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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control - DATC >> Diagnostic Routine(S) >> Diagnostic Routine AI >> Pinpoint Test

Pinpoint Test

  1. CHECK FOR HVAC MODULE DTCs 
    1. Ignition ON.
    2. Using a scan tool, perform a HVAC module self-test.

    Are DTCs C1B14:11 or C1B14:12 present? 

  2. CHECK FOR VOLTAGE TO THE IN-VEHICLE TEMPERATURE SENSOR/HUMIDITY SENSOR
    1. Ignition OFF.
    2. Disconnect: In-Vehicle Temperature/Humidity Sensor.
    3. Ignition ON.
    4. Measure:
      In-Vehicle Temperature/Humidity Sensor Ground
      G08033283
      G08033284
      C233 Ground
      Pin Circuit Measurement / Action Pin Circuit
      2 LH111 (BN/WH)
      G08033285
      		 - Ground

    Is the voltage between 4.7 and 5 volts? 

    • Yes: For DTC B1A69:11, GO to 3  .

      For DTC B1A69:15, GO to  4.

    • No: REPAIR the circuit.
  3. CHECK THE HUMIDITY SIGNAL CIRCUIT FOR A SHORT TO GROUND
    1. Ignition OFF.
    2. Disconnect: HVAC Module C228A
    3. Measure:
      In-Vehicle Temperature/Humidity Sensor Ground
      G08033286
      G08033287
      C233 Ground
      Pin Circuit Measurement / Action Pin Circuit
      4 VH413 (WH/BU)
      G08033288
      		 - Ground

    Is the resistance greater than 10, 000 ohms? 

    • Yes: GO to  6.
    • No: REPAIR the circuit.
  4. CHECK THE HUMIDITY SIGNAL CIRCUIT FOR AN OPEN CIRCUIT
    1. Ignition OFF.
    2. Disconnect: HVAC Module C228B.
    3. Measure:
      In-Vehicle Temperature/Humidity Sensor HVAC Module
      G08033289
      G08033290
      C233 C228B
      Pin Circuit Measurement / Action Pin Circuit
      4 VH413 (WH/BU)
      G08033291
      		 18 VH413 (WH/BU)

    Is the resistance less than 3 ohms? 

    • Yes: GO to 5  .
    • No: REPAIR the circuit.
  5. CHECK THE HUMIDITY SIGNAL CIRCUIT FOR A SHORT TO POWER
    1. Ignition ON.
    2. Measure:
      In-Vehicle Temperature/Humidity Sensor Ground
      G08033293
      G08033292
      C233 Ground
      Pin Circuit Measurement / Action Pin Circuit
      4 VH413 (WH/BU)
      G08033294
      		 - Ground

    Is any voltage present? 

    • Yes: REPAIR the circuit.
    • No: GO to 6  .
  6. ISOLATE THE IN-VEHICLE TEMPERATURE SENSOR/HUMIDITY SENSOR
    1. Ignition OFF.
    2. Connect: HVAC Module C228A.
    3. Connect: HVAC Module C228B.
    4. Install a new in-vehicle temperature sensor/humidity sensor. REFER to In-Vehicle Temperature Sensor .
    5. Ignition ON.
    6. Using a scan tool, perform a HVAC module self-test.

    Does the DTC return? 

    • Yes: GO to 7  .
    • No: The cause of the concern was an inoperative in-vehicle temperature sensor/humidity sensor.
  7. CHECK FOR CORRECT HVAC MODULE OPERATION
    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. 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 .
    • 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.
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