When working with any circuit like this, use the continuity tester feature on your multimeter and make sure you know the common and what is going on. Pick pairs of wires and start pressing buttons. I like buzzing out unknown combinations like that. You can do the reverse with LED matrices by providing current and ground, one of them through a 470 ohm resistor or so, and simply testing out the combinations. You don't need no stinkin' datasheet for these types of devices, it's a very easy puzzle to solve.