I personally don't think it does have the 3.5mm just the USB. But I could be wrong, I'm sure if it did have it then you would have found it by now, they don't tend to hide them.
hey mate sorry to have to tell you this but it does not come with a 3.5mm jack, you can add one to your stereo but because you have B&M it makes it a bit harder if want an aux badly i can tell what you need to do as i have installed one on a evo 1.4 gp