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Pinpoint Test L: The Brake Warning Indicator Is Never/Always On

  1. L1 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE DIAGNOSTIC TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
    • Select the instrument cluster warning lamps and chime active command. Trigger the all lamps active command on and off. Observe the brake warning indicator.
    • Does the brake warning indicator illuminate when triggered on and turn off when triggered off? 
    • Yes  : GO to L2.
    • No  : GO to  L13.
  2. L2 CHECK THE PARKING BRAKE SWITCH PID 
    • Enter the following diagnostic mode on the diagnostic tool: Parking Brake Switch PID.
    • Monitor the instrument cluster parking brake switch PID while applying and releasing the parking brake.
    • Does the PID agree with the parking brake position? 
    • Yes  : GO to  L8.
    • No  : If the PID indicates that the parking brake is always applied, GO to L3.
    • If the PID indicates that the parking brake is always never applied, GO to  L5.
  3. L3 CHECK THE PARKING BRAKE SWITCH (INDICATOR ALWAYS ON) 
    • Disconnect: Parking Brake Switch C2015.
    • Observe the brake warning indicator.
    • Does the brake warning indicator continue to illuminate? 
    • Yes  : GO to L4.
    • No  : INSTALL a new parking brake switch. TEST the system for normal operation.
  4. L4 CHECK CIRCUIT 162 (LG/RD) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
    • Measure the resistance between the instrument cluster C220b pin 7, circuit 162 (LG/RD), harness side and ground.
      Fig 1: Measuring Resistance Between Instrument Cluster C220B Pin 7, Circuit 162 (LG/RD), Harness Side And Ground
      G03930706Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to  L13.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. L5 CHECK THE PARKING BRAKE SWITCH (INDICATOR INOPERATIVE) 
    • Disconnect: Parking Brake Switch C2015.
    • Connect a fused (5A) jumper wire between the parking brake switch C2015 pin 2, circuit 162 (LG/RD), harness side and the parking brake switch C2015 pin 1, circuit 57 (BK), harness side.
      Fig 2: Checking Parking Brake Switch (Indicator Inoperative)
      G03930707Courtesy of FORD MOTOR CO.
    • Does the brake warning indicator illuminate? 
    • Yes  : INSTALL a new parking brake switch. TEST the system for normal operation.
    • No  : REMOVE the jumper wire. GO to L6.
  6. L6 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the parking brake switch C2015 pin 1, circuit 57 (BK), harness side and ground.
      Fig 3: Measuring Resistance Between Parking Brake Switch C2015 Pin 1, Circuit 57 (Bk), Harness Side And Ground
      G03930708Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to L7.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  7. L7 CHECK CIRCUIT 162 (LG/RD) FOR AN OPEN 
    • Disconnect: Instrument Cluster C220b.
    • Measure the resistance between the instrument cluster C220b pin 7, circuit 162 (LG/RD), harness side and the parking brake switch C2015 pin 2, circuit 162 (LG/RD), harness side.
      Fig 4: Checking Circuit 162 (LG/RD) For Open
      G03930709Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  L13.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  8. L8 CHECK THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE OPERATION 
    • Key in OFF position.
    • Disconnect: Brake Fluid Level Switch C124.
    • Key in ON position.
    • Observe the brake warning indicator after the instrument cluster proves out.
    • Connect a fused (10A) jumper wire between the brake fluid level switch C124 pin 3, circuit 531 (DG/YE), harness side and the brake fluid level switch C124 pin 2, circuit 512 (TN/LG), harness side.
      Fig 5: Checking Anti-Lock Brake System (ABS) Module Operation
      G03930710Courtesy of FORD MOTOR CO.
    • Does the brake warning indicator illuminate with the brake fluid level switch disconnected and turn off when the jumper wire is in place? 
    • Yes  : REMOVE the jumper wire. GO to L9.
    • No  : REMOVE the jumper wire. GO to  L10.
  9. L9 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the brake fluid level switch C124 pin 1, circuit 57 (BK), harness side and ground.
      Fig 6: Measuring Resistance Between Brake Fluid Level Switch C124 Pin 1, Circuit 57 (BK), Harness Side And Ground
      G03910712Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new brake fluid level switch. REFER to HYDRAULIC BRAKE ACTUATION . TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  10. L10 CHECK CIRCUIT 531 (DG/YE) AND CIRCUIT 512 (TN/LG) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: ABS Module C135.
    • Measure the resistance between the ABS module C135 pin 8, circuit 512 (TN/LG), harness side and the brake fluid level switch C124 pin 2, circuit 512 (TN/LG), harness side; and between the ABS module C135 pin 9, circuit 531 (DG/YE), harness side and the brake fluid level switch C124 pin 3, circuit 531 (DG/YE), harness side.
      Fig 7: Checking Circuit 531 (DG/YE) And Circuit 512 (TN/LG) For Open
      G03930712Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to L11.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
  11. L11 CHECK CIRCUIT 531 (DG/YE) AND CIRCUIT 512 (TN/LG) FOR A SHORT TO GROUND 
    • Measure the resistance between the ABS module C135 pin 8, circuit 512 (TN/LG), harness side and ground; and between the ABS module C135 pin 9, circuit 531 (DG/YE), harness side and ground.
      Fig 8: Checking Circuit 531 (DG/YE) And Circuit 512 (TN/LG) For Short To Ground
      G03930713Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to L12.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
  12. L12 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect the ABS module connector.
    • Check for:
      • corrosion
      • pushed-out pins
    • Correct the ABS module connector and make sure it seats correctly.
    • Operate the system and verify that the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new ABS module. REFER to ANTI-LOCK CONTROL . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  13. L13 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify that the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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