Toyota 2012 Yaris Hatchback Owner's Manual page 301

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If you have a flat front tire on a road covered with snow or ice
Install the compact spare tire on one of the rear wheels of the vehicle.
Perform the following steps and fit tire chains to the front tires:
Replace a rear tire with the compact spare tire.
Replace the flat front tire with the tire removed from the rear of
the vehicle.
Fit tire chains to the front tires.
CAUTION
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When using the compact spare tire
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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.
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Do not use more than one compact spare tire simultaneously.
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Replace the compact spare tire with a standard tire as soon as possi-
ble.
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Avoid sudden acceleration, deceleration and braking, as well as sharp
cornering.
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When storing the compact spare tire
Be careful not to catch fingers or other body parts between the compact
spare tire and the body of the vehicle.
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When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following sys-
tems may not operate correctly:
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ABS
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Brake assist
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VSC
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TRAC
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Cruise control (if equipped)
5-2. Steps to take in an emergency
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