I'm installing an aftermarket radio and speakers in my 1994 coupe.I ran all new speaker wire and then tied into the hot wires that the old head unit used for power .The problem i'm having is I cant seem to figure out how to get the power antenna to go up and down.The new radio has a wire for it.Its the blue one.The antenna has three wires going to it. Theresan orange one, a green one and a black one.I dont know but it seems to me that one of the wires needs to have fire on it when you turn the radio off the antenna goes down and one with fire when you turn the radio on. it goes up The other maybe a ground I also had to get an extention for my antenna because the old head unit had no antenna wire . It was connected thru the tuner(CDM) in the storage compartment behind the seat.

The antenna worked with the old unit.

 

You might try this. http://www.corvetteradios.com./Page.html

And don't forget this because your car will need it.

http://www.corvetteforum.net/c4/dave8476/index4.shtml