My sister owns 2018 Vitz with safety sense for like 6 months. She never have experienced Auto brake in action. I drove that too, sometimes aggressively but i get only brake warnings sometimes.
I bought a Grace about a month ago and i had 4 instances of mild auto brake application already (3 times when trying to squeeze through a narrow part of the road with oncoming vehicles and once actually going behind a vehicle)
Doesn't the Vitz come with Auto emergency Brakes?