Digital Radio Receiver (DDR) (if equipped)

WARNING: This page is about a different car, the 2008 Pontiac G8. However, it is still accessible from the selected car via links, so may be relevant.

The DDR receives digital radio reception. Two satellites broadcasts high power digital signals. The DDR houses a modem which processes the high power digital signals transmitted by the two satellites. The processed data is transmitted to the infotainment unit via two audio channels. The DDR is integrated into the vehicle wiring harness and communicates with the infotainment unit via GMLAN. Commanding of the DDR is done at the infotainment unit. The high power digital signals are received by the antenna module of the vehicle even when the satellites are not in full view of the antenna module. In densely populated areas where interference of these high power signals may occur, terrestrial repeaters are used to boost the high power digital signals to much higher levels in order to ensure reception at the antenna module of the vehicle.

The DDR is connected to a fused battery positive voltage circuit. Ground for the DDR is routed with the body wiring harness to the chassis.