I use to have a AVH-P5700DVD. One thinks i liked was that i could hit one button and it would turn on my subs. Dose the AVIC-D3 Have the options?

yes it also lets you set how loud you want the subs to be.... and if you have the subs reversed it has the option for that

I have tried all the buttons, and using a combo of them. Which one is it.

in the d3.... menu...sound...subwoofer.... its in the same menu that your eq settings are

o i think im a little confused... do you mean an actual hard button on the d3 or just an option to turn them off.... if you want just one button to turn them off the d3 doesnt have that... you can make a switch to turn off your amp for the subs.... sorry for the confusion