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Pinpoint Test N : The Brake Warning Indicator Is Always On

  1. Instrument Cluster for schematic and connector information.

    Normal Operation and Fault Conditions 

    See Brake Warning Indicator, ABS/Brake/Stability-Traction Control System Indication and Brake Fluid Level Switch. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

    If the brake fluid level warning, brake (red) warning indicator request or parking brake warning indicator request messages are missing or invalid for less than 5 seconds, the IPC defaults the brake warning indicator to the last indication mode (on/off) based upon the last message received.

    If the brake fluid level warning, brake (red) warning indicator request or parking brake warning indicator request messages are missing or invalid for 5 seconds or longer, the IPC defaults the brake warning indicator on.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    BCM B1048:01 Brake Fluid Level Switch: General Electrical Failure A continuous and on-demand DTC that sets in the BCM when the BCM detects an open on the brake fluid level switch input.
    BCM B1048:7B Brake Fluid Level Switch: Low Fluid Level A continuous and on-demand DTC that sets in the BCM when the BCM detects low brake fluid level.
    BCM C1D00:11 Park Brake Apply Switch: Circuit Short To Ground A continuous and on-demand DTC that sets in the BCM when the BCM detects the parking brake applied or a short to ground on the parking brake input.

    Possible Sources 

    • Wiring, terminals or connectors
    • Brake fluid level switch
    • Parking brake system concern
    • Communication concern
    • ABS
    • GWM
    • BCM
    • IPC

    Visual Inspection and Pre-checks 

    • Inspect the base brake system and the parking brake system for correct operation.
    • Inspect the brake fluid level switch connection and check for signs of connector terminal damage, corrosion or pushed-out pins.
    • Inspect the brake fluid level switch wiring for signs of a cut or opened circuit.
    • Inspect the brake fluid level switch for signs of any external damage.

  2. N1 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • Ignition ON.

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to DTC Chart: IPC 
    No  GO to  N2

  3. N2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE BCM (BODY CONTROL MODULE) SELF-TEST

    • Using a diagnostic scan tool, perform the BCM self-test.

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  For DTC B1048:01, GO to  N6 For DTC B1048:7B, VERIFY the brake fluid level is low. If the brake fluid is low, CORRECT the low brake fluid condition. REFER to HYDRAULIC BRAKE ACTUATION If the brake fluid is not low, INSTALL a new brake fluid level switch. For DTC C1D00:11, GO to  N7 For all other Diagnostic Trouble Codes (DTCs), REFER to: Body Control Module (BCM) .
    No  GO to  N3

  4. N3 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (CMDTCs).

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Communications Network .
    No  GO to  N4

  5. N4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST

    • Using a diagnostic scan tool, perform the ABS module self-test.

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Anti-Lock Brake System (ABS) and Stability Control .
    No  GO to  N5

  6. N5 CHECK THE PARKING BRAKE OPERATION

    • Check the parking brake operation while applying and releasing the parking brakes using the switch.

    Do the parking brakes apply when switched on and release when switched off? 

    Yes  Refer to IPC Guided Routine .
    No  DIAGNOSE the parking brake system. REFER to PARKING BRAKE

  7. N6 CHECK THE BRAKE FLUID LEVEL SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect BCM C2280E.

    • Ignition ON.

    • Measure:
      Lead 1 Measurement / Action Lead 2
      Refer to C2280E-34
      GFD355366Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  N7

  8. N7 CHECK THE BRAKE FLUID LEVEL SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect BCM C2280E.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C2280E-34
      GFD355367Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  N8
    No  GO to  N11

  9. N8 CHECK THE BRAKE FLUID LEVEL SWITCH INPUT CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Brake Fluid Level Switch C124.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C2280E-34
      GFD355367Courtesy of FORD MOTOR COMPANY
      		 Refer to C124-2

    Is the resistance less than 3 ohms? 

    Yes  GO to  N9
    No  REPAIR the circuit.

  10. N9 CHECK THE BRAKE FLUID LEVEL SWITCH GROUND CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C124-1
      GFD355367Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  N10
    No  REPAIR the circuit.

  11. N10 CHECK THE BRAKE FLUID LEVEL SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND WITH THE BRAKE FLUID LEVEL SWITCH DISCONNECTED

    • Measure:
      Lead 1 Measurement / Action Lead 2
      Refer to C2280E-34
      GFD355367Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  INSTALL a new brake fluid level switch.
    No  REPAIR the circuit.

  12. N11 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all BCM 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

    • Reconnect the BCM 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, Refer to BCM Guided Routine .
    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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