2015 CX-5 talk button with aftermarket radio...Help!

Hello, I have a Mazda CX5 with a Pioneer MVH-1400NEX in it, it was installed by the previous owner. I'm looking for whatever I need to be able to use the "talk button" for Siri. The way it is currently wired, some steering wheel buttons work (volume, next/previous track). All the talk button does is lower the volume. Can I make it so the talk button invokes Siri?
 
There will be an aftermarket controller installed (as well as the radio) that will 'read' the buttons and connect to the radio. You'll need to find that module, see what make/model it is, and then look up the install/configure instructions on the web.

Without that information, no one can help you.
 
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