It's not. The OEM radio does not have a way to select between the 2. Both will be on and trying to interface themselves with the radio.
Actually I have to disagree with Lewis on this one that iPod unit is factory addressed as CD2 the OEM CD changer is CD1 you flip between them by toggling the CD button it even comes with a Y cable.It's not. The OEM radio does not have a way to select between the 2. Both will be on and trying to interface themselves with the radio.
Yes I actually discovered it worked before I read how I guess I need to try programming the OEM box to CD2 and connecting a V3 playerPete,
I had read the installation instructions on one I installed early on and they stated that if you had a CD player it had to be disconnected. The "Y" cable was for vehicles with NAV so you would not lose the navigation functions. If the later versions had a change, I wasn't aware of the ability to have a CD1 and a CD2.