The rear deck speakers ARE the subwoofers, there are right and left sub outputs from the amp, if your trying to get a sub output to run another amp you would have to combine both the left and right sub outputs, to get a "center" sub output, you could use line output converters on each output, right and left sub and then combine the outputs of the loc's, the + outputs are: left sub=blue/gray right sub green/violet, note combining the outputs can cause some cancelation of the bass signal, an alternative is use just right or left alone since the amp likely mixes them some anyway, there are no outputs from the radio--even audio and remote power on to the rear amp is sent down a serial DATA bus called a MOST bus, bottom line, only options are a aftermarket adaptor that will give you the outputs the amp needs OR open the rear amp up and create your own remote on and center sub outputs--which is possible but would require electronics knowledge--everything is data driven nowadays !!
