2012 Toyota Prius Owners Manual - Page 772

4-3. Do-it-yourself maintenance STEP 3 Replace the light bulb, and install the bulb base. Align the 3 tabs on the light bulb with the mounting, and insert. STEP 4 Turn and secure the bulb base. Shake the bulb base gently to check that it is not loose, turn the headlights on once and visually confirm that no light is leaking through the mounting. 4 Maintenance and care 471