The last generation of the Toyota Celica uses hyperwhite halogen headlights, while previous models use traditional halogen headlights; however, both headlight types work essentially the same. The headlights use a filament inside the headlight housing and a fluted headlight housing lens to disperse the headlight beam across the road surface. When this filament breaks, the headlight needs to be replaced. A replacement headlight can be purchased from most auto parts stores.
Open the bonnet and unplug the electrical power connector from the back of the headlight.
Rotate the headlight collar counterclockwise and remove it from the headlight housing assembly.
Align the tabs on the new headlight with the notches cut into the headlight housing.
Press the headlight into the housing and rotate the headlight clockwise to secure it to the housing assembly.
Plug the electrical connector back into the headlight.
Don't touch the glass portion of the headlight. The oils from your fingers can cause a failure of the headlight inside the housing when you turn on the headlight.