Principles of Operation

PRINCIPLES OF OPERATION

Navigation System
The navigation system module controls the operation and the interface between the user, the vehicle subsystems, and the external components. The navigation system module is on the controller area network (CAN) and can be diagnosed with a diagnostic tool. Communication through the CAN uses data transmitted and received between the navigation system module and the audio unit to control the video screen display through the video interface circuits.

The vehicle navigation system guides the user to a pre-entered destination. A map digital versatile disc (DVD) stored in the navigation system module (located in the center console) sends route calculation data to the audio unit. The audio unit display audibly and visually instructs the user of the maneuvers required to arrive at the destination entered.

A voice recognition system allows the user to interface with the system without using the touch screen. A microphone located in the rear view mirror provides a direct input to the navigation system module.

In order to calculate initial vehicle position, the global positioning system (GPS) antenna is used to track several available satellites simultaneously. The GPS antenna only receives data; it does not communicate with the satellites. A gyroscope integral to the navigation system module monitors the pitch and yaw of the vehicle created during cornering or turning. A hardwired vehicle speed input from the anti-lock brake system (ABS) module and a reverse input from the digital transmission range (TR) sensor through the CAN network are also used to detect vehicle speed and direction changes.

Self Diagnostics







Although on the CAN network, the navigation system provides internal diagnostics to assist with diagnosing vehicle concerns.







Press and hold the AUDIO and MENU buttons for 5 seconds.







Press 917 Enter.

- SELF CHECK provides internal self-test diagnostics. These DTCs are also accessible through the CAN network using a diagnostic tool.
- NAVIGATION INFO provides access to speed signal, gyro, reverse input and GPS information.
- SUB-SYSTEM INFO provides the various component configurations.
- MANUAL CHECK provides access to several diagnostics input tests:
- Voice Output verifies the audio signals from the navigation system module and audio unit.
- Hard Switch Test checks the various switches.
- Microphone Test checks the strength of the voice signal.