I have a 2004 S60 with the Xenon upgrades, and a bulb just went out. I need to go somewhere tonight and don't have time to buy a new bulb (nearest dealership is 30+ mins away). I have installed xenon bulbs in the daytime running lamps as well, but there is no way to force them on at night that I am aware of.

Where is the headlight sensor so I can possibly pull a quick-fix for just the night and shine a light into it? It is not the dash or anywhere obvious.

Thank you for your help.