The following site outlines detail information about Radio Wiring Diagram and Pinouts of Jeep Grand Cherokee 1999 – 2004 model years. Here you will find detail illustration for Radio Connectors of base radio PCI connectors, premium radion with changer C4 and PIC connectors, and Navigation Radio. You will find also Wiring Diagram and Pinouts of base audio system wiring, premium audio system wiring, radio connectors pinouts, CD changer wiring, radio remote control wiring, infinity amplifier pinouts, CD changer pinouts, CD changer adaptor cable, radio adaptor harness, and aftermarket amp power.
Find detail illustration and description of Jeep Grand Cherokee Radio Wiring Diagram and Pinouts here. (source: wjjeeps.com)