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

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

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?
- Yes: GO to A2 .
- No: REFER to EXTERIOR LIGHTING .
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 .
A3 TEST 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
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: GO to A6.
- No: GO to A4 .
A4 TEST THE BSIA POWER CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280C.
- Measure the resistance between selector lever harness C3245-1, circuit CET53 (BU/OG) and ground.
  
  Fig 2: Checking Circuit CET53 For Short To Ground
  Courtesy 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.
A5 TEST THE BSIA POWER CIRCUIT FOR AN OPEN
- Measure the resistance between selector lever harness C3245-1, circuit CET53 (BU/OG) and SJB C2280C-23, circuit CET53 (BU/OG).
  
  Fig 3: Checking Circuit CET53 For An Open
  Courtesy 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.
A6 TEST BSIA GROUND CIRCUIT
- Ignition OFF.
- Measure the resistance between floor selector lever harness C3245-4, circuit GD112 (BK/GN) and ground.
  
  Fig 4: Checking Circuit GD112
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to A7
- No: REPAIR circuit GD112 (BK/GN). TEST the system for normal operation.
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?
- Yes: Check selector cable function and adjust the cable If necessary. REFER to SELECTOR LEVER CABLE ADJUSTMENT .
- No: INSTALL a new selector lever. REFER to SELECTOR LEVER .