Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Brake Transmission Shift Interlock (BTSI) System
This system does not allow the shift lever to be moved out of Park unless the brake pedal is pressed. With the brake pedal released and the ignition on, current flows through the BTSI solenoid to ground, energizing the solenoid. With the solenoid energized, a lock pawl protrudes from the solenoid, preventing the shift lever from being moved.
With the brake pedal pressed, current flows through the stoplight switch to the ground side of the solenoid. Under this condition, battery voltage is available on the positive and negative sides of the solenoid. This causes the solenoid to de-energize, releasing the lock pawl.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.