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Pinpoint Test F: The STOPLAMPS Are Inoperative

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. F1 CHECK THE VOLTAGE TO THE BRAKE PEDAL POSITION (BPP) SWITCH 
    • Disconnect: BPP Switch C278.
    • Measure the voltage between the BPP switch C278 pin 1, circuit 10 (LG/RD), harness side and ground.
      Fig 1: Checking Voltage To Brake Pedal Position (BPP) Switch
      G03277188Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to  F3.
    2. No  : GO to F2.
  2. F2 CHECK THE CIRCUIT 10 (LG/RD) FOR AN OPEN 
    • Disconnect: SJB C2280b.
    • Measure the resistance between the SJB C2280b pin 31, circuit 10 (LG/RD), harness side and the BPP switch C278 pin 1, circuit 10 (LG/RD), harness side.
      Fig 2: Checking Circuit 10 (LG/RD) For An Open
      G03277189Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to F4.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  3. F3 CHECK THE BPP SWITCH OPERATION 
    • Connect a 10A fused jumper wire between the BPP switch C278 pin 1, circuit 10 (LG/RD), harness side and the BPP switch C278 pin 2, circuit 511 (LG), harness side.
      Fig 3: Checking BPP Switch Operation
      G03277190Courtesy of FORD MOTOR CO.
    • Do the stoplamps illuminate? 
    1. Yes  : INSTALL a new BPP switch. REFER to BRAKE PEDAL POSITION (BPP) SWITCH . TEST the system for normal operation.
    2. No  : REPAIR circuit 511 (LG). TEST the system for normal operation.
  4. F4 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • Disconnect all SJB connectors.
    • Check for:
      • Corrosion
      • Pushed-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 . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
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