Toyota Lexusc Owner's Handbook Manual page 211

OCCUPANT RESTRAINT SYSTEMS
"
1 Collision from the side
2 Collision from the rear
3 Vehicle rollover
The SRS front airbags are generally not designed to inflate
if the vehicle is involved in a side or rear collision, if it rolls
over, or if it is involved in a low-speed frontal collision.
But, whenever a collision of any type causes sufficient
forward deceleration of the vehicle, deployment of the
SRS front airbags may occur.
192
"
1 Hitting a curb, edge of pavement or hard surface
2 Falling into or jumping over a deep hole
3 Landing hard or vehicle falling
The SRS front airbags may also deploy if a serious impact
occurs to the underside of your vehicle. Some examples
are shown in the illustration.