1. Park your car in a safe and well-lit area, and turn off the engine.
2. Open the hood of your car.
3. Locate the headlight assembly that needs the bulb replaced. On the Celica GT, this is typically the one that is located closest to the center of the car.
4. There is a rubber cover on the back of the headlight assembly. Pull the rubber cover to remove it.
5. Locate the bulb holder. It is typically a black or gray plastic piece that holds the bulb in place.
6. Gently twist the bulb holder counterclockwise to remove it from the headlight assembly.
7. Remove the old bulb from the bulb holder.
8. Insert the new bulb into the bulb holder. Make sure to align the pins on the bulb with the slots in the bulb holder.
9. Gently twist the bulb holder clockwise to secure it in place.
10. Replace the rubber cover.
11. Close the hood of your car.
Your new headlight bulb should now be working properly. If it is not, check to make sure that the bulb is properly seated in the bulb holder and that the electrical connection is secure.
