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Pinpoint Test U: The Hill Descent Control Feature Is Inoperative

  1. Normal Operation and Fault Conditions 

    The hill descent control switch is part of the instrument panel console switch assembly and is hardwired to the IPC. When the hill descent control switch is pressed, the IPC receives a ground signal and sends a message to the GWM over the MS-CAN. The GWM relays the message to the ABS module over the HS-CAN2. If the ABS module does not receive any messages within a certain time frame (usually less than 1 second) or if the message contains invalid information, the ABS module sets a DTC.

    Possible Sources 

    • Wiring, terminals or connectors.
    • Instrument panel switch assembly
    • Network concern
    • IPC

  2. U1 CHECK THE IPC COMMUNICATIONS

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the IPC self-test.

    • Retrieve and record all IPC Diagnostic Trouble Codes (DTCs).

    Does the IPC communicate with the diagnostic scan tool? 

    Yes  GO to  U2
    No  DIAGNOSE the IPC does not communicate with the diagnostic scan tool. REFER to: COMMUNICATIONS NETWORK .

  3. U2 CHECK THE IPC DIAGNOSTIC TROUBLE CODES (DTCS)

    • Review the results from the previous step.

    Are there any Diagnostic Trouble Codes (DTCs) present and active in the IPC? 

    Yes  DIAGNOSE all IPC Diagnostic Trouble Codes (DTCs). REFER to: INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES .
    No  GO to  U3

  4. U3 CHECK THE INSTRUMENT PANEL CONSOLE SWITCH GROUND CIRCUIT FOR AN OPEN

    • Disconnect IPC C220.

    • Disconnect Instrument panel console switch assembly C3010.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3010-12
      GFD586004Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  U4
    No  REPAIR the circuit.

  5. U4 CHECK THE HILL DESCENT CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3010-2
      GFD586268Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit for a short to voltage. CLEAR any Diagnostic Trouble Codes (DTCs) from the IPC.
    No  GO to  U5

  6. U5 CHECK THE HILL DESCENT CONTROL CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3010-2
      GFD586004Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  U6
    No  REPAIR the circuit.

  7. U6 CHECK THE HILL DESCENT CONTROL CIRCUIT FOR AN OPEN CIRCUIT

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3010-2
      GFD586004Courtesy of FORD MOTOR COMPANY
      		 C220-7

    Is the resistance less than 3 ohms? 

    Yes  REPAIR the circuit.
    No  INSTALL a new instrument panel console switch assembly.
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