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:
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Lexus Enform with Safety Connect−Overview
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Back door
The back door can be locked/unlocked and opened by the following procedures.
Locking and unlocking the back door
Entry function
Wireless remote control
Door lock switch
Opening the back door from ...
