I believe the aux. ventilation became standard in '02 or '03 -- I can't remember which. On '01 models, it was available if you ordered the 'high level' on board computer (includes a dot-matrix display in your gauge cluster) and climate control. With Navigation, both of those items are included. Again, that statement is for '01 models only. I think in '02 or '03 the 'high level' on board computer became standard.