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PINPOINT TEST C: DTCs C1B14:11 AND 12

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  1. C1 CHECK THE HVAC MODULE DTCs 
    • Ignition ON.
    • Check for HVAC module DTCs.
    • Is DTC C1B14:11 present? 
    • Yes  : GO to C2.
    • No  : GO to  C4.
  2. C2 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: HVAC Module C228.
    • Measure the resistance between ground and HVAC module C228-24, circuit LH111 (BN/WH), harness side.
      Fig 1: Measuring Resistance Between Ground And HVAC Module C228-24, Circuit LH111 (BN/WH), Harness Side
      G07484433Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to C3.
    • No  : REPAIR circuit LH111 (BN/WH) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  3. C3 CHECK THE REFERENCE VOLTAGE CIRCUIT AND THE SIGNAL RETURN CIRCUIT FOR A SHORT TOGETHER 
    • Measure the resistance between HVAC module C228-24, circuit LH111 (BN/WH), harness side and HVAC module C228-23, circuit RH111 (GY/BU), harness side.
      Fig 2: Measuring Resistance Between HVAC Module C228-24, Circuit LH111 (BN/WH) And HVAC Module C228-23, Circuit RH111 (GY/BU)
      G07484434Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 200 ohms? 
    • Yes  : GO to C5.
    • No  : REPAIR circuits LH111 (BN/WH) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. C4 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: HVAC Module C228.
    • Ignition ON.
    • Measure the voltage between ground and HVAC module C228-24, circuit LH111 (BN/WH), harness side
      Fig 3: Measuring Voltage Between Ground And HVAC Module C228-24, Circuit LH111 (BN/WH), Harness Side
      G07484435Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR circuit LH111 (BN/WH) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No  : GO to C5.
  5. C5 CHECK THE HVAC MODULE CONNECTION 
    • Inspect the HVAC module connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the HVAC module connectors.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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