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PINPOINT TEST C: DTCs C1B14:11 AND 12

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK THE SENSOR RESISTANCE 
    • Check for HVAC DTCs.
    • Is DTC C1B14:11 present? 
    • Yes:  GO to C2  .
    • No:  GO to  C4.
  2. C2 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: HVAC Module C2356A  .
    • Disconnect: HVAC Module C2356B  .
    • Measure the resistance between ground and HVAC module C2356A-11, circuit LH111 (BN/WH), harness side.
      Fig 1: Measuring Resistance Between HVAC Module C2356A-11 And Ground
      G06064523Courtesy 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 CIRCUITS LH111 (BN/WH) AND RH111 (GY/BU) FOR A SHORT TOGETHER 
    • Measure the resistance between HVAC module C2356A-11, circuit LH111 (BN/WH), harness side and HVAC module C2356A-10, circuit RH111 (GY/BU), harness side.
      Fig 2: Measuring Resistance Between HVAC Module C2356A-11, Circuit LH111 (BN/WH) Harness Side And HVAC Module
      G06064524Courtesy 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 CIRCUIT LH111 (BN/WH) FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: HVAC Module C2356A  .
    • Disconnect: HVAC Module C2356B  .
    • Ignition ON.
    • Measure the voltage between ground and HVAC module C2356A-11, circuit LH111 (BN/WH), harness side.
      Fig 3: Measuring Voltage Between HVAC Module C2356A-11 And Ground
      G06064525Courtesy 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 MODULE CONNECTION 
    • Inspect the 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 HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE . 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.
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