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Pinpoint Test N: The Brake Warning Indicator Is Always On

  1. Refer to 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  INSTALL a new IPC.Instrument Panel Cluster (IPC) 
    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
      C2280E-34
      GFD573125Courtesy 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
      C2280E-34
      GFD573124Courtesy 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
      C2280E-34
      GFD573124Courtesy of FORD MOTOR COMPANY
      		 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
      C124-1
      GFD573124Courtesy 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
      C2280E-34
      GFD573124Courtesy 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, INSTALL a new BCM. Refer to BODY CONTROL MODULE (BCM) .
    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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