from the site-
CONFIGURABLE CONNECTORS
When installing HIDs in a dual-filament setup, you must use the vehicle's wiring, which is 3 wires: one ground, one high-beam power, and one low-beam power. Since standard bulbs do not require a particular configuration or polarity, auto manufacturers do not always use a uniform configuration. When you plug the kit in, the high beam may come on with your low beam, and vice versa. To solve this problem, we are proud to include configurable connectors with all of our dual-filament kits, making it simple to switch the wiring as needed. The plug and play connectors can be switched in seconds to easily configure the kit for your particular vehicle.
edit: Either that is your problem or you need to check your hi-lo switch for the headlights.
