Yes, if you have the Bose system, the head unit sends out low level output (~4V preouts).
The wires should be (+,-)
LF: Yellow, Brown - Pin 2, 3
RF: Green, Red - Pin 11, 12
LR: Pink, Blue - Pin 4, 5
RR: Brown, Yellow - Pin 13, 14
They are in the 20-pin connector at the radio.