ok, maybe its dumb but anyways i purchased an s40 2000 with just 87000 miles, and i have the doble deck cassete, cd and changer thing, but i was wondering if i could buy a cd changer unit for mp3 and plug it in, i havent asked the dealers yet i was wondering if i was lucky to do so. even though i dont even know where to place the cd changer unit. also i have problems with the lights, i turn the car on and the lights turn on(switch on 0 position, left), so i have to switch to mid position, and if i turn off the car i have to switch from mid to 0 position again, is that normal?¿

 

Don't know much about the cd changer but the light are fine, you should leave them on '0' unless its dark then put them on the last position, the light are on dipped beam all the time there called running lights. The middle position are parking lights and shouldnt be used when moving.

Hope that helps, Nick