IS350 AWD/IS350/IS300- Page 300

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6-3. Do-it-yourself maintenance

communication device

If tire position information is not correctly 

displayed due to the radio wave conditions, 

the display may be corrected by driving and 

changing the radio wave conditions.

●

When the vehicle is parked, the time 

taken for the warning to start or go off 

could be extended.

●

When tire inflation pressure declines rap-

idly for example when a tire has burst, the 

warning may not function.

■

Warning performance of the tire pres-

sure warning system

The warning of the tire pressure warning 

system will change in accordance with driv-

ing conditions. For this reason, the system 

may give a warning even if the tire pressure 

does not reach a low enough level, or if the 

pressure is higher than the pressure that 

was adjusted to when the system was initial-

ized.

When replacing the tires or wheels, the 
tire pressure warning valve and trans-
mitters must be installed to the wheels 
which will be installed to the vehicle.
When new tire pressure warning 
valves and transmitters are installed, 
new ID codes must be registered in the 
tire pressure warning computer and 
the tire pressure warning system must 
be initialized. (



P.302)

■

Replacing tires and wheels

If the ID code of the tire pressure warning 

valve and transmitter is not registered, the 

tire pressure warning system will not work 

properly. After driving for about 20 min-

utes, the tire pressure warning light blinks 

for 1 minute and stays on to indicate a sys-

tem malfunction.

■

The tire pressure warning system 
must be initialized in the following 
circumstances:



When rotating the tires.



When the tire inflation pressure is 
changed such as when changing 
traveling speed or load weight.



When changing the tire size.

When the tire pressure warning system 
is initialized, the current tire inflation 

Installing tire pressure warning 
valves and transmitters

NOTICE

■

Repairing or replacing tires, wheels, 

tire pressure warning valves, trans-

mitters and tire valve caps

●

When removing or fitting the wheels, 

tires or the tire pressure warning 

valves and transmitters, contact your 

Lexus dealer as the tire pressure warn-

ing valves and transmitters may be 

damaged if not handled correctly.

●

Make sure to install the tire valve caps. 

If a tire valve cap is not installed, water 

may enter the valve and cause it to 

corrode, possibly leading to the valve 

sticking or air to leak from the tire.

●

When replacing tire valve caps, do not 

use tire valve caps other than those 

specified. The cap may become stuck.

■

To avoid damage to the tire pressure 

warning valves and transmitters

When a tire is repaired with liquid seal-

ants, the tire pressure warning valve and 

transmitter may not operate properly. If a 

liquid sealant is used, contact your Lexus 

dealer or other qualified service shop as 

soon as possible. After use of liquid seal-

ant, make sure to replace the tire pres-

sure warning valve and transmitter when 

repairing or replacing the tire.

Initializing the tire pressure 
warning system