Lexus IS350 AWD Owner's Manual page 546

546
8-2. Steps to take in an emergency
Warning message
IS350 AWD/IS350/IS300 AWD/IS300_U
Details/Actions
Indicates a malfunction in the Drive-Start Control
A buzzer also sounds.
 Have the vehicle inspected by your Lexus dealer
immediately.
Indicates a malfunction in the Brake Override System
A buzzer also sounds.
 Have the vehicle inspected by your Lexus dealer
immediately.
Indicates that engine oil level is low
This message may appear if the vehicle is stopped on a
slope. Move the vehicle to a level surface and check to
see if the message disappears.
 Check the level of engine oil, and add if necessary.