IS350 AWD/IS350/IS300- Page 299

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6-3. Do-it-yourself maintenance

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If this accidentally occurs, either turn the 

engine switch to off and then to IGNITION 

ON mode, or initialize the system after 

checking that the tire pressure is properly 

adjusted.

Your vehicle is equipped with a tire 
pressure warning system that uses tire 
pressure warning valves and transmit-
ters to detect low tire inflation pressure 
before serious problems arise.



The tire pressure detected by the 
tire pressure warning system can be 
displayed on the multi-information 
display.



If the tire pressure drops below a 
predetermined level, the driver is 
warned by a screen display and a 
warning light. (



P.333)

■

Routine tire inflation pressure checks

The tire pressure warning system does not 

replace routine tire inflation pressure 

checks. Make sure to check tire inflation 

pressure as part of your routine of daily 

vehicle checks.

■

Tire inflation pressure

●

It may take a few minutes to display the 

tire inflation pressure after the engine 

switch is turned to IGNITION ON mode. 

It may also take a few minutes to display 

the tire inflation pressure after inflation 

pressure has been adjusted.

●

Tire inflation pressure changes with tem-

perature. The displayed values may also 

be different from the values measured 

using a tire pressure gauge.

■

Situations in which the tire pressure 

warning system may not operate prop-

erly

●

In the following cases, the tire pressure 

warning system may not operate prop-

erly.

• If non-genuine Lexus wheels are used.

• If a tire has been replaced with a tire that 

is not an OE (Original Equipment) tire.

• If a tire has been replaced with a tire that 

is not of the specified size.

• If tire chains, etc. are installed.

• An auxiliary-supported run-flat tire is 

equipped.

• If a window tint that affects the radio wave 

signals is installed.

• If there is a lot of snow or ice on the vehi-

cle, particularly around the wheels or 

wheel housings.

• If the tire inflation pressure is extremely 

higher than the specified level.

• If tires not equipped with tire pressure 

warning valves and transmitters are used.

• If the ID code on the tire pressure warn-

ing valves and transmitters is not regis-

tered in the tire pressure warning 

computer.

●

Performance may be affected in the fol-

lowing situations.

• When driving near a TV tower, electric 

power plant, gas station, radio station, 

large display, airport or other facility that 

generates strong radio waves or electri-

cal noise

• When carrying a portable radio, cellular 

phone, cordless phone or other wireless 

Tire pressure warning system