2005 toyota corolla diagrams online?

I need help finding a diagram for the center dash ( where the stereo heating and air, and plug outlet ect is). I just installed a new stereo and now my control to set the vents to defrost or floor ect. is not switching over. It turns but does not switch over. Also where I put the car into drive park ect. is not lighting up anymore. A friend of mine helped put it back together but I think he broke something. I just need to find some pics or diagrams so I can get back in there and fix it. I do not have the $$$ to get the haynes service manual.