Buick 1993 Century Owner's Manual page 56

Don't use the special infantkhild seat
attaching hardware in another vehicle. If you
do, it may not work well and the child may not
be protected properly in a crash. The special
hardware is for your vehicle only.
Also, don't use the special belt for anything
but securing a child restraint in the right front
seat. If an adult or older child uses it, the belt
won't provide protection and may even
increase injury in a crash.
Once the special hardware is installed, please follow the
instructions with it and these steps:
1. Unbuckle the automatic lap-shoulder belt by pushing
the button on the buckle. It will stay on the door,
ready to be rebuckled for use by adults or older
children.
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