S39794926542012121200000) table at the Climate Control information or equivalent. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector. Connect: Auxiliary Blower Motor Auxiliary Blower Motor C3021 C3021 Pin Circuit Measurement / Action Pin Circuit 2 CHA02 (BN/GN) Test Light 1 VHA19 (BN) Ignition ON. Select panel mode with the auxiliary blower motor on high. Does the test lamp illuminate? Yes: INSTALL a new auxiliary blower motor. REFER to «Auxiliary Blower Motor»(ref-517583-S39375998262012121200000) . No : GO to 12 .
12. CHECK THE AUXILIARY BLOWER MOTOR GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: Auxiliary Blower Motor Speed Control. Measure: Auxiliary Blower Motor Auxiliary Blower Motor Speed Control C3021 C3002 Pin Circuit Measurement / Action Pin Circuit 1 VHA19 (BN) 1 VHA19 (BN) Is the resistance less than 3 ohms? Yes: GO to 13 . No : REPAIR the circuit.
13. CHECK THE AUXILIARY BLOWER MOTOR SPEED CONTROL GROUND CIRCUIT FOR AN OPEN Measure: Auxiliary Blower Motor Speed Control Ground C3002 Ground Pin Circuit Measurement / Action Pin Circuit 6 GD149 (BK/GY) - Ground Is the resistance less than 3 ohms? Yes: GO to 14 . No : REPAIR the circuit.
14. CHECK THE AUXILIARY BLOWER MOTOR SPEED CONTROL COMMAND CIRCUIT FOR A SHORT TO GROUND Disconnect: HVAC Module C228B. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 19 CHA05 (BN/RD) - Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 15 . No : REPAIR the circuit.
15. CHECK THE AUXILIARY BLOWER MOTOR SPEED CONTROL COMMAND CIRCUIT FOR AN OPEN Measure: Auxiliary Blower Motor Speed Control HVAC Module C3002 C228B Pin Circuit Measurement / Action Pin Circuit 5 VHA25 (BN/VT) 19 CHA05 (BN/RD) Is the resistance less than 3 ohms? «Auxiliary Blower Motor Speed Control»(ref-517583-S40328299282012121200000) Yes: INSTALL a new auxiliary blower motor speed control. REFER to «Auxiliary Blower Motor Speed Control»(ref-517583-S40328299282012121200000) . If the concern is still present, GO to 16 . No : REPAIR the circuit.
16. CHECK FOR CORRECT HVAC MODULE OPERATION Ignition OFF. Disconnect and inspect all HVAC module connectors. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Reconnect all disconnected connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - DATC»(ref-517581-S13895863382012121200000) Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - EMTC»(ref-517582-S02745705852012121200000) . No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

Pinpoint Test

1. CHECK THE HVAC MODULE FOR DTCs Ignition ON. Using a scan tool, perform the HVAC module self-test. Is DTC B10BA:12 present? Yes: GO to 5 . No : GO to 2 .
2. CHECK THE AUXILIARY BLOWER MOTOR RELAY COIL SWITCH GROUND CIRCUIT FOR A SHORT TO GROUND Ignition OFF. Disconnect: Auxiliary Blower Motor Relay. Disconnect: HVAC Module C228B. Measure: BJB Ground Auxiliary Blower Motor Relay Socket Ground Pin Circuit Measurement / Action Pin Circuit 2 CH112 (VT/WH) - Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 3 . No : REPAIR the circuit.
3. CHECK THE AUXILIARY BLOWER MOTOR VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE Disconnect: Auxiliary Blower Motor Speed Control. Disconnect: Auxiliary Blower Motor. Ignition ON. Measure: Auxiliary Blower Motor Ground C3021 Ground Pin Circuit Measurement / Action Pin Circuit 2 CHA02 (BN/GN) - Ground Is any voltage present? Yes: REPAIR the circuit. No : GO to 4 .
4. CHECK THE AUXILIARY BLOWER MOTOR GROUND CIRCUIT FOR A SHORT TO GROUND Ignition OFF. Measure: Auxiliary Blower Motor Ground C3021 Ground Pin Circuit Measurement / Action Pin Circuit 1 VHA19 (BN) - Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 5 . No : REPAIR the circuit.
5. CHECK THE AUXILIARY BLOWER MOTOR SPEED CONTROL COMMAND CIRCUIT FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: HVAC Module C228B. Disconnect: Auxiliary Blower Motor Speed Control. Ignition ON. Measure: Auxiliary Blower Motor Speed Control Ground C3002 Ground Pin Circuit Measurement / Action Pin Circuit 5 VHA25 (BN/VT) - Ground Is any voltage present? Yes: REPAIR the circuit. No : GO to 6 .
6. CHECK THE AUXILIARY BLOWER MOTOR SPEED CONTROL Install a known good auxiliary blower motor speed controller. Reconnect all disconnected connectors. Make sure they seat and latch correctly. Ignition ON. Operate the auxiliary blower motor. Does the auxiliary blower motor function correctly? Yes: INSTALL a new auxiliary blower motor speed control. REFER to «Auxiliary Blower Motor Speed Control»(ref-517583-S40328299282012121200000) . No : GO to 7 .
7. CHECK FOR CORRECT HVAC MODULE OPERATION Ignition OFF. Disconnect and inspect all HVAC module connectors. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - EMTC»(ref-517582-S02745705852012121200000) or «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - DATC»(ref-517581-S13895863382012121200000) No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

Note. The auxiliary temperature blend door actuator connector in the pinpoint test is difficult to access. Before disconnecting the auxiliary temperature blend door actuator, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.

Scheme 8

1. CHECK THE HVAC MODULE FOR DTCs Ignition ON. Using a scan tool, perform a HVAC module self-test. Are any DTCs present? Yes: For DTC B11E3:11, GO to 2 . For DTC B11E3:12, GO to 3 . For DTC B11E3:13, GO to 5 . For DTC B10B7:11, GO to 6 . For DTC B10B7:15, GO to 8 . No : GO to 2 .
2. CHECK THE AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND Ignition OFF. Disconnect: Auxiliary Temperature Blend Door Actuator. Disconnect: HVAC Module C228B. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 28 CH245 (BU/BN) - Ground 27 CH244 (GY) - Ground Are the resistances greater than 10, 000 ohms? Yes: GO to 4 . No : REPAIR the circuit in question.
3. CHECK THE AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: Auxiliary Temperature Blend Door Actuator. Disconnect: HVAC Module C228B. Ignition ON. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 28 CH245 (BU/BN) - Ground 27 CH244 (GY) - Ground Is any voltage present? Yes: REPAIR the circuit in question. No : GO to 4 .
4. CHECK THE AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER Ignition OFF. Disconnect: Auxiliary Temperature Blend Door Actuator. Measure: HVAC Module HVAC Module C228B C228B Pin Circuit Measurement / Action Pin Circuit 28 CH245 (BU/BN) 27 CH244 (GY) Is the resistance greater than 10, 000 ohms? Yes: GO to 13 . No : REPAIR the circuit.
5. CHECK THE AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR MOTOR CIRCUITS FOR AN OPEN Ignition OFF. Disconnect: HVAC Module C228B. Disconnect: Auxiliary Temperature Blend Door Actuator. Measure: HVAC Module Auxiliary Temperature Blend Door Actuator C228B C3004 Pin Circuit Measurement / Action Pin Circuit 28 CH245 (BU/BN) 6 CH245 (BU/BN) 27 CH244 (GY) 5 CH244 (GY) Are the resistances less than 3 ohms? Yes: GO to 13 . No : REPAIR the circuit in question.
6. CHECK THE AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND Ignition OFF. Disconnect: HVAC Module C228B. Disconnect: Auxiliary Temperature Blend Door Actuator. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 7 VHA09 (VT/BN) - Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 7 . No : REPAIR the circuit.
7. CHECK THE SIGNAL RETURN CIRCUIT FOR A SHORT TO THE AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR FEEDBACK CIRCUIT Measure: HVAC Module HVAC Module C228A C228B Pin Circuit Measurement / Action Pin Circuit 23 RH111 (GY/BU) 7 VHA09 (VT/BN) Is the resistance greater than 10, 000 ohms? Yes: GO to 13 . No : REPAIR the circuits.
8. CHECK THE AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: HVAC Module C228A. Disconnect: HVAC Module C228B. Disconnect: Auxiliary Temperature Blend Door Actuator. Ignition ON. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 7 VHA09 (VT/BN) - Ground Is any voltage present? Yes: REPAIR the circuit. No : GO to 9 .
9. CHECK THE REFERENCE VOLTAGE CIRCUIT FOR AN OPEN Ignition OFF. Measure: HVAC Module Auxiliary Temperature Blend Door Actuator C228A C3004 Pin Circuit Measurement / Action Pin Circuit 24 LH111 (BN/WH) 3 LH111 (BN/WH) Is the resistance less than 3 ohms? Yes: GO to 10 . No : REPAIR the circuit.
10. CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO THE AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR FEEDBACK CIRCUIT Ignition OFF. Measure: HVAC Module HVAC Module C228A C228B Pin Circuit Measurement / Action Pin Circuit 24 LH111 (BN/WH) 7 VHA09 (VT/BN) Is the resistance greater than 10, 000 ohms? Yes: GO to 11 . No : REPAIR the circuits.
11. CHECK THE AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR FEEDBACK CIRCUIT FOR AN OPEN Measure: HVAC Module Auxiliary Temperature Blend Door Actuator C228B C3004 Pin Circuit Measurement / Action Pin Circuit 7 VHA09 (VT/BN) 2 VHA09 (VT/BN) Is the resistance less than 3 ohms? Yes: GO to 12 . No : REPAIR the circuit.
12. CHECK THE AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR RETURN SIGNAL RETURN CIRCUIT FOR AN OPEN Measure: HVAC Module Auxiliary Temperature Blend Door Actuator C228A C3004 Pin Circuit Measurement / Action Pin Circuit 23 RH111 (GY/BU) 1 RH111 (GY/BU) Is the resistance less than 3 ohms? Yes: GO to 13 . No : REPAIR the circuit.
13. CHECK FOR CORRECT AUXILIARY TEMPERATURE BLEND DOOR ACTUATOR OPERATION Disconnect and inspect the auxiliary temperature blend door actuator connector. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the auxiliary temperature blend door actuator connector. Make sure they seat and latch correctly. Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes: INSTALL a new Auxiliary Temperature Blend Door Actuator; REFER to «Auxiliary Temperature Blend Door Actuator»(ref-517583-S21325552342012121200000) . If the concern is still present, GO to 14 . No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
14. MODULE ACTUATOR POSITION CALIBRATION NOTE: The purpose of the module actuator position calibration is to allow the HVAC module to reinitialize and calibrate the actuator stop points. Ignition OFF. Disconnect and inspect all HVAC module connectors. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Clear the DTCs . Using a scan tool, perform HVAC Module self-test. Select any position except OFF NOTE: The HVAC module initializes and calibrates the actuators. Calibration of the actuators will take approximately 30 seconds. Operate the system and verify the concern is still present. Is the concern still present? Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. For EMTC, REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - EMTC»(ref-517582-S02745705852012121200000) or «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - DATC»(ref-517581-S13895863382012121200000) No : The system is now operating correctly at this time. The concern may have been caused by a foreign object in the HVAC case or temporary binding that restricted actuator door travel. CHECK any actuator external linkage. If condition recurs, INSPECT actuator linkage and door for binding and CHECK HVAC case for foreign objects.

Note. The auxiliary mode door actuator connector in the pinpoint test is difficult to access. Before disconnecting the temperature blend door actuator, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.

1. CHECK THE HVAC MODULE FOR DTCs Ignition ON. Using a scan tool, perform a HVAC module self-test. Are any DTCs present? Yes: For DTC B11E4:11, GO to 2 . For DTC B11E4:12, GO to 3 . For DTC B11E4:13, GO to 5 . For DTC B1B7D:11, GO to 6 . For DTC B1B7D:15, GO to 8 . No : GO to 2 .
2. CHECK THE AUXILIARY MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND Ignition OFF. Disconnect: auxiliary mode door actuator. Disconnect: HVAC Module C228B. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 26 CH243 (YE/GY) - Ground 25 CH242 (WH/BU) - Ground Are the resistances greater than 10, 000 ohms? Yes: GO to 4 . No : REPAIR the circuit in question.
3. CHECK THE AUXILIARY MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: auxiliary mode door actuator. Disconnect: HVAC Module C228B. Ignition ON. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 26 CH243 (YE/GY) - Ground 25 CH242 (WH/BU) - Ground Is any voltage present? Yes: REPAIR the circuit in question. No : GO to 4 .
4. CHECK THE AUXILIARY MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER Ignition OFF. Disconnect: Auxiliary Mode Door Actuator. Measure: HVAC Module HVAC Module C228A C228A Pin Circuit Measurement / Action Pin Circuit 26 CH243 (GY/BU) 25 CH242 (VT/RD) Is the resistance greater than 10, 000 ohms? Yes: GO to 13 . No : REPAIR the circuits.
5. CHECK THE AUXILIARY MODE DOOR ACTUATOR MOTOR CIRCUITS FOR AN OPEN Ignition OFF. Disconnect: HVAC Module C228B. Disconnect: Auxiliary Mode Door Actuator. Measure: HVAC Module Auxiliary Mode Door Actuator C228B C3044 Pin Circuit Measurement / Action Pin Circuit 26 CH243 (YE/GY) 6 CH243 (YE/GY) 25 CH242 (WH/BU) 5 CH242 (WH/BU) Are the resistances less than 3 ohms? Yes: GO to 13 . No : REPAIR the circuit in question.
6. CHECK THE AUXILIARY MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND Ignition OFF. Disconnect: HVAC Module C228B. Disconnect: Auxiliary Mode Door Actuator. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 8 VHA18 (YE/GY) - Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 7 . No : REPAIR the circuit.
7. CHECK THE SIGNAL RETURN CIRCUIT FOR A SHORT TO THE AUXILIARY MODE DOOR ACTUATOR FEEDBACK CIRCUIT Measure: HVAC Module HVAC Module C228B C228A Pin Circuit Measurement / Action Pin Circuit 8 VHA18 (YE/GY) 23 RH111 (GY/BU) Is the resistance greater than 10, 000 ohms? Yes: GO to 13 . No : REPAIR the circuits.
8. CHECK THE AUXILIARY MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: Auxiliary Mode Door Actuator. Disconnect: HVAC Module C228A. Ignition ON. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 8 VHA18 (YE/GY) - Ground Is any voltage present? Yes: REPAIR the circuit. No : GO to 9 .
9. CHECK THE REFERENCE VOLTAGE CIRCUIT FOR AN OPEN Ignition OFF Measure: HVAC Module Auxiliary Mode Door Actuator C228A C3044 Pin Circuit Measurement / Action Pin Circuit 24 LH111 (BN/WH) 3 LH111 (BN/WH) Is the resistance less than 3 ohms? Yes: GO to 10 . No : REPAIR the circuit.
10. CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO THE AUXILIARY MODE DOOR ACTUATOR FEEDBACK CIRCUIT Ignition OFF. Measure: HVAC Module HVAC Module C228A C228B Pin Circuit Measurement / Action Pin Circuit 21 VH436 (YE/VT) 8 LH111 (BN/WH) Is the resistance greater than 10, 000 ohms? Yes: GO to 11 . No : REPAIR the circuits.
11. CHECK THE AUXILIARY MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR AN OPEN Measure: HVAC Module Auxiliary Mode Door Actuator C228B C3044 Pin Circuit Measurement / Action Pin Circuit 8 VHA18 (YE/GY) 2 VHA18 (YE/GY) Is the resistance less than 3 ohms? Yes: GO to 12 . No : REPAIR the circuit.
12. CHECK THE AUXILIARY MODE DOOR ACTUATOR RETURN CIRCUIT FOR AN OPEN Measure: HVAC Module Auxiliary Mode Door Actuator C228A C3044 Pin Circuit Measurement / Action Pin Circuit 23 RH111 (GY/BU) 1 RH111 (GY/BU) Is the resistance less than 3 ohms? Yes: GO to 13 . No : REPAIR the circuit.
13. CHECK FOR CORRECT AUXILIARY MODE DOOR ACTUATOR OPERATION Ignition OFF. Disconnect and inspect the auxiliary mode door actuator connector. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the auxiliary mode door actuator connector. Make sure it seats and latches correctly. Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Clear the DTCs . Operate the system and determine if the concern is still present. Is the concern still present? Yes: INSTALL a new Auxiliary Mode Door Actuator; REFER to «Auxiliary Mode Door Actuator»(ref-517583-S33020944552012121200000) . If the concern is still present, GO to 14 . No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
14. MODULE ACTUATOR POSITION CALIBRATION NOTE: The purpose of the module actuator position calibration is to allow the HVAC module to reinitialize and calibrate the actuator stop points. Ignition OFF. Disconnect and inspect all HVAC module connectors. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Ignition ON. Clear the DTCs . Using a scan tool, perform HVAC Module self-test. Select any position except OFF. NOTE: The HVAC module initializes and calibrates the actuators. Calibration of the actuators takes approximately 30 seconds. Operate the system and determine if the concern is still present. Is the concern still present? Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. For EMTC, REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - EMTC»(ref-517582-S02745705852012121200000) or «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - DATC»(ref-517581-S13895863382012121200000) . No : The system is now operating correctly at this time. The concern may have been caused by a foreign object in the HVAC case or temporary binding that restricted actuator door travel. CHECK any actuator external linkage. If condition recurs, INSPECT actuator linkage and door for binding and CHECK HVAC case for foreign objects.

1. CHECK THE CIRCUIT BETWEEN THE HVAC MODULE AND THE AUXILIARY CLIMATE CONTROL ASSEMBLY FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: Auxiliary Climate Control Assembly. Disconnect: HVAC Module C228B. Ignition ON. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 24 VHA38 (VT/GN) - Ground 14 VHA39 (BN/BU) - Ground 5 VHA25 (BN/VT) - Ground 11 CHA37 (WH) - Ground 10 CHA36 (GY/BN) - Ground 9 CHA35 (BU/BN) - Ground Is voltage present on any of the circuits? Yes: REPAIR the circuit in question. No : GO to 2 .
2. CHECK THE CIRCUIT BETWEEN THE HVAC MODULE AND THE AUXILIARY CLIMATE CONTROL ASSEMBLY FOR A SHORT TO GROUND Ignition OFF. Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 24 VHA38 (VT/GN) - Ground 14 VHA39 (BN/BU) - Ground 5 VHA25 (BN/VT) - Ground 11 CHA37 (WH) - Ground 10 CHA36 (GY/BN) - Ground 9 CHA35 (BU/BN) - Ground Are the resistances greater than 10, 000 ohms? Yes: GO to 3 . No : REPAIR the circuit in question.
3. CHECK THE CIRCUIT BETWEEN THE HVAC MODULE AND THE AUXILIARY CLIMATE CONTROL ASSEMBLY FOR AN OPEN Disconnect: HVAC Module C228B. Measure: HVAC Module Auxiliary Climate Control Assembly C228B C3198 Pin Circuit Measurement / Action Pin Circuit 24 VHA38 (VT/GN) 2 VHA25 (BN/VT) 14 VHA39 (BN/BU) 3 VHA25 (BN/VT) 5 VHA25 (BN/VT) 4 VHA25 (BN/VT) 11 CHA37 (WH) 6 VHA25 (BN/VT) 10 CHA36 (GY/BN) 7 VHA25 (BN/VT) 9 CHA35 (BU/BN) 8 VHA25 (BN/VT) HVAC Module Auxiliary Climate Control Assembly C228A C3198 Pin Circuit Measurement / Action Pin Circuit 24 LH111 (BN/WH) 5 LH111 (BN/WH) 23 RH111 (GY/BU) 1 RH111 (GY/BU) Are the resistances less than 3 ohms? Yes: INSTALL a new auxiliary climate control assembly. REFER to «Auxiliary Climate Control Assembly»(ref-517583-S14820296742012121200000) . TEST the system for normal operation. If the condition returns, GO to 4 . No : REPAIR the circuit in question.
4. CHECK FOR CORRECT HVAC MODULE OPERATION Ignition OFF. Disconnect and inspect all HVAC module connectors. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. For EMTC, REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - EMTC»(ref-517582-S02745705852012121200000) or «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - DATC»(ref-517581-S13895863382012121200000) . No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

1. CHECK FOR HVAC MODULE DTCs Using a scan tool, perform HVAC module self-test. Are any HVAC DTCs present? Yes: For EMTC system, REFER to «DTC CHART: HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - EMTC»(ref-517582-S27097970942012121200000) . For DATC system, REFER to «DTC CHART: HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) MODULE - DATC»(ref-517581-S20334473502012121200000) No : GO to 2 .
2. CHECK THE AUXILIARY BLOWER MOTOR OPERATION FROM THE FRONT AND REAR CONTROLS Using the front and rear auxiliary blower motor controls, observe blower motor operation and select each auxiliary blower motor speed. Does the auxiliary blower motor operate the same from the front and rear controls? Yes: GO to 3 . No : If the auxiliary blower motor is inoperative from the rear controls, REFER to «Diagnostic Routine E: The Auxiliary Temperature, Mode, and Blower Motor Controls Are Inoperative Or Do Not Operate Correctly Using the Rear Auxiliary Controls Only»(ref-517583-S22967335982012121200000) . If the auxiliary blower motor is inoperative from the front controls: For EMTC systems , if all other auxiliary controls operate correctly using the front controls, INSTALL a new FCIM. REFER to «FRONT CONTROLS INTERFACE MODULE (FCIM)»(ref-538889-S40961126222013033000000) . If no other auxiliary controls operate from the front controls, INSTALL a new HVAC module. REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - EMTC»(ref-517582-S02745705852012121200000) . For DATC systems , if there is no other touch screen concerns in the screen area, INSTALL a new HVAC module. REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - DATC»(ref-517581-S13895863382012121200000) . If there are other touch screen concerns in the screen area, REFER to «PINPOINT TEST V: THE TOUCHSCREEN IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY»(ref-538890-S21894921712013033000000) (Premium Plus) or REFER to «PINPOINT TEST W: THE TOUCHSCREEN IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY»(ref-538891-S15500278972013033000000) (Sony® Sound).
3. CHECK THE AUXILIARY BLOWER MOTOR OPERATION Using the front and rear auxiliary blower motor controls, observe blower motor operation and select each auxiliary blower motor speed. Does the auxiliary blower motor operate correctly? Yes: GO to 4 . No : If the auxiliary blower motor is inoperative, REFER to «Diagnostic Routine A: The Auxiliary Blower Motor Is Inoperative»(ref-517583-S31280045062012121200000) . If the blower motor is always on or not all speeds operate correctly, REFER to «Diagnostic Routine B: The Auxiliary Blower Motor Does Not Operate Correctly»(ref-517583-S09666154662012121200000) .
4. CHECK AUXILIARY TEMPERATURE CONTROL OPERATION FROM THE FRONT AND REAR CONTROLS Start the vehicle and allow it to reach normal operating temperature. With the A/C on. Using the front and rear auxiliary controls, change the temperature setting from the coldest to the warmest and back to the coldest. Does the temperature blend door operate the same between the front and rear controls? Yes: GO to 5 . No : If the auxiliary temperature blend door is inoperative from the rear controls, REFER to «Diagnostic Routine E: The Auxiliary Temperature, Mode, and Blower Motor Controls Are Inoperative Or Do Not Operate Correctly Using the Rear Auxiliary Controls Only»(ref-517583-S22967335982012121200000) . If the auxiliary temperature blend door is inoperative from the front controls: For EMTC systems , if all other auxiliary controls operate correctly using the front controls, INSTALL a new FCIM. REFER to «FRONT CONTROLS INTERFACE MODULE (FCIM)»(ref-538889-S40961126222013033000000) . If no other auxiliary controls operate from the front controls, INSTALL a new HVAC module. REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - EMTC»(ref-517582-S02745705852012121200000) . For DATC systems , if there is no other touch screen concerns in the screen area, INSTALL a new HVAC module. REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - DATC»(ref-517581-S13895863382012121200000) . If there are other touch screen concerns in the screen area, REFER to «PINPOINT TEST V: THE TOUCHSCREEN IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY»(ref-538890-S21894921712013033000000) (Premium Plus) or REFER to «PINPOINT TEST W: THE TOUCHSCREEN IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY»(ref-538891-S15500278972013033000000) (Sony® Sound).
5. VERIFY AUXILIARY TEMPERATURE CONTROL OPERATION With the A/C on. Change the temperature setting from the coldest to the warmest and back to the coldest. Does the temperature blend door operate the same between the front and rear controls? Yes: GO to 6 . No : If the temperature does not get significantly warmer, REFER to «DIAGNOSTIC ROUTINE L»(ref-517581-S25046781652012121200000) : Insufficient, Erratic, or No Heat for DATC and REFER to «DIAGNOSTIC ROUTINE J»(ref-517581-S29853171562012121200000) : Insufficient, Erratic or No Heat for EMTC. If the temperature does not get significantly cooler, REFER to «REFRIGERANT SYSTEM TESTS»(ref-517581-S24027418502012121200000) . For all others, REFER to «Diagnostic Routine C: The Auxiliary Temperature Control is Inoperative or Does Not Operate Correctly Using The Front Or Rear Auxiliary Controls»(ref-517583-S41262724492012121200000) .
6. CHECK AUXILIARY MODE DOOR OPERATION FROM THE FRONT AND REAR CONTROLS Select the highest auxiliary blower motor setting. Using the front and rear auxiliary controls, change the mode setting from panel to floor and back to panel. Does the auxiliary mode door actuator operate the same from the front and rear controls? Yes: GO to 7 . No : If the auxiliary mode door actuator is inoperative from the rear controls, REFER to «Diagnostic Routine E: The Auxiliary Temperature, Mode, and Blower Motor Controls Are Inoperative Or Do Not Operate Correctly Using the Rear Auxiliary Controls Only»(ref-517583-S22967335982012121200000) . If the auxiliary mode door actuator is inoperative from the front controls: For EMTC systems , if all other auxiliary controls operate correctly using the front controls, INSTALL a new FCIM. REFER to «FRONT CONTROLS INTERFACE MODULE (FCIM)»(ref-538889-S40961126222013033000000) . If no other auxiliary controls operate from the front controls, INSTALL a new HVAC module. REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - EMTC»(ref-517582-S02745705852012121200000) . For DATC systems , if there is no other touch screen concerns in the screen area, INSTALL a new HVAC module. REFER to «HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - DATC»(ref-517581-S13895863382012121200000) . If there are other touch screen concerns in the screen area, REFER to «PINPOINT TEST V: THE TOUCHSCREEN IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY»(ref-538890-S21894921712013033000000) (Premium Plus) or REFER to «PINPOINT TEST W: THE TOUCHSCREEN IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY»(ref-538891-S15500278972013033000000) (Sony® Sound).
7. VERIFY AUXILIARY MODE DOOR OPERATION Select the highest auxiliary blower motor setting. Change the mode setting from panel to floor and back to panel. Does the auxiliary airflow change to the floor when floor selected and the headliner when panel selected? Yes: The system is operating normally. No : REFER to «Diagnostic Routine D: The Auxiliary Mode Control Is Inoperative or Does Not Operate Correctly Using The Front or Rear Auxiliary Controls»(ref-517583-S39658879422012121200000) .

Component Test

1. Perform the component test.

Scheme 9

1. Perform the component test.

Scheme 10