Volvo S80 Owner's Manual page 105

Remove the connector pin cover.
PUSH
TO
LOCK
Grasp the towbar.
Push the part with the ball in until it locks.
NOTE! The lever changes position quickly.
104
OPEN
Insert the key and turn it clockwise to the
unlocked position.
RED PIN (B)
NOT VISIBLE!
Check that the signal pin (B) is pushed in.
OPEN
LOCKED
Turn the key anticlockwise to the locked
position and remove it from the lock.