Read the small print "Depending on Version"
And? The manual entertains a magnitude of models, versions and Model Years. Without knowing exactly what the OP has, pointing him towards and quoting the manual is probably the smartest thing?
To add and be helpful - The (a) refers to the switch in a central position, so not clicked towards '0' or the light symbol - OR - if the model doesn't have a 'central position', it will activate via a door opening.