Where is the aux in a 2005 Pontiac vibe?

The 2005 Pontiac Vibe doesn't have a standard auxiliary input jack in the way many modern cars do. To connect an external audio device, you'd likely need to use a cassette adapter (if it has a cassette player) or connect to the CD changer input using a special adapter cable (if equipped). Some higher trim levels *might* have had an optional upgraded stereo system with an aux input, but it wasn't standard. Check your owner's manual for specifics on your radio model.