Lexus GX470 2004 Owner's Manual page 188

"
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 side and curtain shield airbags may deploy if a
serious impact occurs to the underside of your vehicle.
Some examples are shown in the illustration.
OCCUPANT RESTRAINT SYSTEMS
16PY169
171