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:
Have the vehicle inspected by your Lexus dealer immediately.
Failing to investigate the cause of the following warnings may lead to the system
operating abnormally and possibly cause an accident. Have the vehicle inspected
by your Lexus dealer immediately.
...
Destination search
Push the “DEST” button.
You can use one of 11 different methods to search your destination.
INFORMATION
When searching the destination, the response to the screen button may be slow. ...
Safety Connect LED light Indicators
When the “ENGINE START STOP” switch is turned to IGNITION ON mode, the red indicator
light comes on for 2 seconds then turns off.
Afterward, the green indicator light comes on, indicating that ...
