Hi Ian, Without knowing the age of your car, I can't confirm for sure, but for info, the switch on my 2002 V40 works as follows: 0 - All lights on - headlights, running lights, twin rear lights and side lights (daytime running lights) 1 - Side lights only at front, running lights and single pair of rear lights (parking mode) 2 - As per 0 - all lights. If you have a post 2000 car (twin headlights), you can use the daytime running light trick to switch them off at setting 0. Re interior lights, this may be a blown fuse or bulbs?