Lexus LS460 - A Warning Buzzer Sounds During Driving; The Engine Switch Is Turned off Automatically

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What to do if... (Troubleshooting)
LS460_EE (OM50D49E)

It is locked automatically to prevent theft of the vehicle.
(P. 209)
 Is the window lock switch pressed?
The power window except for the one at the driver’s seat
cannot be operated if the window lock switch is pressed.
(P. 185)
 The auto power off function will be operated if the vehi-
cle is left in ACCESSORY mode for a period of time.
(P. 209)
 The seat belt reminder light is flashing
Are the driver and the front passenger wearing the seat
belts?
(P. 828)
 The parking brake indicator is on
Is the parking brake released? (P. 226)
Depending on the situation, other types of warning buzzer
may also sound. (P. 824, 833)
The windows do not open or close by operating the power
window switches
The engine switch is turned off automatically
A warning buzzer sounds during driving