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Chevrolet Silverado / GMC Sierra. Manual - part 2247
Fig. 36: Rear Pillar Speaker Replacement
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
Preliminary Procedure:
Remove the body lock pillar trim. Refer to Body Lock Pillar Trim Replacement (Crew
Cab) or Body Lock Pillar Trim Replacement (Regular Cab) or Body Lock Pillar
Trim Replacement (Extended Cab) .
1
Rear Pillar Speaker Screw
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
DESCRIPTION AND OPERATION
NAVIGATION SYSTEM DESCRIPTION AND OPERATION
Operator Controls
Navigation System Components
The navigation system contains the following components:
Navigation radio
Global positioning system (GPS) antenna
Auxiliary RCA video jacks
Navigation Radio
This component acts as the operator interface for the navigation 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 is located in the center of the instrument panel. The
navigation radio provides the following:
A display screen-All navigation, audio and TV functions are displayed on this screen.
Soft key buttons on the display to allow selection from menus and to operate the navigation
system and the audio system
The navigation system map with routing information displayed on the navigation radio
screen
Tighten: 3 N.m (25 lb in)
2
Rear Pillar Speaker
Tip: Disconnect the electrical connectors.
Band
Changes between AM/FM1/FM2/WX
Config
Press to change system settings
Eject
Press to eject the map DVD
Map
Press to enter map mode
Repeat
Press to repeat the last voice guidance
Source
Changes between the different
Tilt
Press to tilt the position of the display screen
Tune/Seek
Allows the system to tune to the next preprogrammed
station or to seek stations in the area
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Provides verbal guidance to the operator
Global Positioning System (GPS) Antenna
The global positioning system (GPS) antenna is located in the upper center of the I/P. The GPS
antenna is powered through the same coaxial cable used to send the signals to the NAV.
Voice Recognition
The Navigation System voice recognition allows for hands-free operation of navigation and audio
system features. The voice recognition can be used when the ignition is in accessory or ON, or
when retained accessory power (RAP) is active. This feature only works if the map DVD is
inserted and the AGREE button has been pressed. The memory seats can also be able to be set
and selected using the voice recognition feature. For a complete list of available commands, refer
to the Owners Manual Navigation Supplement and/or Personalization in the Owners manual.
ONSTAR DESCRIPTION AND OPERATION
This vehicle uses the Generation 7.0 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.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Vehicle Communication Interface Module (VCIM)
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 the 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 or GMLAN serial data bus, depending upon the serial data architecture of
the vehicle. The ignition state is determined by the VCIM through serial data messaging. The
module also has the capability of commanding the horn, initiating door lock/unlock and operating
the exterior lamps using the serial data circuits. When an OnStar® keypress is made, a serial data
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
carriers 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 phone icon 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 displays a white cross with a red background, 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
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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