Lexus 2003 LS Owner's Manual page 207

(b) Windshield defogging and defrosting
21L068a
To remove interior fog on the windshield –
Push the "FRONT WINDSHIELD" button.
To remove frost or exterior fog on the windshield –
1. Place the temperature control button at the maximum
temperature.
2. Push the "FRONT WINDSHIELD" button.
3. Push the fan speed control button on the right side to obtain
a maximum air flow.
For further information for removing frost and fog, see "Lower
vent" on page 198.
When the "FRONT WINDSHIELD" button is pushed while
operating in automatic mode, the air conditioning is set to
operate and the OUTSIDE AIR mode is set.
If you push the "FRONT WINDSHIELD" button once again
while in the FRONT WINDSHIELD mode, the mode then
returns to the last mode used.
CAUTION
Do not use the "FRONT WINDSHIELD" button during
cooled air operation in extremely humid weather. The
difference between the temperature of the outside air
and that of the windshield could cause the outer surface
of the windshield to fog up blocking your vision.
When you turn the ignition switch on after the removal and
installation of the battery terminal, the indicator light may flash
and the operating sound of the motor may be heard. This does
not indicate a malfunction.
You may hear the operating sound of the motor about 70
seconds after the ignition switch is turned off. This is not also
a malfunction.
AIR CONDITIONING
193