DVD Player wiring

I am connecting a factory OEM DVD Video system in my '03 Caravan and do not know what a couple of the wiring connections mean.
Does anyone know what the J1850 connection is and where I connect this to?

The other one I am having trouble with is ILL(PWDM). I can guess that this may be for the Illumination dimmer but am not sure.

I got these from the wiring diagram on a sticker from the DVD player.

Can anyone help as to what these mean?

Thanks!!