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

  1. A1 TEST THE BRAKE LIGHTS 
    • Apply the brake pedal and view the brake lights.
    • Do the brake lights illuminate? 
    1. YES  : Go to  A2.
    2. NO  : REFER to EXTERIOR LIGHTING article.
  2. A2 TEST Brake Shift Interlock Actuator (BSIA) POWER CIRCUIT 
    • Disconnect: Selector Lever Electrical C3245 (2.3L/3.0L engine) or C3233 (3.5L engine)
    • Key in ON position.
      • Fig 1: Testing Shift Interlock Actuator Power Circuit - 3.0L or a 2.3L
      GF0029865Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.0L or a 2.3L engine, measure the voltage between selector lever harness C3245-1, circuit VET13 (GY/BU), vehicle harness side and ground, while applying the brake pedal.
      • Fig 2: Measuring Voltage Between Selector Lever Harness C3245-1, Circuit VET13 (GY/BU)
      GF0029866Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.5L engine, measure the voltage between selector lever harness C3233-1, circuit VET13 (GY/BU), vehicle harness side and ground, while applying the brake pedal.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A5.
    2. NO  : Go to  A3.
  3. A3 TEST THE BSIA POWER CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Smart Junction Box (SJB) C2280C
      • Fig 3: Testing BSIA Power Circuit For A Short To Ground
      GF0041471Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness C3245-1, circuit VET13 (GY/BU), vehicle harness side and ground.
      • Fig 4: Measuring Resistance Between Selector Lever Harness C3245-1, Circuit CET53 (BU/OG) & Ground
      GF0031984Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.5L engine, measure the resistance between selector lever harness C3233-1, circuit VET13 (GY/BU), vehicle harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. A4 TEST THE BSIA POWER CIRCUIT FOR AN OPEN 
    • Key in OFF position.
      • Fig 5: Testing BSIA Power Circuit For An Open
      GF0041472Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness C3245-1, circuit VET13 (GY/BU), vehicle harness side and SJB C2280C-14, circuit VET13 (GY/BU), vehicle harness side.
      • Fig 6: Measuring Resistance Between Selector Lever Harness C3245-1, Circuit VET13 (GY/BU)
      GF0041473Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.5L engine, measure the resistance between the selector lever harness C3233-1, circuit VET13 (GY/BU), vehicle harness side and SJB C2280C-14, circuit VET13 (GY/BU), vehicle harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new SJB. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. A5 TEST THE BSIA GROUND CIRCUIT 
    • Key in OFF position.
      • Fig 7: Testing Shift Interlock Actuator Ground Circuit - 3.0L or a 2.3L
      GF0029867Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness C3245-4, circuit GD116 (BK/VT), vehicle harness side and ground.
      • Fig 8: Measuring Resistance Between Selector Lever Harness C3245-4, Circuit GD116 (BK/VT)
      GF0029868Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.5L engine, measure the resistance between selector lever harness C3233-5, circuit GD116 (BK/VT), vehicle harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new selector lever. REFER to Selector Lever .
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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