I would like to add iPhone integration to an old Honda Accord. Pioneer makes a nice line of radios that integrate well with iPhones. The feature that stands out to me the most is the ability to launch Siri right from the radio itself. You do so by long pressing the call button located towards the left of most of their radios. I am trying to make Siri use in the car the least distracting possible, so I would like the ability to trigger that functionality form the steering wheel. I have some basic soldering skills and I am hoping the call button is just a tactile switch. I can solder some wires to the connectors on the circuit board, and add an external switch to the steering wheel for calls and Siri. That is the plan anyway.
Does anyone have any experience gutting one of these Pioneer radios, and are the switches something I can solder too?