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Pinpoint Test P : The Brake Warning Indicator Is Always On

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  1. Instrument Cluster for schematic and connector information.

    Normal Operation and Fault Conditions 

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

    If the brake (red) warning indicator request or the brake indicator request messages are missing 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 An on-demand DTC that sets in the BCM if the BCM detects a low brake fluid level input from the brake fluid level switch.
    BCM C1D00:11 Park Brake Apply Switch: Circuit Short To Ground An on-demand DTC that sets in the BCM if the BCM detects a short to ground on the parking brake input.

    Possible Sources 

    • Communication concern
    • Wiring, terminals or connectors
    • Brake fluid level switch
    • Parking brake position switch
    • ABS concern
    • GWM concern
    • 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. P1 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: Instrument Panel Cluster (IPC) 
    No  GO to  P2

  3. P2 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  P7 For DTC B1048:7B, VERIFY the brake fluid level is low. If the brake fluid level is low, CORRECT the low brake fluid condition. REFER to: Hydraulic Brake Actuation . If the brake fluid level is not low, INSTALL a new brake fluid level switch or reservoir as necessary. For DTC C1D00:11, GO to  P5 For all other Diagnostic Trouble Codes (DTCs), REFER to: Body Control Module (BCM) .
    No  GO to  P3

  4. P3 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 
    No  GO to  P4

  5. P4 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) . or REFER to: Anti-Lock Brake System (ABS) and Stability Control .
    No  INSTALL a new IPC. REFER to: Instrument Panel Cluster (IPC) .

  6. P5 CHECK THE PARKING BRAKE POSITION SWITCH

    • Ignition OFF.

    • Disconnect Parking Brake Position Switch C306.

    • Ignition ON.

    • Using a diagnostic scan tool, view the BCM parking brake position switch Parameter Identifications (PIDs).

    • Monitor the parking brake PID (PARK_BRK_SW) with the parking brake released.

    Does the PID indicate the parking brake is released? 

    Yes  INSTALL a new parking brake position switch.
    No  GO to  P6

  7. P6 CHECK THE PARKING BRAKE POSITION SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect BCM C2280F.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C2280F-30
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  P11
    No  REPAIR the circuit.

  8. P7 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
      GFD328094Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  P8

  9. P8 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
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Refer to C124-2

    Is the resistance less than 3 ohms? 

    Yes  GO to  P9
    No  REPAIR the circuit.

  10. P9 CHECK THE BRAKE FLUID LEVEL GROUND CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C124-1
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  P10
    No  REPAIR the circuit.

  11. P10 CHECK THE BRAKE FLUID LEVEL SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C2280E-34
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new brake fluid level switch or reservoir as required.
    No  GO to  P11

  12. P11 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the BCM and all related in-line 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 and all related in-line 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) 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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