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

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. P1 RETRIEVE THE RECORDED INSTRUMENT CLUSTER DTCS FROM BOTH THE CONTINUOUS AND ON-DEMAND SELF-TESTS 
    • Use the recorded instrument cluster DTCs from the continuous and on-demand self-tests.
    • Is DTC C1226 present? 
    1. Yes  : GO to  P10.
    2. No  : GO to P2
  2. P2 DETERMINE THE CONDITION 
    • Key in ON position.
    • Apply and release the parking brake while monitoring the SJB parking brake switch PID.
    • Do the PIDs agree? 
    1. Yes  : If always on, GO to  P14.

      If inoperative, GO to  P12.

    2. No  : If always on, GO to P3.

      If inoperative, GO to P7.

  3. P3 CHECK THE PARKING BRAKE SWITCH 
    • Key in OFF position.
    • Disconnect: Parking Brake Switch C2015.
    • Key in ON position.
    • Observe the brake warning indicator.
    • Did the brake warning indicator turn off? 
    1. Yes  : INSTALL a new parking brake switch. TEST the system for normal operation.
    2. No  : GO to P4.
  4. P4 CHECK THE SJB 
    • Key in OFF position.
    • Disconnect: SJB C2280c.
    • Key in ON position.
    • Observe the brake warning indicator.
    • Does the brake warning indicator turn off? 
    1. Yes  : GO to P5.
    2. No  : GO to  P6.
  5. P5 CHECK CIRCUIT 1309 (RD/YE) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between the SJB C2280c pin 17, circuit 1309, (RD/YE), harness side and ground.
      Fig 1: Checking Circuit 1309 (RD/YE) For Short To Ground
      G03277066Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to  P17.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  6. P6 CHECK CIRCUIT 977 (VT/WH) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
    • Measure the resistance between the instrument cluster C220b pin 20, circuit 977 (VT/WH), harness side and ground.
      Fig 2: Checking Circuit 977 (VT/WH) For Short To Ground
      G03277067Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to  P16.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  7. P7 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Parking Brake Switch C2015.
    • Measure the resistance between the parking brake switch C2015 pin 2, circuit 570 (BK/WH), harness side and ground.
      Fig 3: Checking Circuit 570 (BK/WH) For An Open
      G03277068Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to P8.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  8. P8 CHECK THE PARKING BRAKE INPUT 
    • Connect a fused (10A) jumper wire between the parking brake switch C2015 pin 1, circuit 1309 (RD/YE), harness side and the parking brake switch C2015 pin 2, circuit 57 (BK) harness side.
      Fig 4: Checking Parking Brake Input
      G03277069Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Does the brake warning indicator illuminate? 
    1. Yes  : INSTALL a new parking brake switch. TEST the system for normal operation.
    2. No  : REMOVE the jumper wire, Go to P9.
  9. P9 CHECK CIRCUIT 1309 (RD/YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Smart Junction Box (SJB) C2280c.
    • Measure the resistance between the parking brake switch C2015 pin 1, circuit 1309 (RD/YE), harness side and the SJB C2280c pin 17, circuit 1309, (RD/YE), harness side.
      Fig 5: Checking Circuit 1309 (RD/YE) For An Open
      G03277070Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to  P17.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  10. P10 CHECK THE ABS MODULE OPERATION 
    • Key in OFF position.
    • Disconnect: ABS Module C135.
    • Key in ON position.
    • Observe the brake warning indicator.
    • Does the brake warning indicator turn on? 
    1. Yes  : GO to  P18.
    2. No  : GO to P11.
  11. P11 CHECK CIRCUIT 22 (LB/BK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
    • Measure the resistance between the instrument cluster C220b pin 16, circuit 22 (LB/BK), harness side and ground.
      Fig 6: Checking Circuit 22 (LB/BK) For Short To Ground
      G03277071Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to  P16.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  12. P12 CHECK THE SJB 
    • Key in OFF position.
    • Connect a fused (10A) jumper wire between the SJB C2280c pin 18, circuit 977 (VT/WH) harness side and ground.
      Fig 7: Checking SJB
      G03277072Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Does the brake warning indicator illuminate? 
    1. Yes  : REMOVE the jumper wire, GO to  P17.
    2. No  : REMOVE the jumper wire, GO to P13.
  13. P13 CHECK CIRCUIT 977 (VT/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
    • Measure the resistance between the instrument cluster C220b pin 20, circuit 977 (VT/WH), harness side and the SJB C2280c pin 18, circuit 977, (VT/WH), harness side.
      Fig 8: Checking Circuit 977 (VT/WH) For An Open
      G03277073Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to  P16.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  14. P14 CHECK THE ABS MODULE OPERATION 
    • Key in OFF position.
    • Disconnect: ABS Module C135.
      • NOTE: If the fuse fails, repair the circuit for a short to power.
    • Connect a fused (5A) jumper wire between the ABS module C135 pin 27, circuit 22 (LB/BK), harness side and ground.
      • Fig 9: Checking ABS Module Operation
      G03277074Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Observe the brake warning indicator.
    • Does the brake warning indicator continue to illuminate? 
    1. Yes  : GO to P15.
    2. No  : GO to  P18.
  15. P15 CHECK CIRCUIT 22 (LB/BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
    • Measure the resistance between the instrument cluster C220b pin 16, circuit 22 (LB/BK), harness side and the ABS module C135 pin 27, circuit 22, (LB/BK), harness side.
      Fig 10: Checking Circuit 22 (LB/BK) For An Open
      G03277075Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to P16.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  16. P16 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all instrument cluster connectors.
    • Check for:
    • Corrosion
    • Pushed-out pins
    • Connect all instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . CLEAR the DTCs. REPEAT the selftest.
    2. No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the instrument cluster self-test.
  17. P17 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all SJB connectors.
    • Check for:
    • Corrosion
    • fPushed-out pins
    • Connect all SJB connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES . CLEAR the DTCs. REPEAT the self-test.
    2. No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  18. P18 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect the ABS module connector.
    • Check for:
    • Corrosion
    • Pushed-out pins
    • Connect the ABS module connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new ABS module. REFER to ANTI-LOCK CONTROL . CLEAR the DTCs. REPEAT the PCM self-test.
    2. No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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