LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2021 >> Bronco Base, 2D Utility, 2.3L Eng VIN H, Part Time T/Case Control, Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> MULTIFUNCTION Electronic Modules >> Diagnosis And Testing >> Auxiliary Switches >> Pinpoint Tests >> Pinpoint Test B: An UPFITTER Switch Relay Controlled Component Is Inoperative
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Pinpoint Test B: An UPFITTER Switch Relay Controlled Component Is Inoperative

  1. Refer to Power Distribution/BCM for schematic and connector information. Refer to Customer Access for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Module Controlled Functions - System Operation and Component Description 

    Possible Sources 

    • Wiring, terminals or connectors
    • BCMC fuses
    • Upfitter switch
    • BCMC

    Visual Inspection and Pre-checks 

    • BCM Fuse 2 (10A)
    • Relay 1 Fuse 60 (25A)
    • Relay 2 Fuse 61 (15A)
    • Relay 3 Fuse 62 (10A)
    • Relay 4 Fuse 63 (5A)
    • Relay 5 Fuse 64 (5A)
    • Relay 6 Fuse 65 (5A)

  2. NOTE: For accurate diagnostics of customer (upfitter) installed devices, it will be necessary to refer to the upfitter literature for additional information.
  3. NOTE: To install the upfitter switches on a vehicle that was not originally equipped from the factory and additional information, refer to the Owner's Literature and www.fleet.ford.com for truck body builder advisory service bulletins.

  4. B1 CHECK THE UPFITTER SWITCHES

    • Ignition ON.

    • Operate all the upfitter switches.

    Are all the upfitter switches inoperative? 

    Yes  GO to Pinpoint Test A 
    No  GO to  B2

  5. B2 CHECK THE UPFITTER RELAY CONTROL CIRCUITS

    NOTE: The upfitter relays are internal to the BCMC and are non-serviceable.

    • Ignition OFF.

    • Disconnect BCMC C1035A.

    • Disconnect BCMC C1035B.

    • Disconnect BCMC C1035C.

    • Place the upfitter switch in question to the ON position.

    • Ignition ON.

    • Measure:

      Upfitter relay 1 

      Positive Lead Measurement / Action Negative Lead
      C1035B-35
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground

      Upfitter relay 2 

      Positive Lead Measurement / Action Negative Lead
      C1035B-20
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground

      Upfitter relay 3 

      Positive Lead Measurement / Action Negative Lead
      C1035B-24
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground

      Upfitter relay 4 

      Positive Lead Measurement / Action Negative Lead
      C1035C-21
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground

      Upfitter relay 5 

      Positive Lead Measurement / Action Negative Lead
      C1035A-40
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground

      Upfitter relay 6 

      Positive Lead Measurement / Action Negative Lead
      C1035B-38
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  B5
    No  GO to  B3

  6. B3 CHECK THE UPFITTER RELAY CONTROL CIRCUITS FOR AN OPEN

    • Disconnect Upfitter Switch C9120.

    • Measure:

      Upfitter relay 1 

      Positive Lead Measurement / Action Negative Lead
      C9120-2
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 C1035B-35

      Upfitter relay 2 

      Positive Lead Measurement / Action Negative Lead
      C9120-3
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 C1035B-20

      Upfitter relay 3 

      Positive Lead Measurement / Action Negative Lead
      C9120-4
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 C1035B-24

      Upfitter relay 4 

      Positive Lead Measurement / Action Negative Lead
      C9120-10
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 C1035C-21

      Upfitter relay 5 

      Positive Lead Measurement / Action Negative Lead
      C9120-8
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 C1035A-40

      Upfitter relay 6 

      Positive Lead Measurement / Action Negative Lead
      C9120-7
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 C1035B-38

    Is the resistance less than 1 ohm? 

    Yes  GO to  B4
    No  REPAIR the circuit in question.

  7. B4 CHECK THE UPFITTER RELAY CONTROL CIRCUITS FOR A SHORT TO GROUND

    • Measure:

      Upfitter relay 1 

      Positive Lead Measurement / Action Negative Lead
      C9120-2
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 Ground

      Upfitter relay 2 

      Positive Lead Measurement / Action Negative Lead
      C9120-3
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 Ground

      Upfitter relay 3 

      Positive Lead Measurement / Action Negative Lead
      C9120-4
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 Ground

      Upfitter relay 4 

      Positive Lead Measurement / Action Negative Lead
      C9120-10
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 Ground

      Upfitter relay 5 

      Positive Lead Measurement / Action Negative Lead
      C9120-8
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 Ground

      Upfitter relay 6 

      Positive Lead Measurement / Action Negative Lead
      C9120-7
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  B5
    No  REPAIR the circuit in question.

  8. B5 CHECK THE UPFITTER RELAY CONTROL GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035A-6
      GFD623861Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  B6
    No  INSPECT ground 100. INSPECT and REPAIR the circuit. If the circuit is good, GO to  B7

  9. B6 CHECK FOR VOLTAGE AT THE BCMC (BODY CONTROL MODULE C) FUSES

    NOTE: The upfitter relays are internal to the BCMC and are non-serviceable.

    • REMOVE and INSPECT each relay fuse for an open.

    • If the fuse is open, REFER to the customer access wiring schematics to locate the faulty circuit.

    • Ignition ON.

    • If the fuse is good, turn the auxiliary switch for the circuit in question on.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Upfitter Relay 1 Fuse 60 (25A)
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground
      Upfitter Relay 2 Fuse 61 (15A)
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground
      Upfitter Relay 3 Fuse 62 (10A)
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground
      Upfitter Relay 4 Fuse 63 (5A)
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground
      Upfitter Relay 5 Fuse 64 (5A)
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground
      Upfitter Relay 6 Fuse 65 (5A)
      GFD623860Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  REFER to the customer access wiring schematics to locate the faulty circuit.
    No  GO to  B7

  10. B7 CHECK FOR CORRECT BCMC (BODY CONTROL MODULE C) OPERATION

    • Disconnect and inspect all BCMC 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

    • Connect the BCMC 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 BCMC. REFER to: Body Control Module C (BCMC) 
    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.
scientia non olet · About LEMON Manuals