Buick 2004 Rainier Owner's Manual page 370

3. Put the spare tire near the flat tire.
4. Position the chisel end of your wheel wrench in the
notch of the center cap and pry off the center cap.
See "Removing the Flat Tire and Installing the
Spare Tire" later in this section to continue changing
the flat tire.
5-82
Secondary Latch System
Your vehicle has an underbody mounted tire hoist
assembly equipped with a secondary latch system.
It's designed to stop the spare or flat road tire
from suddenly falling off your vehicle if the cable holding
the spare tire is damaged. For the secondary latch to
work, the tire must be stowed with the valve stem
pointing up. See "Storing a Flat or Spare Tire and Tools"
for instructions on storing the spare or flat tire correctly.
CAUTION:
{
Before beginning this procedure read all the
instructions. Failure to read and follow the
instructions could damage the hoist assembly
and you and others could get hurt. Read and
follow the instructions listed below.