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Pinpoint Test A: GFM2 (Generic Function Module 2) Controlled Systems Are Inoperable

  1. NOTE: Except for GFM2 power, ground and HS-CAN, all wiring is provided by an upfitter. REFER to upfitter documentation for wiring and system operation.

    Refer to OEM WIRING DIAGRAMS COMPONENT TESTING for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Generic Function Module 2 (GFM2) .

    Possible Sources 

    • Wiring, terminals or connectors
    • Fuse(s(
    • Auxiliary relays
    • Auxiliary devices
    • GFM2

    Visual Inspection and Pre-checks 

    • Verify AJB fuse F47 (10A).
    • Inspect the GFM2 for loose or corroded connections.

  2. A1 CHECK FOR CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCS) SET IN OTHER MODULES

    • Ignition ON.

    • Connect the diagnostic tool.

    • Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).

    Are any charging system DTCs recorded? 

    Yes  DIAGNOSE the charging system concern. Refer to BATTERY CHARGING .
    No  GO to  A2

  3. A2 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

    Is the battery OK and fully charged? 

    Yes  GO to  A3
    No  If the battery is discharged, DIAGNOSE the cause of the low battery condition. Refer to BATTERY DISCONNECT AND CONNECT - VEHICLES WITH: SINGLE BATTERY .If the battery condition fails, INSTALL a new battery. REFER to: Battery - Vehicles With: Dual Batteries .

  4. A3 CHECK GFM2 (GENERIC FUNCTION MODULE 2) POWER

    • Ignition OFF.

    • Disconnect GFM2 C290A

    • Ignition ON.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      GFD787807Courtesy of FORD MOTOR COMPANY
      GFD786456Courtesy of FORD MOTOR COMPANY
      GFD787808Courtesy of FORD MOTOR COMPANY

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C290A Pin 1
      GFD786456Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage within 0.5 volt of the recorded battery voltage? 

    Yes  GO to  A4
    No  VERIFY AJB fuse F471 (10A) 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 to ground.

  5. A4 CHECK GFM2 (GENERIC FUNCTION MODULE 2) GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C290A Pin 4
      GFD786457Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new GFM2. REFER to Generic Function Module 2 (GFM2) .
    No  REPAIR the circuit.
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