I have a 2004 Megane.
The headlights, or more correctly the main beam seems to come on randomly when the car is parked with the keys out.
At the same time the indicators also show a fault, with no left indicator.
I've tried cleaning the light switch on the stalk with wd40, that did seem to work initially, but the fault reoccurred latter. This may have been coincidental.
I have to disconnect the battery when not using the car to save the bettery. I did this last night.
When I came to use the car this morning, after reconnecting the battery, the fault had gone - only for the fault to reappear a couple of hours later, whist the car had been parked.
Very odd.