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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 2076 (Climate Control System - General Information & Diagnostics (Hybrid)) >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Pinpoint Test K: The Blower Motor is Inoperative

Pinpoint Test K: The Blower Motor is Inoperative

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

Refer to SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.



  1. K1 CHECK THE HVAC MODULE FOR DTCs 
    • Ignition ON.
    • Check the HVAC module for DTCs.
    • Are any DTCs present? 
    1. Yes  : For DTC B10AF:12  , REPAIR circuit CH123 (VT/GN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      For DTC B10AF:14  , CARRY OUT the Blower Motor Relay component test. Refer to ENGINE CONTROLS - COMPONENT TESTING -- FUSION HYBRID, MILAN HYBRID & MKZ HYBRID article for component testing. If the relay tests OK, GO to K2.

      For DTC B10B9:14  , GO to  K4.

      For DTC B10B9:12  , REPAIR circuit VH101 (VT/WH) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

    2. No  : GO to  K6.
  2. K2 CHECK THE RELAY COIL SUPPLY VOLTAGE 
    • Ignition OFF.
    • Disconnect: Blower Motor Relay.
    • Ignition ON.
    • Measure the voltage between blower motor relay socket pin 1, circuit CBP45 (YE) and ground.
      Fig 1: Measuring Voltage Between Blower Motor Relay Socket Pin 1, Circuit CBP45 (YE) And Ground
      G06262726Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to K3.
    2. No  : VERIFY Smart Junction Box (SJB) fuse 45 (5A) is OK. If OK, REPAIR circuit CBP45 (YE) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article, to identify the possible causes of the circuit short.
  3. K3 CHECK CIRCUIT CH123 (VT/GN) FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: HVAC Module - DATC C2356a.
    • Measure the resistance between blower motor relay socket pin 2, circuit CH123 (VT/GN) and HVAC module - DATC C2356a-24, circuit CH123 (VT/GN), harness side.
      Fig 2: Checking Circuit CH123 (VT/GN) For Open
      G07787316Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to  K17.
    2. No  : REPAIR circuit CH123 (VT/GN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. K4 CHECK CIRCUIT VH101 (WH/VT) FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: Blower Motor Speed Control C271.
    • Disconnect: HVAC Module - DATC C2356a.
    • Measure the resistance between blower motor control C271-B, circuit VH101 (WH/VT), harness side and HVAC module - DATC C2356a-14, circuit VH101 (WH/VT), harness side.
      Fig 3: Checking Circuit VH101 (WH/VT) For Open
      G06262728Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to K5.
    2. No  : REPAIR circuit VH101 (WH/VT) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. K5 CHECK CIRCUIT VH101 (WH/VT) FOR GROUND SIGNAL 
    • Connect: HVAC Module - DATC C2356a.
    • Ignition ON.
    • Press the PANEL button on the HVAC module. Adjust the blower motor setting to HI.
    • Measure the voltage between blower motor speed control C271-B, circuit VH101 (WH/VT), harness side and blower motor speed control C271-C, circuit CH402 (YE/GN), harness side.
      Fig 4: Measuring Voltage Between Blower Motor Speed Control C271-B, Circuit VH101 (WH/VT) And C271-C, Circuit CH402 (YE/GN)
      G06262618Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to  K16.
    2. No  : GO to  K17.
  6. K6 CHECK FOR VOLTAGE TO THE BLOWER MOTOR 
    • Ignition OFF.
    • Disconnect: Blower Motor C288.
    • Ignition ON.
    • Measure the voltage between blower motor C288-A, circuit VH219 (GY), harness side and blower motor C288-B, circuit VH301 (YE/BU), harness side.
      Fig 5: Measuring Voltage Between Blower Motor C288-A, Circuit VH219 (GY) And C288-B, Circuit VH301 (YE/BU)
      G06262619Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : INSTALL a new blower motor. TEST the system for normal operation.
    2. No  : GO to K7.
  7. K7 CHECK FOR VOLTAGE TO THE BLOWER MOTOR CONTROLLER 
    • Ignition OFF.
    • Disconnect: Blower Motor Speed Control C271.
    • Ignition ON.
    • Press the PANEL button on the HVAC module.
    • Measure the voltage between blower motor speed control C271-C, circuit CH402 (YE/GN), harness side and ground.
      Fig 6: Measuring Voltage Between Blower Motor Speed Control C271-C, Circuit CH402 (YE/GN) And Ground
      G06262620Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to K8.
    2. No  : GO to  K14.
  8. K8 CHECK CIRCUIT GD115 (BK/GY) FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between blower motor speed control C271-A, circuit GD115 (BK/GY), harness side and ground.
      Fig 7: Measuring Resistance Between Blower Motor Speed Control C271-A, Circuit GD115 (BK/GY) And Ground
      G06262621Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to K9.
    2. No  : REPAIR circuit GD115 (BK/GY) for an open. TEST the system for normal operation.
  9. K9 CHECK CIRCUIT VH101 (WH/VT) FOR GROUND SIGNAL 
    • Ignition ON.
    • Press the PANEL button on the HVAC module. Adjust the blower motor setting to HI.
    • Measure the voltage between blower motor speed control C271-B, circuit VH101 (WH/VT), harness side and blower motor speed control C271-C, circuit CH402 (YE/GN), harness side.
      Fig 8: Measuring Voltage Between Blower Motor Speed Control C271-B, Circuit VH101 (WH/VT) And C271-C, Circuit CH402 (YE/GN)
      G06262618Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to K10.
    2. No  : GO to  K17.
  10. K10 CHECK CIRCUITS VH219 (GY) AND VH301 (YE/BU) FOR AN OPEN 
    • Measure the resistance between the blower motor connector, harness side and blower motor speed control, harness side using the following chart.
      Blower Motor Connector Circuit Blower Motor Speed Control Connector
      C288-A VH219 (GY) C271-E
      C288-B VH301 (YE/BU) C271-D
      Fig 9: Checking Circuits VH219 (GY) And VH301 (YE/BU) For Open
      G06262623Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes  : GO to K11.
    2. No  : REPAIR circuit VH219 (GY) or VH301 (YE/BU) for an open. TEST the system for normal operation.
  11. K11 CHECK CIRCUITS VH219 (GY) AND VH301 (YE/BU) FOR A SHORT TOGETHER 
    • Measure the resistance between blower motor C288-A, circuit VH219 (GY), harness side and blower motor C288-B, circuit VH301 (YE/BU), harness side.
      Fig 10: Measuring Resistance Between Blower Motor C288-A, Circuit VH219 (GY) And Blower Motor C288-B, Circuit VH301 (YE/BU)
      G06262624Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to K12.
    2. No  : REPAIR circuits VH219 (GY) and VH301 (YE/BU) for a short together. TEST the system for normal operation.
  12. K12 CHECK CIRCUIT VH219 (GY) FOR A SHORT TO GROUND 
    • Measure the resistance between ground and blower motor C288-A, circuit VH219 (GY), harness side.
      Fig 11: Measuring Resistance Between Ground And Blower Motor C288-A, Circuit VH219 (GY)
      G06262625Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to K13.
    2. No  : REPAIR circuit VH219 (GY) for a short to ground. TEST the system for normal operation.
  13. K13 CHECK CIRCUIT VH301 (YE/BU) FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between ground and blower motor C288-B, circuit VH301 (YE/BU), harness side.
      Fig 12: Measuring Voltage Between Ground And Blower Motor C288-B, Circuit VH301 (YE/BU)
      G06262626Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR circuit VH301 (YE/BU) for a short to voltage. TEST the system for normal operation.
    2. No  : GO to  K16.
  14. K14 CHECK THE RELAY SWITCH POWER CIRCUIT FOR AN OPEN 
    • Measure the voltage between blower motor relay socket pin 3, circuit SBB35 (BU/RD) and ground.
      Fig 13: Measuring Voltage Between Blower Motor Relay Socket Pin 3, Circuit SBB35 (BU/RD) And Ground
      G07787327Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to K15.
    2. No  : VERIFY Battery Junction Box (BJB) fuse 35 (40A) is OK. If OK, REPAIR circuit SBB35 (BU/RD) for an open. TEST the system for normal operation. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article, to identify the possible causes of the circuit short.
  15. K15 CHECK THE MODULE OUTPUT 
    NOTE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools  table at the beginning of this service information or equivalent. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.
    • Ignition ON.
    • With the engine running, connect a 12-volt test lamp between blower motor relay socket pin 2, circuit CH123 (VT/GN) and socket pin 1, circuit CBP45 (YE).
      Fig 14: Checking Module Output Using A 12-Volt Test Lamp
      G06262739Courtesy of FORD MOTOR CO.
    • Does the test lamp illuminate? 
    1. Yes  : CARRY OUT the blower motor relay component test. Refer to ENGINE CONTROLS - COMPONENT TESTING -- FUSION HYBRID, MILAN HYBRID & MKZ HYBRID article for component testing. If the relay tests OK, REPAIR circuit CH402 (YE/GN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    2. No  : GO to  K17.
  16. K16 CHECK THE BLOWER MOTOR SPEED CONTROL CONNECTION 
    • Clear the DTCs.
    • Disconnect the blower motor speed control connector.
    • Check for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat the connector.
    • Carry out the HVAC On-Demand Self Test.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new blower motor speed control. REFER to CLIMATE CONTROL -- FUSION, MILAN & MKZ article. CLEAR the DTCs. TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. TEST the system for normal operation.
  17. K17 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? 
    1. Yes  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL -- FUSION, MILAN & MKZ article. TEST the system for normal operation.
    2. 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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