Vauxhall Insignia Owner's Manual page 190

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.
Be sure to have the coupling ball bar
correctly engaged and the released
handle guided back to its hidden initial
position, otherwise the buzzing tone
will not stop.
Stow/hide 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.
Driving and operating
A buzzing tone sounds as a warning
when the release handle is pulled out
and the ball neck is disengaged.
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