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

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  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 .
  2. A2 TEST SMART JUNCTION BOX (SJB) FUSE 5 (10A) 
    • Key in OFF position.
    • Check fuse: 5 (10A)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A3.
    2. NO  : INSTALL a new fuse. Go to  A3.
  3. A3 TEST SHIFT INTERLOCK ACTUATOR POWER CIRCUIT 
    • Disconnect: Selector Lever Harness Connector C3245
    • Key in ON position.
      • Fig 1: Measuring Voltage Between Selector Lever Harness Connector C3245-1, Circuit CET53 (BU/OG) & Ground
      GF0029866Courtesy of FORD MOTOR CO.
    • Measure the voltage between selector lever harness connector C3245-1, circuit CET53 (BU/OG) and ground, while applying the brake pedal.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A6.
    2. NO  : Go to  A4.
  4. A4 TEST THE SHIFT INTERLOCK ACTUATOR POWER CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280C
      • Fig 2: Measuring Resistance Between Selector Lever Harness C3245-1, Circuit CET53 (BU/OG) & Ground
      GF0031984Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever harness C3245-1, circuit CET53 (BU/OG) and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A5.
    2. NO  : REPAIR circuit CET53 (BU/OG) for a short to ground. TEST the system for normal operation.
  5. A5 TEST THE SHIFT INTERLOCK ACTUATOR POWER CIRCUIT FOR AN OPEN 
      Fig 3: Measuring Resistance Between Selector Lever Harness C3245-1, CET53 (BU/OG) & SJB C2280C-23
      GF0031985Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever harness C3245-1, circuit CET53 (BU/OG) and SJB C2280C-23, circuit CET53 (BU/OG).
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new SJB. TEST the system for normal operation.
    2. NO  : REPAIR circuit CET53 (BU/OG) for an open.
  6. A6 TEST SHIFT INTERLOCK ACTUATOR GROUND CIRCUIT 
    • Key in OFF position.
      • Fig 4: Measuring Resistance Between Floor Selector Lever Harness Connector C3245-4, GD112 (BK/GN) & Ground
      GF0031986Courtesy of FORD MOTOR CO.
    • Measure the resistance between floor selector lever harness connector C3245-4, circuit GD112 (BK/GN) and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new selector lever. REFER to Selector Lever .
    2. NO  : REPAIR circuit GD112 (BK/GN). TEST the system for normal operation.
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