Radio, Stereo, and Compact Disc: Description and Operation
AUDIODESCRIPTION
Several combinations of radio receivers are offered. The audio system uses an ignition switched source of battery current so that the system will only operate when the ignition switch is in the RUN or ACCESSORY positions. An optional navigation radio (RB3) is available on this vehicle. With this system, the operator has the option of choosing a street address, point of interest, trip itinerary and other features outlined in the operator's manual.
The audio system includes the following components:
- Antenna
- Antenna - satellite radio (if equipped)
- Radio noise suppression components
- Radio receiver
- Satellite receiver module (if equipped)
- Speakers
Certain functions and features of the audio system rely upon resources shared with other electronic modules in the vehicle over the Programmable Communication Interface (PCI) bus network. The data bus network allows the sharing of sensor information. For diagnosis of these electronic modules or of the data bus network, the use of a scan tool and the proper Diagnostic Procedures are recommended.
OPERATION
The audio system components are designed to provide audio entertainment and information through the reception, tuning and amplification of locally broadcast radio signals in both the Amplitude Modulating (AM) and Frequency Modulating (FM) commercial frequency ranges.
The available satellite radio system is a subscription based service. Information sent by satellite is transmitted to the roof mounted antenna, then to the satellite receiver module. The operator then has the choice of multiple music/ information channels.
The available navigation radio system receives GPS signals from up to eight satellites to display the position and direction of the vehicle. Map information is supplied through a DVD-ROM. An electronic gyro-sensor and the vehicle's speed sensor enable the system to display the present vehicle position even in locations where GPS signals may be blocked.
When a destination is selected, the navigation system uses information from the map to quickly calculate a route. As the vehicle is driven along the chosen route, the operator is guided with pictorial displays and voice prompts.
The audio system components operate on battery current received through a fuse in the Junction Block (JB) on a fused ignition switch output (RUN-ACC) circuit so that the system will only operate when the ignition switch is in the On or Accessory positions.