Dash wiring help!

[jonmon6691]

I am trying to wire my garage door opener to the radio control buttons that are currently taking up space on my dash and I was wondering if anyone had a wiring diagram for those buttons or the whole dash or something so I know what wires to use.

 

[SHOZ123]

The redundant controls?

LB/R is for the illumination, Y/BK is hot in run or accessory, BK is ground for the illumination, R is ground to the radio.

 

[jonmon6691]

So the garage door opener has a pressure switch that completes a circuit and and sends the signal. so I was wondering, are there wires that I can connect from the remote radio button harness (The mode, vol, and seek or whatever they are) so that it will complete a circuit when the button is pressed.
I was hoping to accomplish this with the harness that is already in there (As opposed to tearing it apart and using the wires directly off the button's switch)