When the VSC/TRAC or Active TRAC/hill-start assist control systems are operating
If the vehicle is in danger of slip- ping or rolling backward when starting on an incline, or if any of the drive wheels spins, the slip indi- cator light flashes to indicate that the VSC/TRAC or Active TRAC/ hill-start assist control systems are operating.
A buzzer (intermittent) sounds to indicate that VSC is operating.
The stop lights and high mounted stoplight turn on when the hill-start assist control system is operating.

See also:
Radar sensor
The radar sensor detects vehicles or other obstacles on or near the road ahead
and determines whether a collision is imminent based on the position, speed, and
heading of the obstacles.
...
Type C: function achieved by using DCM
Of the functions included with Lexus Enform with Safety Connect, Safety
Connect
can be achieved by using DCM.
For details, refer to “Owner’s Manual”. ...
Installing child restraints
Follow the child restraint system manufacturer’s instructions. Firmly secure
child restraints to the seats using the LATCH anchors or a seat belt.
Attach the top tether strap when installing a ch ...
