Circuit/System Description
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
The digital radio receiver (DRR) receives XM satellite radio signals via 2 digital radio antennas located in each of the outside rearview mirrors. The antenna circuits are coaxial cables that carry the digital radio signal information received by the antennas to the DRR. The antenna coax also provides a path for voltage to power the antennas. Separate left and right audio signals (+) are sent from the DRR to the radio. The radio processes these signals and passes them to the audio amplifier.