hello makoto, i happened to come to your post while googling the same problem with my 3sge beams celica. it was working well and all of a sudden its not starting. when turning the key there is only a click sound. at the same time i believe the headlights have been fused out or something. rest all electrics are working and i also tried jump starting which didnt work. can you tell me what earth wire was lose. i dont know how an earth wire can come lose when the car is running fine. anyone knows if it can be anything else? thanks in advance