Have the malfunction repaired immediately.
Lexus GX / Lexus GX Owners Manual / When trouble arises / Steps to take in an emergency / If a warning message is displayed / Have the malfunction repaired immediately.
After taking the specified steps to correct the suspected problem, check that the warning message and light go off.
See also:
Emergency flashers
Use the emergency flashers if the vehicle malfunctions or is involved in an
accident.
Press the switch to flash all the turn signal lights. To turn them off, push
the switch once again.
NOTICE ...
Horn
To sound the horn, press on or close to the
mark.
...
Scheduled Maintenance Log
If you drive only occasionally under any of the special operating conditions
noted, it is not necessary to change the oil every six months or 5,000 miles or
to perform the additional services list ...