Just pulled this out of my PDF manual.
don’t know if you’ve already read the same but, if not, it might help.
Opening the liftgate
If the vehicle has satisfied all the
following operation conditions, the
power liftgate can be opened using the
power function.
x All doors and the liftgate are
unlocked.
x The vehicle is stopped.
x (Manual transmission)
The ignition is switched to a position
other than ON, or when the parking
brake is applied with the shift lever in
N and the ignition switched ON.
x (Automatic transmission)
The ignition is switched to a position
other than ON, or the selector lever
is in P with the ignition switched ON.
Closing the liftgate
x The vehicle is stopped.
x (Manual transmission)
The ignition is switched to a position
other than ON, or when the parking
brake is applied with the shift lever in
N and the ignition switched ON.
x (Automatic transmission)
The ignition is switched to a position
other than ON, or the selector lever
is in P with the ignition switched ON.
NOTE
x (Manual transmission)
If the vehicle moves with the shift lever
shifted to a position other than N
while the liftgate is opening/closing
electrically, the liftgate moves as
follows:
While opening electrically
The buzzer is activated, and the
liftgate moves in the reverse direction
automatically and closes. When the
shift lever is shifted to N and the
parking brake is applied, you can
resume the power liftgate operation
using the switches.
While closing electrically
The buzzer is activated, but the liftgate
continues closing.
x (Automatic transmission)
If the vehicle moves with the selector
lever shifted to a position other than P
while the liftgate is opening/closing
electrically, the liftgate moves as
follows:
While opening electrically
The buzzer is activated, and the
liftgate moves in the reverse direction
automatically and closes. When the
selector lever is shifted to P, you can
resume the power liftgate operation
using the switches.
While closing electrically
The buzzer is activated, but the liftgate
continues closing.
Operation from the driver's seat (To
open/close)
Press the power liftgate switch for
about 1 second or longer while the
liftgate is in the fully closed/open
position. The hazard warning lights
flash twice and the liftgate opens/
closes fully after a sound is activated.
Operation from outside (To open)
Press the electric liftgate opener on the
liftgate. The hazard warning lights flash
twice and the liftgate opens
automatically after the beep sound is
heard.
(With the advanced keyless function)
A locked liftgate can also be opened
while the key is being carried.
Operation from outside (To close)
Press the power liftgate close switch
while the liftgate is fully opened. The
hazard warning lights flash twice and
the liftgate closes automatically after
the beep sound is heard.
Before Driving