Pontiac 1999 Montana Owner's Manual page 85

To remove the child restraint, just unbuckle the vehicle's
safety belt and let it go back all the way. The safety belt
will move freely again and be ready to work for an adult
or larger child passenger.
Securing a Child Restraint in the Center
Seat Position (Third Row Bench Seat)
You'll be using the lap belt. Be sure to follow the
instructions that came with the child restraint.
Secure the child in the child restraint when and
as the instructions say.
See the earlier part about the top strap if the child
restraint has one.
1. Make the belt as long as possible by tilting the latch
plate and pulling it along the belt.
2. Put the restraint on the seat.
3. Run the vehicle's safety belt through or around the
restraint. The child restraint instructions will show
you how.
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