I have searched this forum and haven't found the answer. How do you get Siri Hands Free to work on a 4000NEX? 

Siri Hands Free is available from iOS 8 when you can say "Hey Siri" as it's always listening. If you're talking about Siri Eyes Free which still requires a button press then hold down the centre button (the one with four squares) until it does the Siri noise.

I use it from the phone dialer menu.  I just press the small icon on the bottom left that looks like it's for voice command and it should fire up siri.  Use it as you normally would.

Hey guys, been a lurker for a few weeks but haven't posted yet. I made a hasty video a while back demonstrating the "Hey Siri" feature with a 4000NEX for my post on Audizine, so I thought I might as well share it here too.

Here it is:

Thanks, it shows touching the screen on pioneer site. I figured it out on way to work.

You can also do a long press on the physical home screen button (the one in the middle). Hold it for a few seconds and you'll hear a double beep. Then, you can talk to Siri.

Thanks for all your help.

Dont respond to spam on this forum. Report it if you want to help.

I did report it as soon as i saw it.

I am aware and thank you. I just dont want to legitamize this stuff by responding to it.