If the bose system amp output uses the same as every other gm ever then its

LF Speaker +/- tan - gray
RF Speaker +/- lt. green - dk. green
LR Speaker +/- brown - yellow
RR Speaker +/- dk. blue - lt. blue


You can test them with a AA battery, just run that 1.5 volts into the wires.
The speakers you hit with it will make a small pop. and 1.5v wont hurt anything.