LEMON Manuals: Even more car manuals for everyone
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 W: The Rear Blower Motor Is Inoperative

Pinpoint Test W: The Rear Blower Motor Is Inoperative

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

    Normal Operation and Fault Conditions 

    Rear blower motor. REFER to: Rear Climate Control - System Operation and Component Description .

    Possible Sources 

    • Wiring, terminals or connectors
    • Fuse
    • Rear blower motor relay (non-serviceable, part of BJB)
    • Rear blower motor
    • Rear blower motor control module
    • RHVAC control module

    Visual Inspection and Pre-checks 

    • Make sure BJB fuse 40 (40A) and BCM fuse 2 (5A) are 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. W1 CHECK THE REAR BLOWER MOTOR OPERATION

    • Ignition ON.

    • On the RHVAC controls, select each rear blower motor speed position.

    Does the rear blower motor operate in any position? 

    Yes  GO to Pinpoint Test X 
    No  GO to  W2

  4. W2 CHECK THE REAR BLOWER MOTOR RELAY COIL GROUND CIRCUIT

    • Ignition OFF.

    • Disconnect BJB C1035A.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035A-4
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  W3
    No  REPAIR the circuit.

  5. W3 CHECK THE REAR BLOWER MOTOR RELAY COIL IGNITION VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Disconnect BCM C2280D.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035A-12
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C2280D-70

    Is the resistance less than 3 ohms? 

    Yes  GO to  W4
    No  REPAIR the circuit.VERIFY BCM fuse 2 (5A) is OK.If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

  6. W4 CHECK THE REAR BLOWER MOTOR CONTROL MODULE GROUND CIRCUIT

    • Disconnect rear blower motor control module C3448A.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3448A-2
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  W5
    No  REPAIR the circuit.

  7. W5 CHECK THE REAR BLOWER MOTOR CONTROL MODULE SUPPLY VOLTAGE CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035A-25
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C3448A-4

    Is the resistance less than 3 ohms? 

    Yes  GO to  W6
    No  REPAIR the circuit.

  8. W6 CHECK THE REAR BLOWER MOTOR CONTROL MODULE FOR SUPPLY VOLTAGE

    • Connect BJB C1035A.

    • Connect BCM C2280D.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3448A-4
      GFD572855Courtesy of FORD MOTOR COMPANY
      		 C3448A-2

    Is the voltage greater than 11 volts? 

    Yes  GO to  W7
    No  VERIFY BJB fuse 40 (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.

  9. W7 CHECK THE PWM (PULSE WIDTH MODULATION) CIRCUIT BETWEEN THE RHVAC (REAR HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE AND THE REAR BLOWER MOTOR CONTROL MODULE FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect RHVAC control module C3198.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3448A-3
      GFD572855Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  W8

  10. W8 CHECK THE PWM (PULSE WIDTH MODULATION) CIRCUIT BETWEEN THE RHVAC (REAR HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE AND THE REAR BLOWER MOTOR CONTROL MODULE FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3448A-3
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  W9
    No  REPAIR the circuit.

  11. W9 CHECK THE PWM (PULSE WIDTH MODULATION) CIRCUIT BETWEEN THE RHVAC (REAR HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE AND THE REAR BLOWER MOTOR CONTROL MODULE FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3448A-3
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C3198-1

    Is the resistance less than 3 ohms? 

    Yes  GO to  W10
    No  REPAIR the circuit.

  12. W10 CHECK FOR REAR BLOWER MOTOR FUNCTIONALITY WITH A TEST LIGHT IN PLACE OF THE REAR BLOWER MOTOR

    NOTE: The following pinpoint test step uses a test lamp to simulate normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or equivalent 250-300mA incandescent bulb test lamp. To avoid connector terminal damage, use the Rotunda Flex Probe kit for the test lamp probe connection to the vehicle. Do not use the test lamp probe directly on any connector.

    • Reconnect all disconnected connectors. Make sure they seat and latch correctly.

    • Disconnect rear blower motor C3447.

    • Connect:
      Positive Lead Measurement / Action Negative Lead
      C3447-1
      GFD572857Courtesy of FORD MOTOR COMPANY
      		 C3447-2

    • Ignition ON.

    • On the RHVAC controls, select the highest blower speed position.

    Does the test lamp illuminate? 

    Yes  INSTALL a new rear blower motor. Refer to the appropriate procedure in REAR BLOWER MOTOR .
    No  GO to  W11

  13. W11 CHECK THE REAR BLOWER MOTOR CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect rear blower motor control module C3448B.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3447-1
      GFD572855Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3447-2
      GFD572855Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit in question.
    No  GO to  W12

  14. W12 CHECK THE REAR BLOWER MOTOR CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3447-1
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3447-2
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  W13
    No  REPAIR the circuit in question.

  15. W13 CHECK THE REAR BLOWER MOTOR CIRCUITS FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3447-1
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C3448B-1
      C3447-2
      GFD572856Courtesy of FORD MOTOR COMPANY
      		 C3448B-2

    Are the resistances less than 3 ohms? 

    Yes  CONNECT the rear blower motor. GO to  W14
    No  REPAIR the circuit in question.

  16. W14 CHECK FOR CORRECT REAR BLOWER CONTROL MODULE OPERATION

    • Disconnect and inspect all rear blower control module electrical connectors.

    • 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 rear blower 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 rear blower motor control module. Refer to the appropriate procedure in REAR CLIMATE CONTROL . TEST the system for normal operation. If the concern is still present, GO to  W15
    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.

  17. W15 CHECK FOR CORRECT RHVAC (REAR HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

    • Disconnect and inspect RHVAC control module electrical connector.

    • 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 RHVAC control module electrical connector. Make sure it seats and latches 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 RHVAC control module. REFER to the appropriate procedure in REAR CLIMATE CONTROL .
    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.
scientia non olet · About LEMON Manuals