This how a integrated my Remote Garage Opener in my 2010 Chevrolet Equinox. Really easy and very fun to do. Be applicalbe to any car ...
Step 1: Soldering
Found with multimeter the right connectors to momentary switch
Step 2: Drill
Drill hole on the side for wires. Close box and plug the momentary switch. Test it.
Remove ceiling consol. Protect it with masking tapes (or not ... up to you). I use dremel. You can use utility knike with multiple pass.
Step 4: Glued!
Install switch and glued it (i use glue because the clips on the switch are small thickness, i canot use them. So I cut them and glued it.)
Step 5: Final Install
Put the remote in the ceiling or use velcros to stack it in place. Replace the ceiling console ... Voilà!