Rear door child-protector lock
The door cannot be opened from inside the vehicle when the lock is set.
1. Unlock
2. Lock
These locks can be set to prevent children from opening the rear doors. Push down on each rear door switch to lock both rear doors.

See also:
Initialization
Items to initialize
The following items must be initialized for normal system operation in cases
such as after the battery is reconnected, or maintenance is performed on the vehicle.
...
Maintenance
Maintenance requirements
To ensure safe and economical driving, day-to-day care and regular
maintenance
are essential. It is the owner’s responsibility to perform regular
checks. Lexus recommen ...
Follow the correction procedures.
A buzzer sounds and a warning message is shown on the multi-informa- tion display.
After taking the specified steps to correct the suspected problem, check that the
warning message goes off.
...
