Hi,
My stock Kenwood GX-204JE headunit has decided to go; it's currently outputting sound, responding to controls etc, but not working with my Aux/CDs which I primarily use, I've replaced it with an OEM Mcintosh PF-41131, which powers up just fine, does the CD shuffling during first power on to check how many discs are in, and the controls work just fine (vol, tune, switch mode), however it doesn't output any sound whatsoever, doesn't respond to the steering wheel controls, nor does it appear to tune to any stations - scanning doesn't stop, and manually tuning in does nothing.
From the back, they both have the same pins and connectors, I'm connecting both the antenna and the power/controls which have the same connection type. I'm not sure if anything further is needed such as configuration or some how initialising it? Not seeing anything online.
As far as I am aware this is an unused head unit.