Cadillac 2007 CTS Owner's Manual page 66

2. Put the child restraint on the seat.
3. Pick up the latch plate, and run the lap and
shoulder portions of the vehicle's safety belt
through or around the restraint. The child
restraint instructions will show you how.
Tilt the latch plate to adjust the belt if needed.
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4. Buckle the belt. Make sure the release button
is positioned so you would be able to unbuckle
the safety belt quickly if you ever had to.