Lexus 2012 RX450h Owner's Manual page 907

If you have a flat front tire on a road covered with snow or ice (vehicles with a
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compact spare tire)
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.
STEP 1
Replace the flat front tire with the tire removed from the rear of the vehi-
STEP 2
cle.
Fit tire chains to the front tires.
STEP 3
After completing the tire change
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The tire pressure warning system must be reset. (P. 774)
5-2. Steps to take in an emergency
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