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Home >> Ford >> 2012 >> Explorer Limited, 3.5 8, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Auxiliary Climate Control >> Diagnostic Routine(S) >> Diagnostic Routine C >> Pinpoint Test

Pinpoint Test

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.
  1. CHECK THE HVAC MODULE FOR DTCs 
    1. Ignition ON.
    2. 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
    1. Ignition OFF.
    2. Disconnect: Auxiliary Temperature Blend Door Actuator.
    3. Disconnect: HVAC Module C228B.
    4. Measure:
      HVAC Module Ground
      G08033680
      G08031601
      C228B Ground
      Pin Circuit Measurement / Action Pin Circuit
      28 CH245 (BU/BN)
      G08031553
      		 - Ground
      27 CH244 (GY)
      G08031553
      		 - 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
    1. Ignition OFF.
    2. Disconnect: Auxiliary Temperature Blend Door Actuator.
    3. Disconnect: HVAC Module C228B.
    4. Ignition ON.
    5. Measure:
      HVAC Module Ground
      G08033680
      G08031601
      C228B Ground
      Pin Circuit Measurement / Action Pin Circuit
      28 CH245 (BU/BN)
      G08033411
      		 - Ground
      27 CH244 (GY)
      G08033411
      		 - 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
    1. Ignition OFF.
    2. Disconnect: Auxiliary Temperature Blend Door Actuator.
    3. Measure:
      HVAC Module HVAC Module
      G08033680
      G08033680
      C228B C228B
      Pin Circuit Measurement / Action Pin Circuit
      28 CH245 (BU/BN)
      G08031553
      		 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
    1. Ignition OFF.
    2. Disconnect: HVAC Module C228B.
    3. Disconnect: Auxiliary Temperature Blend Door Actuator.
    4. Measure:
      HVAC Module Auxiliary Temperature Blend Door Actuator
      G08033680
      G08033877
      C228B C3004
      Pin Circuit Measurement / Action Pin Circuit
      28 CH245 (BU/BN)
      G08031553
      		 6 CH245 (BU/BN)
      27 CH244 (GY)
      G08031553
      		 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
    1. Ignition OFF.
    2. Disconnect: HVAC Module C228B.
    3. Disconnect: Auxiliary Temperature Blend Door Actuator.
    4. Measure:
      HVAC Module Ground
      G08033680
      G08031601
      C228B Ground
      Pin Circuit Measurement / Action Pin Circuit
      7 VHA09 (VT/BN)
      G08031553
      		 - 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
    1. Measure:
      HVAC Module HVAC Module
      G08033466
      G08033680
      C228A C228B
      Pin Circuit Measurement / Action Pin Circuit
      23 RH111 (GY/BU)
      G08031553
      		 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
    1. Ignition OFF.
    2. Disconnect: HVAC Module C228A.
    3. Disconnect: HVAC Module C228B.
    4. Disconnect: Auxiliary Temperature Blend Door Actuator.
    5. Ignition ON.
    6. Measure:
      HVAC Module Ground
      G08033680
      G08031601
      C228B Ground
      Pin Circuit Measurement / Action Pin Circuit
      7 VHA09 (VT/BN)
      G08033411
      		 - Ground

      Is any voltage present? 

      • Yes:  REPAIR the circuit.
      • No  : GO to 9  .
  9. CHECK THE REFERENCE VOLTAGE CIRCUIT FOR AN OPEN
    1. Ignition OFF.
    2. Measure:
      HVAC Module Auxiliary Temperature Blend Door Actuator
      G08033466
      G08033877
      C228A C3004
      Pin Circuit Measurement / Action Pin Circuit
      24 LH111 (BN/WH)
      G08031553
      		 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
    1. Ignition OFF.
    2. Measure:
      HVAC Module HVAC Module
      G08033466
      G08033680
      C228A C228B
      Pin Circuit Measurement / Action Pin Circuit
      24 LH111 (BN/WH)
      G08031553
      		 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
    1. Measure:
      HVAC Module Auxiliary Temperature Blend Door Actuator
      G08033680
      G08033877
      C228B C3004
      Pin Circuit Measurement / Action Pin Circuit
      7 VHA09 (VT/BN)
      G08031553
      		 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
    1. Measure:
      HVAC Module Auxiliary Temperature Blend Door Actuator
      G08033466
      G08033877
      C228A C3004
      Pin Circuit Measurement / Action Pin Circuit
      23 RH111 (GY/BU)
      G08031553
      		 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
    1. Disconnect and inspect the auxiliary temperature blend door actuator connector.
    2. 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
    3. Reconnect the auxiliary temperature blend door actuator connector. Make sure they seat and latch correctly.
    4. Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
    5. 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 . 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.
    1. Ignition OFF.
    2. Disconnect and inspect all HVAC module connectors.
    3. 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
    4. Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
    5. Clear the DTCs  .
    6. Using a scan tool, perform HVAC Module self-test.
    7. Select any position except OFF
    8. 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 or HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE - DATC
      • 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.
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