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

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. 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.
- Do the brake lights illuminate?
  - Yes : GO to A2.
  - No : REFER to EXTERIOR LIGHTING -- FUSION, MILAN & MKZ article.
A2 TEST SJB FUSE 5 (10A)
- 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 Electrical C3233.
- Ignition ON.
- Measure the voltage between selector lever harness C3233-1, circuit CET53 (BU/OG), vehicle harness side and ground, while applying the brake pedal.
  
  Fig 1: Measuring Voltage Between Selector Lever Harness C3233-1, Circuit CET53 (BU/OG), Vehicle Harness Side 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 C3233-1, circuit CET53 (BU/OG), vehicle harness side and ground.
  
  Fig 2: Measuring Resistance Between Selector Lever Harness C3233-1, Circuit CET53 (BU/OG), Vehicle Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
  - Yes : GO to A5.
  - No : REPAIR the circuit. TEST the system for normal operation.
A5 TEST THE BSIA POWER CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between the selector lever harness C3233-1, circuit CET53 (BU/OG), vehicle harness side and SJB C2280C-23, circuit CET53 (BU/OG), vehicle harness side.
  
  Fig 3: Measuring Resistance Between Selector Lever Harness C3233-1, Circuit CET53 (BU/OG) And SJB C2280C-23, Circuit CET53 (BU/OG)
  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 the circuit. TEST the system for normal operation.
A6 TEST THE BSIA GROUND CIRCUIT
- Ignition OFF.
- Measure the resistance between selector lever harness C3233-5, circuit GD116 (BK/VT), vehicle harness side and ground.
  
  Fig 4: Measuring Resistance Between Selector Lever Harness C3233-5, Circuit GD116 (BK/VT), Vehicle Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
  - Yes : INSTALL a new selector lever. REFER to SELECTOR LEVER in this service information.
  - No : REPAIR the circuit. TEST the system for normal operation.