Volvo V70 Owner's Manual page 113

Detachable towbar – mounting the ball section
4. Insert the towball section until there is an
audible click.
7. NOTE! Check that the towball section is
secure by pulling it up, down and back.
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5. Check that the indicator window shows
green.
If the towball section is not fitted correctly then
it must be removed and refitted in accordance
with the previous steps.
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6. Turn the key anticlockwise to the locked
position. Remove the key from the lock.
NOTE! The trailer's safety cable must be
connected to the attachment on the towbar.
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