Your vehicle has an external Sirius tuner. The newer radio you purchased has an internal Sirius tuner. The external tuner is located on the driver's side kneeboard in most vehicles or behind the glove compartment. See picture below. You'll need to remove both cables going into the module. The cable on the left will hang free and be unused from now on. The yellow plug on the right is plugged into the port on the splitter. The yellow and pink plugs on the other end go into the corresponding ports on the back of the radio.