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.
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HOMESERVICE MANUALSBUICK2000CENTURY CUSTOMREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSSHIFT INTERLOCK SYSTEMSYMPTOM TESTSSHIFT LOCK CONTROL ALWAYS ON (IGNITION IN ON POSITION)"Y" BODY
2000 Buick Century Custom
"Y" Body
2000 Buick Century CustomSECTION "Y" Body
- Disconnect brakelight switch 4-pin connector C2 and BTSI solenoid 4-pin connector. Turn ignition switch to ON position. Measure voltage between brakelight switch 4-pin connector C2 terminal "B" and ground. See Figure. If voltage is not 10-14 volts, go to next step. If voltage is 10-14 volts, check for short to battery power in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid 4-pin connector terminal "C". See Figure. See WIRING DIAGRAMS . Repair as necessary, then go to step 3.
- Turn ignition switch to OFF position. Reconnect brakelight switch 4-pin connector C2. Apply brake pedal and measure voltage between BTSI solenoid 4-pin connector terminal "C" and ground. See Figure. If voltage is 10-14 volts, replace brakelight switch, then go to next step. If voltage is not 10-14 volts, replace BTSI solenoid, then go to next step.
- Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See SHIFT INTERLOCK SOLENOID under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
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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.