For anyone that wants to know about the factory GD1 stereo plugs..

[JRHPNG]

I just installed a factory Honda Navi so decided to pull apart the factory radio...

If anyone has wondered what each pin in the plug is for the lovely folk that manufactured the circuit board were lovely enough to label them...



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[guest1372]

That Park connection might be one worth modifying depending on what it stops you doing while moving. Probably just needs to be taken to 12v or ground to permanently enable it. The CD changer port looks like it has a Can-Bus connection as suspected, but the audio connection is straightforward although the plug and compatible ones will be more difficult to source.
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TG