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 shelf behind the rear seats.
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 tether strap over the child restraint seatback. Route the tether strap under the head restraint and between the head restraint posts, or route the tether strap over the top of the vehicle seatback. Make sure the strap is not twisted.
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Connect the tether strap hook to the tether anchor, then tighten the tether strap according to the child seat manufacturer's instructions to firmly secure the child restraint 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.