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. ...

Maintenance
You are responsible for performance of the required maintenance indicated in the Owner’s Manual and this guide. Lexus will not deny a warranty claim solely because you do not have records to ...

If your vehicle overheats
If the engine overheats: Stop the vehicle in a safe place and turn off the automatic air conditioning system. Check to see if steam is coming out from under the hood. If you see steam: Stop ...