rear passenger o/s floor full with water in my s40 any help guys

check sunroof drain , it might be clogged , or disconnected. check under pass seat. try to dry it with blowdryer or something, there is a lot of electronics under.. if not drain, window seal. Try spilling water and have some one sit inside after you took pillar panel off i got a v8xc90, but most components match urs. i had the drain disconnected under seat.