Pinpoint Test D: Brake Shift Interlock Inoperative

D1 CHECK FOR FEM DTCs
- Retrieve FEM DTCs. Refer to EXTERIOR LIGHTING .
- Are any DTCs retrieved related to the brake switch?
Yes : REFER to EXTERIOR LIGHTING .

No : GO to D2 .
D2 CHECK FOR VOLTAGE ON CIRCUIT 7S-TA33 (YE/VT)
- Key in OFF position.
- Disconnect: Brake Shift Interlock C322.
- Key in ON position.
- Press and hold the brake pedal.
- Measure the voltage between brake shift interlock C322 pin 2, circuit 7S-TA33 (YE/VT), harness side and ground.
  
  Fig 1: Checking Voltage On Circuit 7S-TA33 (YE/VT)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to D5.

No : GO to D3 .
D3 CHECK CIRCUIT 75-TA33 (YE/VT) FOR SHORT TO GROUND
- Disconnect: FEM C201f.
- Measure the resistance between brake shift interlock C322 pin 2, circuit 7S-TA33 (YE/VT), harness side and ground.
  
  Fig 2: Checking Circuit 75-TA33 (YE/VT) For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes : GO to D4 .

No : REPAIR the circuit. TEST the system for normal operation.
D4 CHECK CIRCUIT 7S-TA33 (YE/VT) FOR OPEN
- Measure the resistance between brake shift interlock C322 pin 2, circuit 7S-TA33 (YE/VT), harness side and FEM C201f pin 15, circuit 7S-TA33 (YE/VT), harness side.
  
  Fig 3: Checking Circuit 7S-TA33 (YE/VT) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : INSTALL a new FEM; REFER to MULTIFUNCTION ELECTRONIC MODULES .

No : REPAIR the circuit. TEST the system for normal operation.
D5 CHECK CIRCUIT 31-TA33 (BK) FOR AN OPEN
- Measure the resistance between brake shift interlock C322 pin 1, circuit 31-TA33 (BK), harness side and ground.
  
  Fig 4: Checking Circuit 31-TA33 (BK) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : INSTALL a new brake shift interlock actuator; REFER to BRAKE SHIFT INTERLOCK ACTUATOR . TEST the system for normal operation.

No : REPAIR the circuit. TEST the system for normal operation.