My 2001 toyota corolla worked fine until yesterday. I had this day light sensor in my car which turns on the head lights automatically in the night. But yesterday when I was getting back from work, the head lights didn't turn on and the battery LED on the dashboard starting glowing. Initially I thought the battery must have drained out but to my surprise, I was able to start the car, turn on the lights manually. I waited until today and tried to start the car again. It works fine but still the batter LED glows on the dashboard. I am able to turn on the head lights manually. Can you please help me telling what went wrong with my car?