I know for a fact that plain jane ZX3's did indeed have side impact sensors since the beginning. My original focus, a 2000 zx3 stripper edition had side impact airbags; I remember the little suede patch on the fabric seat cover.. As to the location of the sensors, I would presume that they are probably somewhere on the crash beam inside the door or in the way back of the front fender, near the door opening.
I am an outspoken and enthusiastic Christian. I enjoy evangelizing to people with the help of anointed hip hop & rock. I think there's something truly AWESOME about listening to good music that truly makes you feel good inside.