I've seen switch modules for sale on E*Bay, and am wondering if I can add a switch to my existing panel to use for my garage door remote. There are currently only three spots occupied, lock and the two window controls.

 

Sorry but the "General" answer is no, the switch's are directly connected to a circuit board and that is connected to the BCM (Body Control Modual)

 

So there's a circuit board 'in the way?' I've had the unit out to install the Ian Cull circuit (which has quit working--why I need another way to control my GDO), but didn't open it.

 

Here are Ian Cull's photos of inside the toggle panel: https://margaretandian.com/2005/04/2..._switch_panel/

The "toggle switches" are simply levers that press on contact spots on the circuit board. Some people have drilled out a blank position and mounted an aftermarket switch.