I like to leave my headlights in the auto position and run headlights full time. On some cars I've had the low beams stay on all of the time and go off with the ignition. Of course with the Z4 they are only on when it gets dark. In a Ford that I own I put tape over the sensor and the sensor thought it was always dark and the lights behaved exactly like I wanted. Does anyone know where the sensor is in the Z4? Mark