1674-5. Using the driving support systems
4
Driving
■If a warning message is displayed on the multi-information display
A system may be temporarily unavailable or  there may be a malfunction in the system.
●In the following situations, perform the action s specified in the table. When the normal 
operating conditions are detected, the me ssage will disappear and the system will 
become operational. 
If the message does not disappear, contact your Lexus dealer.
SituationActions
When the area around a sensor is covered 
with dirt, moisture (f ogged up, covered with 
condensation, ice, etc. ), or other foreign 
matterTo clean the part of the windshield in front of 
the front camera, use the windshield wipers 
or the windshield defogger of the air condi-
tioning system ( P.252).
When the temperature around the front 
camera is outside of th e operational range, 
such as when the vehicle is in the sun or in an 
extremely cold environment
If the front camera is hot, such as after the 
vehicle had been parked in the sun, use the 
air conditioning system  to decrease the tem-
perature around the front camera. 
If a sunshade was used when the vehicle was 
parked, depending on it s type, the sunlight 
reflected from the surface of the sunshade 
may cause the temperature of the front cam-
era to become excessively high.
If the front camera is  cold, such after the 
vehicle is parked in an extremely cold envi-
ronment, use the air conditioning system to 
increase the temperature around the front 
camera. 
The area in front of the front camera is 
obstructed, such as when the hood is open 
or a sticker is attached  to the part of the 
windshield in front of the front camera.
Close the hood, remove the sticker, etc. to 
clear the obstruction. 
3386-3. Do-it-yourself maintenance
WARNING
●Do not touch the glass portion of the 
light bulb with bare hands. When it is 
unavoidable to hold the glass portion, 
use and hold with a clean dry cloth to 
avoid getting moisture and oils on the 
bulb. 
Also, if the bulb is scratched or 
dropped, it may blow out or crack.
●Fully install light bulb and any parts 
used to secure it. Failure to do so may 
result in heat damage, fire, or water 
entering the light unit. This may dam-
age the light or cause condensation to 
build up on the lens.
■To prevent damage or fire
●Make sure bulb is fully seated and 
locked.
●Check the wattage of the bulb before 
installing to prevent heat damage. 
3787-2. Steps to take in an emergency
radiator core (radiator) for any 
leaks.
Radiator
Cooling fan
If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
4The coolant level is satisfactory if it 
is between the “F” and “L” lines on 
the reservoir.
Reservoir
“F” line
“L” line
Coolant inlet cap
5 Add coolant if necessary.
Water can be used in an emergency if  coolant is unavailable.
6
Start the engine and turn the air 
conditioning system on to check 
that the radiator cooling fan oper-
ates and to check for coolant leaks 
from the radiator or hoses.
The fan operates when the air conditioning 
system is turned on  immediately after a 
cold start. Confirm that the fan is operating 
by checking the fan sound and air flow. If it 
is difficult to check these, turn the air con-
ditioning system on  and off repeatedly. 
(The fan may not oper ate in freezing tem-
peratures.)
7 If the fan is not operating:
Stop the engine immediately and 
contact your Lexus dealer.
If the fan is operating: 
Have the vehicle inspected at the 
nearest Lexus dealer.
A
B
A
B
C
D
WARNING
■When inspecting under the hood of 
your vehicle
Observe the following precautions. 
Failure to do so may result in serious 
injury such as burns.
●If steam is seen coming from under the 
hood, do not open the hood until the 
steam has subsided. The engine com-
partment may be very hot.