Volume not working after replacing power/flex cable?

So, I've "successfully" replaced the power/volume flex cable in my 4th gen iPod touch... the power button obviously works, but the volume up/down buttons do not. I'm thinking that maybe one of the pads isn't making a good connection, but I'd like to see a diagram of the function of each pad; I'd like to not un-solder the ones that are good. Does anyone know where I can find a wire schematic for this ribbon cable?