Volvo XC90 Owner's Manual page 137

Starting and driving
Detachable towbar – removing
OPEN
– Insert the key into the detachable part and
turn it clockwise to the unlocked position.
136
OPEN
– Turn the lever clockwise to the locked
position and grip the towball.
– Pull the towball from the connector pin.
Do not hold the lever.
IMPORTANT!
The lock on the towball can only be
locked when the red plastic pin is not
visible.