Lexus GS 450h2011 Manual page 566

5-2. Steps to take in an emergency
Installing the spare tire
STEP 1
STEP 2
STEP 3
566
GS_HV_U (OM30C14U)
May 21, 2010 2:41 pm
Remove any dirt or foreign matter
from the wheel contact surface.
If foreign matter is on the wheel
contact surface, the wheel nuts
may loosen while the vehicle is in
motion, and the tire may come off
the vehicle.
Install the spare tire and loosely
Tapered portion
tighten each wheel nut by hand to
approximately the same amount.
Tighten the wheel nuts until the
tapered portion comes into loose
Disc wheel 
contact with the disc wheel sheet.
sheet
Lower the vehicle.