See also:

Radiator and condenser
Check the radiator and condenser and clear any foreign objects. If either of the above parts is extremely dirty or you are not sure of their condition, have your vehicle checked by your Lexus deale ...

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. ...

Initializing the system
Select “Initialize” and then “Confirm” using the “TUNE/SEL” knob. Select “Confirm” again using the “TUNE/SEL” knob.  - Initialization • The following data in the sy ...