Volkswagen Golf GTI 2016 Owner's Manual page 369

When using the vehicle safety belt to install a child restraint, you
must activate the switchable locking feature on the safety belt to
help prevent the child restraint from moving → Installing child
restraints with a safety belt .
Push the child restraint down with your full weight to get the safety
belt really tight so that the seat cannot move forward or sideways
more than about 1 inch (2.5 cm).
Important additional information about installing a child restraint
system on the front passenger seat:
If you must install a child restraint on the front passenger seat in
exceptional circumstances, be sure to read and heed the important
information and warnings in the section of this Manual that begins
on → Child restraints and the Advanced Airbag System .
There are also additional adjustments that must be made in order to
be able to properly install a child restraint on the front seat:
Set the safety belt upper anchorage for the front passenger seat so
that the available safety belt is long enough to properly install the
child restraint. Always follow the child restraint manufacturer's
installation instructions → .