Headlight fault

Hi to all,
I have an '05 HZJ 105 cruiser (updated version) and last night my neighbor knocks on the front door as tells me that I have left my headlights on (they where shining in his window), how can they be on I thought to myself as I unlocked the door and switch them off, this is where it gets weird, the switch WAS off and after turning them on/off/on/off the headlights stayed on, once I turned the ignition on, the lights went off and stayed off.
They weren't on at 8.00 pm when my wife came home and my neighbor woke me at about 12, the lights where dull by that time, the battery had virtually no charge so I linked the 2nd battery and that got me to work which was only 15 minutes away.

Once I got to work I turned off the headlights (4am) and left the yard,
at about 7.30 boss rings me and says that I left my lights on!

This afternoon once I got back I linked the 2nd battery (again) to start and noticed the headlights where on low beam and staying on(switch was OFF) but no taillights or dash lights.

I'm aware that this vehicle has a body module for things such as "day lights" and the ability to turn off headlights that have been left on accidently, could this be malfunctioning?
I have pulled the fuses while I recharge the battery tonight, so, my question is, has anybody encountered something similar, I have discounted a stuck relay simply because it has to be on to begin with.
I think I'll have to take it to Toyota but before I do I would like hear other suggestions.


Shane