Toyota Yaris Owner's Manual page 428

428
8-2. Steps to take in an emergency

The compact spare tire

The compact spare tire is identified by the label "TEMPORARY USE ONLY"
on the tire sidewall.
Use the compact spare tire temporarily, and only in an emergency.

Make sure to check the tire inflation pressure of the compact spare tire.
(P. 483)

After completing the tire change (vehicles with a tire pressure warning
system)
The tire pressure warning system must be reset. (P. 348)

When using the spare tire (include compact spare tire) (vehicles with a
tire pressure warning system)
As the spare tire is not equipped with a tire pressure warning valve and trans-
mitter, low inflation pressure of the spare tire will not be indicated by the tire
pressure warning system. Also, if you replace a flat tire with the spare tire
after the tire pressure warning light comes on, the light remains on.

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. Per-
form the following steps and fit tire chains to the front tires:
1
Replace a rear tire with the compact spare tire.
2
Replace the flat front tire with the tire removed from the rear of the vehi-
cle.
3
Fit tire chains to the front tires.