GMC Terrain 2018 Owner's Manual page 46

The hands-free feature will not work
while the liftgate is moving. To stop
the liftgate while in motion use one
of the liftgate switches.
Length of Kick Zone
Kick Motion
Caution
Attempting to move the liftgate
too quickly and with excessive
force may result in damage to the
vehicle.
To operate, kick your foot straight up
in one swift motion under the rear
bumper between the left exhaust
pipe and the license plate, then pull
it back.
Keys, Doors, and Windows
Caution
Splashing water may cause the
liftgate to open. Keep the RKE
transmitter away from the rear
bumper detection area or turn the
liftgate mode to OFF when
cleaning or working near the rear
bumper to avoid accidental
opening.
Do not sweep your foot side
to side.
Do not keep your foot under the
bumper; the liftgate will not
activate.
Do not touch the liftgate until it
has stopped moving.
This feature may be temporarily
disabled under some conditions.
If the liftgate does not respond to
the kick, open or close the
liftgate by another method or
start the vehicle. The feature will
be re-enabled.
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