Circuit/System Description
WARNING: This page is about a different car, the 2013 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
The navigation antenna is connected to the telematics communication interface control module and the radio through the navigation signal splitter. The navigation signal splitter distributes the navigation signal to both the telematics communication interface control module and the navigation radio. The telematics communication interface control module supplies 5 V through the coax cable to power the internal antenna amplifier through the signal splitter. The radio supplies 5 V through the center conductor of the coax cable to power the splitter.