Pioneer DEH-1400 CD Player "convenience closing feature" Questions

Looking to use iPod, no manual to tell how to switch to the addaptor Just got a a car that has this system, but I have no manual for it. I'd like to be able to use my iPod via adaptor but im not sure ...

connect ipod to cd player wit built in aux input. i just bought a cable to connect my 30gb ipod video to my pioneer deh-7800mp cd player. i plugged the cable into my ipod and in the built in aux. in ...