Securing a child restraint seat with "Tether Anchor" system

First secure the child restraint with the LATCH lower anchors or the seat belt. If the child restraint manufacturer recommends that the top tether strap be attached, attach and tighten the top tether strap to the top tether strap anchor.
Child Restraint hook holders are located on the seat back.
Take the following precautions when installing the tether strap:
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Read and follow all installation instructions provided with your Child Restraint System.
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NEVER attach more than one child restraint to a single tether anchor. This could cause the anchor or attachment to come loose or break.
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Do not attach the tether strap to anything other than the correct tether anchor. It may not work properly if attached to something else.
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Do not use the tether anchors for adult seat belts or harnesses, or for attaching other items or equipment to the vehicle.
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Always fasten the seat belts behind the child restraint seat when they are not used to secure the child seat. Failure to do so may result in child strangulation.
To install the tether anchor:

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Route the Child Restraint System seat strap over the seatback.
For vehicles with adjustable headrest, route the tether strap under the headrest and between the headrest posts, otherwise route the tether strap over the top of the seatback.
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Connect the top-tether to the top-tether anchorage, then tighten the top-tether according to the instructions of your Child Restraint System's manufacturer to firmly attach the Child Restraint System to the seat.
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Check that the child restraint is securely attached to the seat by pushing and pulling the seat forward and from side-to-side.