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PINPOINT TEST D: DTCs B1A61:11 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. D1 CHECK THE SENSOR RESISTANCE 
    • Ignition OFF.
    • Disconnect: In-Vehicle Temperature/Humidity Sensor C2247  .
    • Measure the resistance between in-vehicle temperature/humidity sensor C2247 terminals 1 and 3.
      Fig 1: Measuring Resistance Between In-Vehicle Temperature Sensor Terminals 1 And 3 (Navigator Only)
      G06098687Courtesy of FORD MOTOR CO.
    • Is the resistance within the specified values for these temperature ranges: 10-20°C (50-68°F), 37,000-58,000 ohms; 20-30°C (68-86°F), 24,000-37,000 ohms; 30-40°C (86-104°F), 16,000-24,000 ohms? 
    • Yes:  GO to D2  .
    • No:  INSTALL a new in-vehicle temperature/humidity sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. D2 CHECK THE SENSOR OUTPUT VOLTAGE 
    • Ignition ON.
    • Measure the voltage between in-vehicle temperature/humidity sensor C2247- 1, circuit VH414 (GN/BU), harness side and C2247-3, circuit RH111 (GY/BU), harness side.
      Fig 2: Measuring Voltage Between In-Vehicle Temperature/Humidity Sensor C2247- 1 And C2247-3 (Navigator Only)
      G06098688Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.7 and 5.1 volts? 
    • Yes:  INSTALL a new in-vehicle temperature/humidity sensor. CLEAR the DTCs. REPEAT the self-test. If code returns, GO to  D8.
    • No: For DTC B1A61:15  , GO to D3  .

      For DTC B1A61:11  , GO to  D6.

  3. D3 CHECK CIRCUIT VH414 (GN/BU) 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 C2356B-21, circuit VH414 (GN/BU), harness side.
      Fig 3: Measuring Voltage Between HVAC Module C2356B-21 And Ground
      G06075210Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR circuit VH414 (GN/BU) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No:  GO to D4  .
  4. D4 CHECK CIRCUIT VH414 (GN/BU) FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between HVAC module C2356B-21, circuit VH414 (GN/BU), harness side and in-vehicle temperature sensor C2247-1, circuit VH414 (GN/BU), harness side.
      Fig 4: Checking Circuit VH414 (GN/BU) For An Open
      G06394413Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to D5  .
    • No:  REPAIR circuit VH414 (GN/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. D5 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN 
    • Measure the resistance between HVAC module C2356A-10, circuit RH111 (GY/BU), harness side and in-vehicle temperature sensor C2247-3, circuit RH111 (GY/BU), harness side.
      Fig 5: Checking Circuit RH111 (GY/BU) For An Open
      G06098690Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  D8.
    • No:  REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. D6 CHECK CIRCUIT VH414 (GN/BU) FOR A SHORT TO CIRCUIT RH111 (GY/BU) 
    • Ignition OFF.
    • Disconnect: HVAC Module C2356B.
    • Measure the resistance between in-vehicle temperature sensor C2247-1, circuit VH414 (GN/BU), harness side and C2247-3, circuit RH111 (GY/BU), harness side.
      Fig 6: Measuring Resistance Between In-Vehicle Temperature Sensor C2247-1 And C2247-3 (Navigator Only)
      G06098691Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to D7  .
    • No:  REPAIR circuit VH414 (GN/BU) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  7. D7 CHECK CIRCUIT VH414 (GN/BU) FOR A SHORT TO GROUND 
    • Measure the resistance between HVAC module C2356B-21, circuit VH414 (GN/BU), harness side and ground.
      Fig 7: Measuring Resistance Between HVAC Module C2356B-21 And Ground
      G06075214Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to D8  .
    • No:  REPAIR circuit VH414 (GN/BU) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  8. D8 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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