Each speaker has a positive (+) and a negative (-) wires.
Front Left speaker: (+) orange/gray or green, (-) black/ white
Front Right speaker: (+) white/ green, (-) black/ white
Rear Left speaker: (+) pink/ green, (-) pink/ blue
Rear Right speaker: (+) pink/ blue, (-) green/ orange
Rear Left and Rear Right speakers both have pink/blue wires. Hook them up one way and if it don't play in those speakers then switch them and should play just fine.