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Pinpoint Test V : The GFM (Generic Function Module) (Remote Cd Module) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2020 Ford Transit Connect. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to Module Communications Network for schematic and connector information.

    Normal Operation and Fault Conditions 

    The GFM communicates on the HS-CAN3. REFER to: Communications Network - System Operation and Component Description .

    Possible Sources 

    • Fuse
    • Wiring, terminals and connector
    • GFM

    Visual Inspection and Pre-checks 

    • Verify BCM fuse 17 (15A) is OK.

  2. V1 CHECK THE GFM (GENERIC FUNCTION MODULE) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect: GFM C2611.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2611-1
      GFD455923Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  V2
    No  VERIFY the BCM fuse 17 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

  3. V2 CHECK THE GFM (GENERIC FUNCTION MODULE) GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2611-10
      GFD455922Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  V3
    No  REPAIR the circuit.

  4. V3 CHECK THE HS-CAN3 (HIGH-SPEED CONTROLLER AREA NETWORK 3) CIRCUITS BETWEEN THE GFM (GENERIC FUNCTION MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

    • Disconnect GWM C2431.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2611-6
      GFD455922Courtesy of FORD MOTOR COMPANY
      		 C2431-16
      C2611-7
      GFD455922Courtesy of FORD MOTOR COMPANY
      		 C2431-15

    Are the resistances less than 3 ohms? 

    Yes  CONNECT the GWM, GO to  V4
    No  REPAIR the circuit in question.

  5. V4 CHECK FOR CORRECT GFM (GENERIC FUNCTION MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the GFM connector.

    • 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 GFM 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, General Service Bulletin (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 GFM. Refer to the appropriate Information and Entertainment System article for the procedure.
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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