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. ...

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. ...

Using the audio system
Audio system - Vehicles with a navigation system. Owners of models equipped with a navigation system should refer to the “Navigation System Owner’s Manual”. - Vehicles without a navigation s ...