You don't have to have a external cd changer. You have to have cd changer controls on the OEM HU. Any time you see a radio with any controls other than fm or internal cd, they use a aux port. The key to using a aux port is knowing what language the head unit uses to communicate with. Otherwise known as a bus transmission. Example: a kenwood HU won't be able to communicate with a alpine. The Pac is a box used to translate between the ipod or other device. If the HU doesn't have cd changer controls or xm radio it won't have a aux port to use.
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 2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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