Pontiac 2005 Montana Owner's Manual page 405

To release the spare tire from the secondary latch, do
the following:
1. Place the jack under the vehicle, ahead of the rear
bumper. Position the center lift point of the jack
under the center of the compact spare tire.
2. Turn the folding wrench clockwise to raise the jack
until it lifts the secondary latch device under the
wheel plate.
3. Keep raising the jack until the compact spare tire
stops moving upward and is held firmly in place,
this lets you know that the secondary latch
has released.
4. Lower the jack by turning the folding wrench
counterclockwise. Keep lowering the jack
until the compact spare tire is resting on the
folding wrench.
5. Grasp the compact spare tire with both hands and
pull it out from under the vehicle.
6. Reach under the vehicle and remove the folding
wrench and jack.
Have the hoist assembly inspected as soon as you can.
You will not be able to store a spare or flat tire using
the hoist assembly until it has been repaired or replaced.
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