Have bi xeon headlights. Front right side dipped bulb went off. Replaced with new bulb but did not work. Checked new bulb which is ok. Replaced ballast unit on bottom of headlight which had burned out. Now the dipped beam works, but light will not switch off. Interior cabin switch has no effect on it. Light still stays on even if key is out of ignition and car is locked. In order to stop the light draining my battery, I have to detach connector on the ignitor. If I remove the bulb, power is still draining from my battery ? Headlight full beam is ok. Any ideas. Thanks.