Circuit/System Description
WARNING: This page is about a different car, the 2009 Cadillac STS. 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 a digital radio antenna located on the outside of the vehicle. The signal is passed to the DRR through digital radio antenna coax. From the DRR, one audio common (-) and separate left and right audio signals (+), are sent to the radio. The radio processes these signals and passes the audio to the appropriate speakers or audio amplifier.