I have a 2002 955i with the twin round bug eyed headlights. When the side lights are on, so slide switch on position 1 (off, side, headlights), only the left light comes on. Is this correct? Headlights - both lights. Full beam - both lights. Just "side lights" is single.... I can't quite follow the Haynes manual to determine if it should be one lit or two...?