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

External Controls

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

Refer to Wiring Diagram Set 29, Transmission Controls for schematic and connector information Electrical Diagrams.

Refer to Wiring Diagram Set 37, Shift Interlock for schematic and connector information Electrical Diagrams.

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

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 Lighting and Horns.

A2 TEST THE Transmission Control Module (TCM) INTERNAL GROUND CIRCUIT OPERATION

- Ignition ON.

- Connect the scan tool.

- Using the scan tool, monitor the SHFTLCK_ALLW and BOO_TCM PIDS, while pressing the brake pedal off and on.

Does the SHFTLCK_ALLW and BOO_TCM status change?

Yes
GO to A3.

No
pinpoint test M. Pinpoint Test M: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool

A3 TEST THE BSIA (Brake Shift Interlock Actuator) POWER CIRCUIT

- Disconnect: Selector Lever Harness C3245.

- Ignition ON.

- Measure the voltage between selector lever harness C3245-1, circuit CCA26 (BU/GY), vehicle harness side and ground, while applying the brake pedal.





Is the voltage greater than 10 volts?

Yes
GO to A4.

No
REPAIR circuit CCA26 (BU/GY) for an open.

A4 TEST THE BSIA (Brake Shift Interlock Actuator) GROUND CIRCUIT

- Disconnect: Transmission Control Module (TCM) C1ET02.

- Measure the resistance between selector lever harness C3245-12 and C1ET02-49.





Is the resistance less than 5 ohms?

Yes
INSTALL a new selector lever assembly. For addition information, refer to Selector Lever Selector Lever Knob.

No
REPAIR circuit CET53 (BU/OG) for an open.