Hummer H3. Manual — part 1217

DESCRIPTION AND OPERATION

NAVIGATION SYSTEM DESCRIPTION AND OPERATION

Navigation System Description and Operation

Navigation System Components

The navigation system contains the following components:

Navigation radio

Global Positioning System (GPS) antenna

Navigation Radio

This component acts as the operator interface for the audio system, provides the data input from
the operator to the navigation system and provides navigation information to the operator via the
display screen. The navigation radio, located in the center of the instrument panel, provides the
following:

A display screen-All navigation and audio functions are displayed on this screen.

The navigation system map with routing information displayed on the navigation radio
screen

Audio system options and controls, displayed on the navigation radio screen

Provides verbal guidance to the operator

3

Tighten: 2 N.m (18 lb in)

4

Radio Speaker Amplifier
Tip: Disconnect the electrical connector.

Navigation Display Head

Controls

Function

Power

Push PWR/VOL knob to turn the radio ON

NAV

Displays the map guidance screen

NAV RPT

Repeats the last voice guidance message

SETUP

Displays the setup function for the navigation radio

Soft Key Buttons

Push to select the options listed on the navigation screen

EJECT

Push and hold the eject button to tilt open the radio face plate
and expose the map DVD slot

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

The DVD provides the map data for navigation and map route guidance

Connection to the global positioning system (GPS) antenna, which provides the vehicle
position information

Global Positioning System (GPS) Antenna

The global positioning system (GPS) antenna is located at the top center of the dash pad. The
GPS antenna is powered through the same coaxial cable used to send the signals to the navigation
radio. The GPS antenna collects data from the GPS satellites and routes this information to the
navigation radio to be formatted into current position.

GPS Reception

The global positioning system (GPS) shows the current position of the vehicle. Tall buildings,
large trucks or a tunnel can obstruct GPS signals. Metallic objects on the dash can also cause
interference. A GPS icon is located in the top left corner of the map display. If the GPS is valid,
the icon will be green if not the icon will be gray. The GPS info screen will also show the
condition of the GPS. If GPS reception in not received, it will show out of range. If the reception
is received, the coordinates of your location will be shown.

Route Guidance

The map will display the route to the selected destination. Voice prompts alert the operator of
upcoming events (turns) and arrivals at the destination. The navigation system will automatically
recalculate if the route is not followed. The navigation radio uses data received from the global
positioning system (GPS) satellites as well as the vehicle speed signal to accurately display the
current position of the vehicle.

Points of Interest (POI)

Points of interest (POI) are locations that are frequently visited. Points of interest can be
displayed on the map or set as a destination. The following is a few of the available POI:

Gas station

Restaurant

Museum

College

Police

Map DVD

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

The map DVD slot is located behind the radio face. Press and hold the eject button for
approximately 15 seconds and the radio face will tilt open and allow access to the map/DVD slot.
Press the eject button again to close the radio face.

ONSTAR DESCRIPTION AND OPERATION

Dialing a Phone Number Hands-Free

Dialing a Phone Number Using Digit Dial

Dialing a Phone Number Using Stored Nametag

Dialing A Phone Number Using "Redial" Command

General Tips for Better Speech Recognition

Personal Calling Commands

This vehicle uses the Generation 6 version of the OnStar® system. This system consists of the
following components:

Vehicle communication interface module (VCIM)

OnStar® button assembly

Microphone

Cellular antenna

Navigation antenna

This system also interfaces with the factory installed vehicle audio system.

New Features

New Features for this version of OnStar® include Turn by Turn Navigation and the Advisor
Record Feature. Turn by Turn Navigation allows the driver to contact OnStar® to obtain
directions for driving from a current location to a desired location. The Turn by Turn Navigation
system stores your planned route and continually checks your position along that route, when you
deviate from the planned route, the system will recognize this and prompt the driver with verbal
prompts for how to proceed. The driver then responds verbally to direct the system to continue
the current routing or to recalculate the route because of a missed turn. Turn by Turn Navigation
instructions are displayed to the driver by the radio display or the driver information center
(DIC). The Advisor Record Feature allows the driver to store any information given to you
during a call with an OnStar® Advisor.

Vehicle Communication Interface Module (VCIM)

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

The vehicle communication interface module (VCIM) is a 3-watt cellular device that allows the
user to communicate data and voice signals over the National Cellular Network. It is powered by
a fused, battery positive voltage circuit, connected through vehicle wiring to the 3-button
assembly and the radio and attached by means of coax cables to the cellular and navigation
antennas. Ground for the module is accomplished by means of dedicated circuits that are routed
with body wiring systems to chassis ground points. The module houses 2 modems, one to process
global positioning system (GPS) data and the other for cellular information. Satellites orbiting
earth are constantly transmitting signals of their current location, from which the OnStar® system
is able to pinpoint its own location. The navigation antenna receives these GPS signals and
provides the data to the VCIM to be processed. The VCIM communicates with the rest of the
vehicle over the class 2 serial data bus. Ignition state is determined by the VCIM through class 2
messaging. The module also has the capability of commanding the horn, door lock/unlock and
operating the exterior lamps using the class 2 serial data circuit. When an OnStar® keypress is
made, a class 2 message is sent to the audio system to mute all radio functions and transmit
OnStar® originated audio. After the audio system is muted, the OnStar® signals are transmitted
to the audio system on the cellular telephone voice signal circuit and returned to the module on
the cellular telephone voice low reference circuit. The cellular modem connects the OnStar®
system to the cellular carrier's communication system by interacting with the national cellular
infrastructure. The module sends and receives all cellular communications over the cellular
antenna and cellular antenna coax.

OnStar® Button Assembly

The OnStar® button assembly may be part of the rearview mirror on some vehicles or a separate
unit on others. The button assembly is comprised of 3 buttons and a status LED. The buttons are
defined as follows:

The Answer/End Call button, which is black with a white dot, allows the user to answer and
end calls or initiate the personal calling feature, if equipped.

The blue OnStar® Call Center button, which displays the OnStar® logo, allows the user to
connect to the OnStar® Call Center.

The Emergency button, which will display either a red or white cross, sends a high priority
emergency call to the OnStar® Call Center when pressed.

The vehicle communication interface module (VCIM) supplies 10 volts to the OnStar® button
assembly, on the keypad supply voltage circuit. When pressed, each button completes a circuit
across a resister allowing a specific voltage to be returned to the vehicle communication interface
module (VCIM) on the keypad signal circuit. Depending upon the voltage range returned, the
VCIM is able to identify which button has been pressed.

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3