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

1. A1 CHECK DTCs 
   • Ignition ON.
   • Connect the scan tool.
   • Are DTCs B1319:11 and/or B1319:15 set? 
     • Yes  : GO to A2.
     • No  : GO to  A7.
2. A2 CHECK THE BCM FUSE 18 (10A) 
   • Ignition OFF.
   • Remove Body Control Module (BCM) fuse 18 (10A).
   • Check fuse: BCM 18 (10A).
   • Is the resistance less than 5 ohms? 
     • Yes  : Reinstall the fuse. GO to A3.
     • No  : GO to  A4.
3. A3 CHECK THE BCM POWER CIRCUIT 
   • Disconnect: Floor Shifter Harness C3245.
   • Inspect for damaged or pushed out terminals. Repair as necessary.
   • Ignition ON.
   • Measure the voltage between the floor shifter harness C3245, circuit CET53 (BU/OG) and ground while applying the brake pedal.
   • Is the voltage greater than 10 volts? 
     • Yes  : GO to  A6.
     • No  : GO to  A5.
4. A4 CHECK THE BSIA POWER CIRCUIT FOR A SHORT TO GROUND 
   • Disconnect: BCM C2280B.
   • Measure the resistance between floor shifter harness C3245-3, circuit CET53 (BU/OG) harness side and ground.
     Fig 1: Measuring Resistance Between Floor Shifter Harness C3245-3, Circuit CET53 (BU/OG) Harness Side And Ground

     Courtesy of FORD MOTOR CO.
   • Is the resistance greater than 10, 000 ohms? 
     • Yes  : INSTALL a new BCM. TEST the system for normal operation.
     • No  : REPAIR circuit CET53 (BU/OG) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.
5. A5 CHECK THE BSIA POWER CIRCUIT FOR AN OPEN 
   • Measure the resistance between floor shifter harness C3245-3, circuit CET53 (BU/OG) and BCM C2280B-49, circuit CET53 (BU/OG).
     Fig 2: Measuring Resistance Between Floor Shifter Harness C3245-3, Circuit CET53 (BU/OG) And BCM C2280B-49, Circuit CET53 (BU/OG)

     Courtesy of FORD MOTOR CO.
   • Is the resistance less than 5 ohms? 
     • Yes  : INSTALL a new BCM. MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
     • No  : REPAIR circuit CET53 (BU/OG) for an open. CLEAR the DTCs. TEST the system for normal operation.
6. A6 CHECK THE BSIA GROUND CIRCUIT FOR AN OPEN 
   • Ignition OFF.
   • Measure the resistance between floor shifter harness C3245-4, circuit GD115 (BK/GY) and ground.
     Fig 3: Measuring Resistance Between Floor Shifter Harness C3245-4, Circuit GD115 (BK/GY) And Ground

     Courtesy of FORD MOTOR CO.
   • Is the resistance less than 5 ohms? 
     • Yes  : GO to A7.
     • No  : REPAIR circuit GD112 (BK/GN) for an open. CLEAR the DTCs. TEST the system for normal operation.
7. A7 CHECK THE BSIA WITH THE SELECTOR LEVER CABLE DISCONNECTED 
   • If disconnected, connect the floor shifter 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 BSIA release the selector lever? 
     • Yes  : CHECK the selector lever cable function and adjust the cable if necessary. REFER to SELECTOR LEVER CABLE ADJUSTMENT - 6F35  or SELECTOR LEVER CABLE ADJUSTMENT - 6F50/6F55 .
     • No  : INSTALL a new BSIA. REFER to SELECTOR LEVER . TEST the system for normal operation.

Refer to OEM WIRING DIAGRAMS - TRANSMISSION CONTROLS - 6F35 or OEM WIRING DIAGRAMS - TRANSMISSION CONTROLS - 6F50 & 6F55 for schematic and connector information.