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Pinpoint Test M : The Brake Warning Indicator Is Always On

  1. NOTE: The ABS warning indicator, stability-traction control indicator (sliding car icon), stability-traction control disabled (sliding car OFF icon) and the brake warning indicator illuminate if the input to illuminate the brake warning indicator is sent by the ABS module.

    Refer to Instrument Cluster for schematic and connector information.

    Normal Operation and Fault Conditions 

    If the BCM doesn't receive the brake (red) warning indicator request from the ABS module, the BCM sets DTC U0121:00

    If the brake fluid level low, brake (red) warning request or parking brake warning indicator request messages are missing or invalid for less than the programmed time threshold, the IPC sets DTC U0140:00 and defaults the brake warning indicator to the last indication mode (on/off) based upon the last message received.

    If the brake warning request message is missing from the BCM for more than a programmed length of time or longer, the BCM and the IPC set DTC U0121:00 and defaults the brake warning indicator on.

    If the parking brake warning request or brake fluid level low message are missing from the BCM for the programmed time or longer, the IPC sets DTC U0140:00 and defaults the brake warning indicator on.

    See Brake Warning Indicator, Parking Brake Position Switch and Brake Fluid Level Switch. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    BCM B1048:13 Brake Fluid Level Switch: Circuit Open 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 B1048:1E Brake Fluid Level Switch: Circuit Resistance Out Of Range A continuous and on-demand DTC that sets in the BCM when the BCM detects an out of range 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 C1D00:00 Park Brake Apply Switch: No Sub Type Information 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 position switch
    • ABS concern
    • BCM
    • IPC

    Visual Inspection and Pre-checks 

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

  2. M1 CARRY OUT THE IPC (INSTRUMENT PANEL CLUSTER) INDICATOR LAMP CONTROL ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL

    • Ignition ON.

    • Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).

    • Select the IPC the brake warning indicator (PBA_LAMP) PID.

    • Command the brake warning indicator on then off while observing the brake warning indicator.

    Does the brake warning indicator illuminate when commanded on and turn off when commanded off? 

    Yes  GO to  M2
    No  Refer to IPC Guided Routine Testing .

  3. M2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • 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  M3

  4. M3 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 B1048:13, GO to  M7 For DTC B1048:1E, INSTALL a new brake fluid reservoir. REFER to: the appropriate Service Information. For DTC B1048:7B, GO to  M10 For all other Diagnostic Trouble Codes (DTCs), REFER to: Body Control Module (BCM) .
    No  GO to  M4

  5. M4 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  M5

  6. M5 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  M6

  7. M6 CHECK THE PARKING BRAKE POSITION SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect BCM C2280C.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280C-54
      GFD311333Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  M12
    No  REPAIR the circuit.

  8. M7 CHECK THE BRAKE FLUID LEVEL SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect BCM C2280C.

    • Ignition ON.

    • Measure:
      Lead 1 Measurement / Action Lead 2
      C2280C-23
      GFD311131Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  M8

  9. M8 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
      C2280C-23
      GFD311333Courtesy of FORD MOTOR COMPANY
      		 C124-2

    Is the resistance less than 3 ohms? 

    Yes  GO to  M9
    No  REPAIR the circuit.

  10. M9 CHECK THE BRAKE FLUID LEVEL GROUND CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C124-1
      GFD311333Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new brake fluid reservoir. REFER to: the appropriate Service Information.
    No  REPAIR the circuit.

  11. M10 CHECK THE BRAKE FLUID LEVEL SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect BCM C2280C.

    • Measure:
      Lead 1 Measurement / Action Lead 2
      C2280C-23
      GFD311333Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  M11
    No  GO to  M12

  12. M11 CHECK THE BRAKE FLUID LEVEL SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND WITH THE BRAKE FLUID LEVEL SWITCH DISCONNECTED

    • Disconnect Brake Fluid Level Switch C124.

    • Measure:
      Lead 1 Measurement / Action Lead 2
      C2280C-23
      GFD311333Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  INSTALL a new brake fluid reservoir. REFER to: the appropriate Service Information.
    No  REPAIR the circuit.

  13. M12 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 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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