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Home >> Ford >> 2012 >> Explorer Limited, 3.5 8, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 281 (Climate Control System - EMTC) >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Pinpoint Test C: C1B14:11, C1B14:12 >> Pinpoint Test C: C1B14:11, C1B14:12

Pinpoint Test C: C1B14:11, C1B14:12

WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK THE HVAC MODULE DTCs 
    • Ignition ON.
    • Review the recorded DTCs  from the HVAC  module self-test.

    Is DTC C1B14:11 present? 

    1. Yes  : GO to C2  .
    2. No  : GO to  C5.
  2. C2 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: HVAC  Module C228A.
    • Disconnect: HVAC  Module C228B.
    • Disconnect: Auxiliary Climate Control Assembly.
    • Measure:
      Positive Lead Measurement/Action Negative Lead
      C228A-24  OHM Ground

    Is the resistance greater than 10, 000 ohms? 

    1. Yes  : GO to C3  .
    2. No  : REPAIR the circuit.
  3. C3 CHECK THE REFERENCE VOLTAGE CIRCUIT AND THE SIGNAL RETURN CIRCUIT FOR A SHORT TOGETHER 
    • Connect: Auxiliary Climate Control Assembly.
    • Measure:
      Positive Lead Measurement/Action Negative Lead
      C228A-24  OHM C228A-23 

    Is the resistance greater than 200 ohms? 

    1. Yes  : GO to  C6.
    2. No  : GO to C4  .
  4. C4 CHECK THE ACTUATORS 
    • Measure:
      Positive Lead Measurement/Action Negative Lead
      C228A-24  OHM C228A-23 
    • While measuring the resistance, disconnect the components one at a time, in order. Stop disconnecting components if the measured resistance rises above 200 ohms:
      • Defrost/panel/floor door actuator
      • LH temperature blend door actuator
      • RH temperature blend door actuator
      • Recirculation door actuator
      • In-vehicle temperature/humidity sensor
      • Auxiliary mode door actuator
      • Auxiliary temperature blend door actuator
      • Auxiliary climate control assembly

    Did the resistance rise above 200 ohms? 

    1. Yes  : INSTALL a new component in question (the last one to be disconnected).
    2. No  : REPAIR the circuits.
  5. C5 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: HVAC  Module C228A.
    • Ignition ON.
    • Measure:
      Positive Lead Measurement/Action Negative Lead
      C228A-24  VOLTAGE Ground

    Is any voltage present? 

    1. Yes  : REPAIR the circuit.
    2. No  : GO to C6  .
  6. C6 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? 

    1. 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 .
    2. 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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