as far as I know, passo got no mobilizer..unless your car is equipped with smart key, then it has.
smart key of 2006-07 model (big type & white blue color) and 2008 model (small type & black color).
If you car is using standard key, you can duplicate it and the duplicated one can turn the ignition thus can start your car.
So here we in malaysia, prefer installed aftermarket safety car alarm system if our passo got no smart key.
but different to malaysia passo model of perodua myvi. this car got immobilizer even without the smart key.
anyway, just my experience. hope it help you.