Q:
A: I quote now from page 109 of the owner's manual for the Peugeot 406: ....' Child Locks: Both rear doors are equipped with a child lock to prevent the opening from inside. Turn the knob/button a quarter turn with your car key.' Then there is a drawing , with an arrow pointing towards the knob/button on the inner, hidden door surface just a few inches below the level of the outside handle. I would say above knee-height.