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

External Controls

Pinpoint Tests

Refer to Wiring Diagram Set 29, Transmission Controls -Aisin AW21 for schematic and connector information. [1][2]Diagrams By Number

Refer to Wiring Diagram Set 30, Transmission Controls-6F35 for schematic and connector information. [1][2]Diagrams By Number

Refer to Wiring Diagram Set 37, Shift Interlock for schematic and connector information. [1][2]Diagrams By Number

PINPOINT TEST A : THE BRAKE SHIFT INTERLOCK SYSTEM DOES NOT RELEASE/LOCK CORRECTLY

A1 CHECK DTCs

- Ignition ON.

- Connect the scan tool.

Is DTC B2575 set?

Yes
GO to A2.

No
The issue may not be in the Brake Shift Interlock Actuator (BSIA) electrical system. GO to Symptom Chart - External Controls. Symptom Chart - External Controls

A2 CHECK FUSE 5 (10A)

- Ignition OFF.

- Remove Smart Junction Box (SJB) fuse 5 (10A).

- Check fuse: SJB (Smart Junction Box) 5 (10A).

Is the resistance less than 5 ohms?

Yes
GO to A3.

No
GO to A4.

A3 CHECK THE POWER CIRCUIT FOR VOLTAGE

- Disconnect: Selector Lever 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.





Is the voltage greater than 10 volts?

Yes
GO to A6.

No
GO to A5.

A4 CHECK THE POWER CIRCUIT FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: SJB (Smart Junction Box) C2280C.

- Measure the resistance between selector lever harness C3233-1, circuit CET53 (BU/OG), vehicle harness side and ground.





Is the resistance greater than 10,000 ohms?

Yes
GO to A5.

No
REPAIR circuit CET53 (BU/OG) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.

A5 CHECK THE 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 (Smart Junction Box) C2280C-23, circuit CET53 (BU/OG), vehicle harness side.





Is the resistance less than 5 ohms?

Yes
INSTALL a new SJB (Smart Junction Box). CLEAR the DTCs. TEST the system for normal operation.

No
REPAIR circuit CET53 (BU/OG) for an open. CLEAR the DTCs. TEST the system for normal operation.

A6 CHECK THE GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.

- Measure the resistance between selector lever harness C3233-5, circuit GD116 (BK/VT), vehicle harness side and ground.





Is the resistance less than 5 ohms?

Yes
INSTALL a new selector lever. REFER to Selector Lever - Fusion or Selector Lever - MKZ .

No
REPAIR circuit GD116 (BK/VT) for an open. CLEAR the DTCs. TEST the system for normal operation.