Lexus 2015 RX350 Owner's Manual page 751

If non-genuine Lexus wheels are used (Even if you use Lexus wheels, the tire
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pressure warning system may not work properly with some types of tires.)
If tire chains are used
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Vehicles with a full-size spare tire: If the spare tire is in a location subject to poor
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radio wave signal reception
Vehicles with a full-size spare tire: If a large metallic object which can interfere
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with signal reception is put in the luggage compartment
If the tire pressure warning light frequently comes on after blinking for 1 minute
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If the tire pressure warning light frequently comes on after blinking for 1 minute
when the "ENGINE START STOP" switch is turned to IGNITION ON mode, have
it checked by your Lexus dealer.
Customization
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The vehicle speed linked seat belt reminder buzzer can be disabled.
(Customizable features P. 834)
CAUTION
When the electric power steering system warning light comes on
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The steering wheel may become extremely heavy.
If the steering wheel becomes heavier than usual when operating, hold firmly and
operate using more force than usual.
If the tire pressure warning light comes on
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Be sure to observe the following precautions. Failure to do so could cause loss of
vehicle control and result in death or serious injury.
Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pres-
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sure immediately.
If the tire pressure warning light comes on even after tire inflation pressure adjust-
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ment, it is probable that you have a flat tire. Check the tires. If a tire is flat, change
it with the spare tire and have the flat tire repaired by the nearest Lexus dealer.
Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you could
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lose control of the steering wheel or the brakes.
If a blowout or sudden air leakage should occur
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The tire pressure warning system may not activate immediately.
5-2. Steps to take in an emergency
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