Pontiac 2003 Montana Owner's Manual page 86

Securing a Child in the Built-In Child
Restraint
1. Raise the head restraint until the lower edge of the
head restraint is even with the top of the seatback.
1-80
2. Rotate the head restraint rearward until it touches
the top of the seatback. Make sure there is no gap
between the lower edge of the head restraint
and the top of the seatback.