I am using views 3 with drupal 7x of course.I have a problem.I created two vocabularies one is manufaturer and the other is models which is used autocomple tagging for the term reference.

I have enabled it in views 3 exposed filters.When i select the filter manufacturers it brings up a list of all manufacturers eg Toyota,Honda,Kia and when i select from models when the value of the manufacturer field in exposed filter is Toyota it still brings out models of other brands.How can i restrict it to only show taxonomy terms fields relating to only Toyota.
Drupal developers please advise

Regards
James