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.
1999 Buick Century CustomFACTORY OEM SERVICE PROCEDURE
Test F: Power Window Lockout Function Is Inoperative
- Turn the ignition switch to the LOCK position. Disconnect the left front window switch harness connector. Using a test light backprobe between the left front window switch harness connector C2 terminal A and ground. If test light illuminates, go to step 3. If test light does not illuminate, go to next step.
- Replace the left front window switch. See WINDOW SWITCH under REMOVAL & INSTALLATION. After repair has been made, go to POWER WINDOWS SYSTEM CHECK under TROUBLESHOOTING.
- Repair short to battery power in circuit 1307. After repair has been made, go to POWER WINDOWS SYSTEM CHECK under TROUBLESHOOTING.
Factory Service Tools
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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.