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Pinpoint Test A: Brake Shift Interlock System Does Not Release/Lock Correctly

  1. A1 TEST THE BRAKE LIGHTS 
    • Apply the brake pedal and view the brake lights.
    • Brake lamps should illuminate within 15 mm (0.59 in) of pedal travel
    • Do the brake lights illuminate within 15 mm (0.59 in) of pedal travel? 
  2. A2 TEST SJB FUSE 5 (10A) 
    • Ignition OFF.
    • Check fuse: Smart Junction Box (SJB) 5 (10A).
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to A3.
    • No  : INSTALL a new fuse. GO to A3.
  3. A3 TEST THE BSIA POWER CIRCUIT 
    • Disconnect: Selector Lever Harness C3245.
    • Ignition ON.
    • Measure the voltage between selector lever harness C3245-1, circuit CET53 (BU/OG) and ground, while applying the brake pedal.
      Fig 1: Measuring Voltage Between Selector Lever Harness C3245-1, Circuit CET53 (BU/OG) And Ground
      G06283470Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  A6.
    • No  : GO to A4.
  4. A4 TEST THE BSIA POWER CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SJB C2280F.
    • Measure the resistance between selector lever harness C3245-1, circuit CET53 (BU/OG) and ground.
      Fig 2: Measuring Resistance Between Selector Lever Harness C3245-1, Circuit CET53 (BU/OG) And Ground
      G06283471Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to A5.
    • No  : REPAIR circuit CET53 (BU/OG) for a short to ground. TEST the system for normal operation.
  5. A5 TEST THE BSIA POWER CIRCUIT FOR AN OPEN 
    • Measure the resistance between selector lever harness C3245-1, circuit CET53 (BU/OG) and SJB C2280F-23, circuit CET53 (BU/OG).
      Fig 3: Measuring Resistance Between Selector Lever Harness C3245-1, Circuit CET53 (BU/OG) And SJB C2280F-23, Circuit CET53 (BU/OG)
      G06283472Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new SJB. TEST the system for normal operation.
    • No  : REPAIR circuit CET53 (BU/OG) for an open.
  6. A6 TEST THE BSIA GROUND CIRCUIT 
    • Ignition OFF.
    • Measure the resistance between selector lever harness C3245-5, circuit GD114 (BK/BU) and ground.
      Fig 4: Measuring Resistance Between Selector Lever Harness C3245-5, Circuit GD114 (BK/BU) And Ground
      G06283473Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to A7
    • No  : REPAIR circuit GD114 (BK/BU). TEST the system for normal operation.
  7. A7 TEST THE BSIA WITH THE SELECTOR LEVER CABLE DISCONNECTED 
    • Connect: Selector Lever Harness C3245.
    • Disconnect the selector lever cable at the selector lever.
    • Ignition ON.
    • Apply the brake pedal and move the selector lever out of the park position.
    • Does the brake shift interlock system release the selector lever correctly? 
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