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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control System - General Information (2 Of 2) >> Diagnosis And Testing >> Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) >> Pinpoint Tests >> Pinpoint Test N: The Front Blower Motor Is Inoperative

Pinpoint Test N: The Front Blower Motor Is Inoperative

  1. Refer to Wiring Diagrams AUTOMATIC CLIMATE CONTROL SYSTEM for schematic and connector information.

    Normal Operation and Fault Conditions 

    Air Handling, REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    HVAC B10AF:11 Blower Fan Relay: Circuit Short To Ground Module senses low voltage on the relay coil voltage circuit when the module is energizing the circuit. Blower relay is permanently inactive.
    HVAC B10AF:15 Blower Fan Relay: Circuit Short To Battery Or Open Module senses greater than expected voltage on the blower relay coil voltage circuit, indicating an open circuit or a short to voltage. The blower motor relay is inactive when circuit is open; the blower motor relay is on all the time when shorted to battery.
    HVAC B10B9:12 Blower Control: Circuit Short To Battery Module senses high voltage on the blower motor control PWM circuit, indicating a short directly to voltage. The blower motor is inoperative.
    HVAC B10B9:14 Blower Control: Circuit Short To Ground Or Open Module senses no voltage on the blower motor control PWM circuit, indicating a short directly to ground or an open circuit. The blower motor runs at full speed if the circuit is shorted to ground. The blower motor is inoperative if the circuit is open

    Possible Sources 

    • Fuse
    • Wiring, terminals or connectors
    • Blower motor relay (non-serviceable, part of the BJB)
    • Blower motor
    • Blower motor control module
    • HVAC control module

    Visual Inspection and Pre-checks 

    • Make sure BJB fuse 89 (40A) is OK.

  2. NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

  3. N1 CHECK THE BLOWER MOTOR RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect BJB C1035A.

    • Disconnect HVAC control module C228B.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035A-1
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  N2
    No  REPAIR the circuit.

  4. N2 CHECK THE BLOWER MOTOR RELAY COIL CONTROL CIRCUIT FOR AN OPEN

    NOTE: Some vehicles may be equipped with a diode in the blower motor relay coil ground circuit. Make sure the multimeter leads are correctly attached during testing or a false reading will occur causing misdiagnosis of the circuit. For additional information, refer to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION .

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035A-1
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C228B-18

    Is the resistance less than 3 ohms? 

    Yes  GO to  N3
    No  REPAIR the circuit.

  5. N3 CHECK THE BLOWER MOTOR CONTROL MODULE VOLTAGE CIRCUIT FOR AN OPEN

    • Disconnect BJB C1035B.

    • Disconnect Blower motor control module C297A.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035B-4
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C297A-4

    Is the resistance less than 3 ohms? 

    Yes  GO to  N4
    No  REPAIR the circuit.

  6. N4 CHECK FOR VOLTAGE TO THE BLOWER MOTOR CONTROL MODULE

    • Connect BJB C1035A.

    • Connect BJB C1035B.

    • Connect HVAC control module C228B.

    • Ignition ON.

    • Select PANEL on the HVAC controls.

    • Select the highest blower motor setting.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C297A-4
      GFD572855Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  N5
    No  VERIFY BJB fuse 89 (40A) is OK.If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.If OK, INSTALL a new BJB.

  7. N5 CHECK THE BLOWER MOTOR CONTROL MODULE GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C297A-2
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  N6
    No  REPAIR the circuit.

  8. N6 CHECK THE BLOWER MOTOR CONTROL MODULE PWM (PULSE WIDTH MODULATION) CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect HVAC control module C228B.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C297A-3
      GFD572855Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  N7

  9. N7 CHECK THE BLOWER MOTOR CONTROL MODULE PWM (PULSE WIDTH MODULATION) CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C297A-3
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C228B-5

    Is the resistance less than 3 ohms? 

    Yes  GO to  N8
    No  REPAIR the circuit.

  10. N8 CHECK THE OUTPUTS TO THE BLOWER MOTOR

    • Disconnect Blower motor C2004.

    • Connect Blower motor control module C297A.

    • Connect HVAC control module C228B.

    • Ignition ON.

    • Select PANEL on the HVAC controls.

    • Select the highest blower motor setting.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2004-1
      GFD572855Courtesy of FORD MOTOR COMPANY
      		 C2004-2

    Is the voltage greater than 11 volts? 

    Yes  INSTALL a new blower motor.
    No  GO to  N9

  11. N9 CHECK THE CIRCUITS TO THE BLOWER MOTOR FOR AN OPEN

    • Ignition OFF.

    • Disconnect Blower motor speed control C297B.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C297B-1
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C2004-1
      C297B-2
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C2004-2

    Are the resistances less than 3 ohms? 

    Yes  GO to  N10
    No  REPAIR the circuit in question.

  12. N10 CHECK THE BLOWER MOTOR CIRCUITS FOR A SHORT TOGETHER

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2004-1
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C2004-2

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  N11
    No  REPAIR the circuits.

  13. N11 CHECK FOR CORRECT BLOWER MOTOR CONTROL MODULE OPERATION

    • Ignition OFF.

    • Disconnect and inspect all the blower motor speed control connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the blower motor speed control connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  INSTALL a new blower motor control module. Refer to the appropriate procedure in REMOVAL AND INSTALLATION . TEST the system for normal operation. If the concern is still present, GO to  N12
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  14. N12 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

    • Ignition OFF.

    • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

    • Repair:

      • corrosion (install new connector or terminal - clean module pins)
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary

    • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module. REFER to the appropriate REMOVAL AND INSTALLATION .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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