Diono mXT Instruction Manual page 12

8) Tighten the seatbelt by pulling the diagonal shoulder belt portion in the
direction of the arrows.
9) Confirm seatbelt buckle is in correct position (see below).
WARNING:
If lap portion and diagonal portion of seatbelt are not
positioned correctly, the booster seat is not properly installed:
• Diagonal portion of seatbelt should lay over the shoulder and
touching the neck. (Fig. 6)
• Lap belt position should be forward and as low as possible over child's
pelvis and contacting the upper thigh.
If there is any question about the above instructions, please contact the
booster seat manufacturer.
Proper Buckle Position
IMPORTANT:
After booster seat is installed and seatbelt is fastened around
child, it is important to confirm correct seatbelt buckle position to ensure
secure installation.
Correct seatbelt buckle position: Buckle is on the outside of lower belt
guide. (Fig. 6 and Fig. 8)
INCORRECT SEAT BELT BUCKLE POSITION:
If buckle is being pulled across the lower belt guide and into the seat (Fig. 8),
choose another seating position within the vehicle.
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