Yes if your vehicle was equipped with a sub woofer it will have a separate 8 cavity connector on the back of the radio with four wires in it.
The wire colors are as follows
Pin 1 : Red/black ,Sub woofer high audio +
Pin 2: Brown/orange, Sub woofer high audio -
pin 3: audio shield wire
pin4 : dark green/violet sub woofer high audio mute
These wires also go thru another connector which is a 16 pin connector behind the right front kick panel