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PINPOINT TEST H: DTCs B1B71:11 AND 15

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. H1 CHECK THE SENSOR RESISTANCE 
    • Ignition OFF.
    • Disconnect: Evaporator Discharge Air Temperature Sensor C296.
    • Allow enough time for the evaporator to stabilize to the outside ambient temperature.
    • Measure the resistance between evaporator discharge air temperature sensor C296 terminals and compare to the table below.
      RESISTANCE REFERENCE CHART

      Ambient Temperature Resistance
      -40°C (-40°F) 832,591-1,017,523 ohms
      -20°C (-4°F) 263,111-290,807 ohms
      0°C (32°F) 91,058-100,644 ohms
      20°C (68°F) 35,473-39,207 ohms
      25°C (77°F) 28,500-31,500 ohms
      40°C (104°F) 15,307-16,919 ohms
      60°C (140°F) 7,171-7,925 ohms
      100°C (212°F) 1,976-2,184 ohms
      120°C (248°F) 1,131-1,251 ohms
      Fig 1: Measuring Resistance Between Evaporator Temperature Sensor C296 Terminals
      G06064669Courtesy of FORD MOTOR CO.
    • Is the resistance within the specified values for the temperatures? 
    • Yes:  GO to H2  .
    • No:  INSTALL a new evaporator discharge air temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. H2 CHECK THE HVAC OUTPUT VOLTAGE 
    • Ignition ON.
    • Press the power button.
    • Measure the voltage between evaporator discharge air temperature sensor C296-1, circuit VH406 (VT/BN), harness side and C296-2, circuit RH111 (GY/BU), harness side.
      Fig 2: Measuring Voltage Between Evaporator Temperature Sensor C296-1 And C296-2
      G06064548Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.7 and 5.1 volts? 
    • Yes:  INSTALL a new evaporator discharge air temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If code returns, GO to  H7.
    • No: For DTC B1B71:15  , GO to H3  .

      For DTC B1B71:11  , GO to  H5.

  3. H3 CHECK CIRCUIT VH406 (VT/BN) FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: HVAC Module C2356A.
    • Measure the resistance between HVAC module C2356A-6, circuit VH406 (VT/BN), harness side and evaporator discharge air temperature sensor C296- 1, circuit VH406 (VT/BN), harness side.
      Fig 3: Checking Circuit VH406 (VT/BN) For An Open
      G06098565Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to H4  .
    • No:  REPAIR circuit VH406 (VT/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. H4 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN 
    • Measure the resistance between HVAC module C2356A-10, circuit RH111 (GY/BU), harness side and evaporator discharge air temperature sensor C296-2, circuit RH111 (GY/BU), harness side.
      Fig 4: Checking Circuit RH111 (GY/BU) For An Open
      G06098566Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  H7.
    • No:  REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. H5 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO CIRCUIT RH111 (GY/BU) 
    • Ignition OFF.
    • Disconnect: HVAC Module C2356A.
    • Measure the resistance between evaporator discharge air temperature sensor C296-1, circuit VH406 (VT/BN), harness side and C296-2, circuit RH111 (GY/BU), harness side.
      Fig 5: Measuring Resistance Between In-Vehicle Temperature Sensor C296-1 And C296-2
      G06064531Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to H6  .
    • No:  REPAIR circuit VH406 (VT/BN) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. H6 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO GROUND 
    • Measure the resistance between HVAC module C2356A-6, circuit VH406 (VT/BN), harness side and ground.
      Fig 6: Measuring Resistance Between HVAC Module C2356A-6 And Ground
      G06064553Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to H7  .
    • No:  REPAIR circuit VH406 (VT/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  7. H7 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 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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