I have the same lights on with my 2007 is250, but it ran fine so I just left them go. Then I installed aftermarket headlights and taillights in my car, and it wouldn't start. Checked fuses and installed a brake light switch and it still wont start, hoping I might have just adjusted the switch wrong. If not I have no idea what is wrong and I too dread taking it to a dealership. Does anyone know if there might have been a recall for the switch in the 2007 IS250's?