Digital Radio Receiver

WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.

The radio communicates with the digital radio receiver (DRR) via the GMLAN data bus. When the radio communicates with the DRR, the virtual network (VN INFOTAINMENT) is activated by the radio. During this communication phase, the radio sends a specific GMLAN frame message to establish a link with the DRR. The DRR responds with a specific frame message back to the radio confirming the link was successful. The scan tool can be used to check if any remote device is connected to the radio. In this case, observe the RSE parameter in the Radio Data Display. The scan tool will indicate RSE - Present. When a XMI or XM2 frequency setting is selected from pressing a button on the radio, a specific GMLAN frame message is sent to the DRR to change to the selected frequency. During XM operation the audio signals are sent over the left and right audio signal circuits from the DRR to the radio.