Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

I recently followed some of the steps on this tutorial Here but didnt have the wires in the fusebox for the relay to fit in. Because i didnt have the wires i just connected the ground of the relay to the door switch and the live to one connecting to the headlight switch.

The relay works alright but it also buzzes when i open the passanger door (With headlights on) and also buzzes when i have the interior light on (With headlights on).

Does anybody know what i have done wrong, i have just tried to connect it to other lives in the switch but same result. Could it be because i am not using the 3rd pin on the relay or something else.

Thanks in advance to any help.