Lexus IS F 2012 Owner's Manual page 492

5-2. Steps to take in an emergency
The compact spare tire
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The compact spare tire is identified by the label "TEMPORARY USE ONLY"
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on the tire sidewall.
Use the compact spare tire temporarily only in an emergency.
Make sure to check the tire inflation pressure of the compact spare tire.
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(P. 521)
When using the compact spare tire
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As the compact spare tire is not equipped with the tire pressure warning valve and
transmitter, low inflation pressure of the spare tire will not be indicated. Also, if you
replace the compact spare tire after the tire pressure warning light comes on, the
light remains on.
After completing the tire change
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The tire pressure warning system must be reset. (P. 411)
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