Hi there. I recently purchased a 2000 S40 and cannot figure out the center rear seat belt. It doesn't come across the lap of the passenger, rather, the belt doubles across the chest. I have pulled up the bottom seat and laid the back down, but I cannot figure out how the seat belt threads around the seat to produce a lap belt (there is no separation in the seat between the drive rear and built in center booster). Is this how the center rear seat belt is supposed to be, without a strap across the lap?