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

  1. K1 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE DIAGNOSTIC TOOL 
    • Key in OFF position.
    • Connect 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 indicator lamps active command 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  : If the brake warning indicator is never on, GO to  K2.

      If the brake warning indicator is always on, GO to  K8.

    • No  : GO to  K12.
  2. K2 CHECK THE PARKING BRAKE SWITCH 
    • Key in OFF position.
    • Disconnect: Parking Brake Switch C2015.
    • Measure the resistance between the parking brake switch C2015 pin 1, circuit 31S-GE44 (BK/RD), component side and ground while applying and releasing the parking brake.
      Fig 1: Checking Parking Brake Switch
      G03910707Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms with the parking brake applied, and greater than 10,000 ohms with the parking brake released? 
      • Yes  : GO to  K3.
      • No  : INSTALL a new parking brake switch. TEST the system for normal operation.
  3. K3 CHECK CIRCUIT 31S-GE44 (BK/RD) FOR AN OPEN 
    • Disconnect: Instrument Cluster C2220.
    • Measure the resistance between the instrument cluster C2220 pin 22, circuit 31S-GE44 (BK/RD), harness side and the parking brake switch C2015 pin 1, circuit 31S-GE44 (BK/RD), harness side.
      Fig 2: Checking Circuit 31S-GE44 (BK/RD) For An Open
      G03952222Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : GO to  K4.
      • No  : REPAIR the circuit. TEST the system for normal operation.
  4. K4 CHECK CIRCUIT 31S-GE44 (BK/RD) FOR A SHORT TO POWER 
    • Key in ON position.
    • Measure the voltage between the instrument cluster C2220 pin 22, circuit 31S-GE44 (BK/RD), harness side and ground.
      Fig 3: Measuring Voltage Between Instrument Cluster C2220 Pin 22, Circuit 31S-GE44 (BK/RD), Harness Side And Ground
      G03952223Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      • Yes  : REPAIR the circuit. TEST the system for normal operation.
      • No  : GO to  K5.
  5. K5 CHECK THE BRAKE FLUID LEVEL SWITCH 
    • Key in OFF position.
    • Disconnect: Brake Fluid Level Switch C124.
    • Connect: Instrument Cluster C2220.
    • Connect a fused (5A) jumper wire between the brake fluid level switch C124 pin 2, circuit 31S-GC6 (BK/YE), harness side and ground.
      Fig 4: Connecting Fused (5A) Jumper Wire Between Brake Fluid Level Switch C124 Pin 2, Circuit 31S-GC6 (BK/YE), Harness Side And Ground
      G03952224Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Does the brake warning indicator illuminate? 
      • Yes  : GO to  K7.
      • No  : GO to  K6.
  6. K6 CHECK CIRCUIT 31S-GC6 (GN/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C2220.
    • Measure the resistance between the brake fluid level switch C124 pin 2, circuit 31S-GC6 (BK/YE), harness side and ground.
      Fig 5: Measuring Resistance Between Brake Fluid Level Switch C124 Pin 2, Circuit 31S-GC6 (BK/YE), Harness Side And Ground
      G03952225Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : GO to  K12.
      • No  : REPAIR the circuit. TEST the system for normal operation.
  7. K7 CHECK CIRCUIT 91-GC7 (BK/BU) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the brake fluid level switch C124 pin 1, circuit 91-GC7 (BK/BU), harness side and ground.
      Fig 6: Measuring Resistance Between Brake Fluid Level Switch C124 Pin 1, Circuit 91-GC7 (BK/BU), Harness Side And Ground
      G03952226Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : INSTALL a new brake fluid level switch. TEST the system for normal operation.
      • No  : REPAIR the circuit. TEST the system for normal operation.
  8. K8 VERIFY THE PARKING BRAKE SWITCH OPERATION 
    • Key in OFF position.
    • Disconnect: Parking Brake Switch C2015.
    • Key in ON position.
    • Check the operation of the brake warning indicator.
    • Does the brake warning indicator turn off? 
      • Yes  : INSTALL a new parking brake switch. TEST the system for normal operation.
      • No  : GO to  K9.
  9. K9 VERIFY THE BRAKE FLUID LEVEL SWITCH OPERATION 
    NOTE: Make sure the brake fluid level is full prior to carrying out this test step.
    • Key in OFF position.
    • Disconnect: Brake Fluid Level Switch C124.
    • Key in ON position.
    • Check the operation of the brake warning indicator.
    • Does the brake warning indicator turn off? 
      • Yes  : INSTALL a new brake fluid level switch. TEST the system for normal operation.
      • No  : GO to  K10.
  10. K10 CHECK CIRCUIT 31S-GE44 (BK/RD) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C2220.
    • Measure the resistance between the parking brake switch C2015 pin 1, circuit 31S-GE44 (BK/RD), harness side and ground.
      Fig 7: Measuring Resistance Between Parking Brake Switch C2015 Pin 1, Circuit 31S-GE44 (BK/RD), Harness Side And Ground
      G03952227Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
      • Yes  : GO to  K11.
      • No  : REPAIR the circuit. TEST the system for normal operation.
  11. K11 CHECK CIRCUIT 31S-GC6 (BK/YE) FOR A SHORT TO GROUND 
    • Measure the resistance between the brake fluid level switch C124 pin 2, circuit 31S-GC6 (BK/YE), harness side and ground.
      Fig 8: Measuring Resistance Between Brake Fluid Level Switch C124 Pin 2, Circuit 31S-GC6 (BK/YE), Harness Side And Ground
      G03952225Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
      • Yes  : GO to  K12.
      • No  : REPAIR the circuit. TEST the system for normal operation.
  12. K12 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect the instrument cluster connector.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect the instrument cluster connector and make sure it seats correctly.
    • Operate the system and determine if 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. CLEAR the DTCs. TEST the system for normal operation.
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