Lexus RX450H Manual page 642

5-2. Steps to take in an emergency
CAUTION

When using the compact spare tire

Remember that the compact spare tire provided is specifically designed
for use with your vehicle. Do not use your compact spare tire on another
vehicle.

Do not use more than one compact spare tire simultaneously.

Replace the compact spare tire with a standard tire as soon as possible.

Avoid sudden acceleration, abrupt steering, sudden braking and shifting
operations that cause sudden engine braking.

When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following systems
may not operate correctly:

ABS & Brake assist

VSC

TRC

VDIM

Lexus parking assist-sensor (if equipped)

Navigation system (if equipped)

Cruise control (if equipped)

Dynamic radar cruise control (if equipped)

Electronically modulated air suspension (if equipped)

PCS (Pre-Crash Safety system) (if equipped)
Also, not only can the following system not be utilized fully, but it may even
negatively affect the drive-train components:

AWD system (if equipped)

Speed limit when using the compact spare tire
Do not drive at speeds in excess of 80 km/h (50 mph) when a compact spare
tire is installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failure to
observe this precaution may lead to an accident causing death or serious
injury.
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