In order to install an HID conversion kit in a 9th or 10th generation Toyota Corolla (2000 - 2008) you must disable the DRL circuit. This is because of the way the DRL circuit operates you will not be able to have an HID system working on the low beam. The DRL module sends only 5 vdc to the low beam bulb, causing the factory bulb to dim but it will cause an HID bulb to strobe, and possibly damage the ballast.
To do this Install, read our full PDF instruction sheet here