My Mazda3 has it.... Here is a picture I found on the web The left side is for audio, the right for cruise control. I can control the volume with the big button on the left. The 2 smaller buttons on the right of the volume (top) are for changing radio stations/ CD tracks. The button below is for switching between the AM, FM, Satellite radio and CD and the last button is for mute Maybe you could rig something up like that in your wagon?