The seal of the rear lamp assembly becomes unsealed and lets water in. Burns our bulbs and short out electrical system because of this. Second right rear assembly was replaced today and now front units are also foggy so I know that the seal on the lamp unit is also wearing. I read about this with other Prius and other c models. I had to buy actual Toyota parts as there are no aftermarket units.

- Burlington, VT, USA

I was driving at night on back roads when both headlights went out. I stopped the car, turned it off and restarted it to see what would happen. The lights did not go on, however, I found that if I held the switch up as though I was turning on high beams, the high beams worked. I could not get the low beams to work. I was taking someone home and stopped at their house. When I came back to the car and turned it on, the lights worked normally.

- Turners Falls, MA, USA