Lexus 2004 GX470 Owner's Manual page 77

GAUGES, METERS AND SERVICE REMINDER INDICATORS
(i) Automatic Transmission Fluid Temperature
Warning Light
This light warns that the automatic transmission fluid
temperature is too high.
NOTICE
Continued driving with the warning light on may
damage the automatic transmission.
62
If this light comes on while you are driving, slow down and pull
off the road. Stop the vehicle at a safe place and put the
selector lever in "P" and leave the engine idling until the light
goes off. If the light goes off, you can start the vehicle again.
If the light does not go off, call a Lexus dealer or qualified repair
shop for assistance.