Opel 2014 Insignia Owner's Manual page 216

214 Driving and operating
9 Warning
Make sure that no one is in the
pivot zone of the coupling ball bar.
Risk of body injury.
When releasing the stowed
coupling ball bar, make sure to
stand left of the grip.
Release stowed coupling ball
bar
Pull the grip located left to the number
plate under the rear bumper fascia at
an angle of approx. 45° to the ground.
A buzzing tone sounds as a warning
when the release handle is pulled out
and the ball neck is disengaged.
Take the released coupling ball bar
and raise it up until it engages.
Ensure the coupling ball bar is
correctly engaged and the released
handle is guided back to its hidden
initial position, otherwise the buzzing
tone will not stop.
Stow/hide coupling ball bar
Pull the grip located left of the number
plate under the rear bumper fascia at
an angle of approx. 45° to the ground.