For 1990-2009 cars

# Information on OnStar Dual-Mode (Analog/Digital) Systems

Subject: | Information on OnStar® Dual-Mode (Analog/Digital) Systems

Models: | 2000-2004 Buick LeSabre

| 2003-2004 Buick Rendezvous

| 2004 Buick Rainier, Regal

| 2004-2005 Buick Century

| 2005 Buick Allure (Canada), LaCrosse, LeSabre, Rainier, Rendezvous, Terraza

| 2002-2004 Cadillac DeVille, Seville

| 2003-2004 Cadillac CTS, Escalade Models

| 2004-2005 Cadillac SRX, XLR

| 2005 Cadillac CTS, DeVille, Escalade Models, STS

| 2001-2005 Chevrolet Impala, Monte Carlo

| 2002-2004 Chevrolet TrailBlazer Models

| 2003-2004 Chevrolet Avalanche, Express, Silverado, Suburban, Tahoe

| 2003-2005 Chevrolet Cavalier, Venture

| 2004 Chevrolet Colorado

| 2004-2005 Chevrolet Malibu, Malibu Maxx

| 2005 Chevrolet Avalanche, Cobalt, Colorado, Corvette, Equinox, Express, Silverado, Suburban, Tahoe, TrailBlazer Models, Uplander

| 2002-2004 GMC Envoy Models

| 2003-2004 GMC Savana, Sierra, Yukon Models

| 2004-2005 GMC Canyon

| 2005 GMC Denali, Denali XL, Envoy Models, Savana, Sierra, Yukon, Yukon XL

| 2001-2003 Oldsmobile Aurora

| 2002-2004 Oldsmobile Bravada

| 2003-2004 Oldsmobile Silhouette

| 2000-2004 Pontiac Bonneville

| 2003-2005 Pontiac Aztek, Montana, Sunfire

| 2004-2005 Pontiac Grand Prix

| 2005 Pontiac G6, Montana SV6, Pursuit (Canada), Vibe

| 2003-2005 HUMMER H2

| 2005 Saab 9-7X

| 2002-2005 Saturn VUE

| 2003-2005 Saturn ION

| 2003 Saturn L Series

| 2005 Saturn Relay

| PLUS 2006-2007 GM Passenger Cars and Trucks (including Saturn)

| 2006-2007 HUMMER H2, H3

| 2006-2007 Saab 9-7X

| with OnStar® (RPO UE1)

This bulletin is being revised to correct the model year range for the Chevrolet Impala and Monte Carlo and update the reference to GM Dealerworld. Please discard Corporate Bulletin Number 06-08-46-008B (Section 08-Body and Accessories).

All 2000-2003 model year vehicles equipped with OnStar® from the list above were built with Analog/Digital-Ready OnStar® Hardware. Some of these vehicles may have been upgraded to Dual-Mode (Analog/Digital).

Certain 2004-2005 model year vehicles equipped with OnStar® from the list above may have been either:

• | Originally built at the factory with Dual-Mode (Analog/Digital) OnStar® Hardware

| OR

• | Upgraded to Dual-Mode (Analog/Digital) Hardware

All 2006 model year and newer vehicles equipped with OnStar® were built at the factory with Dual-Mode (Analog/Digital) OnStar® Hardware.

If a vehicle has Dual-Mode (Analog/Digital) OnStar® Hardware, then the system is capable of operating on both the analog and digital cellular networks, and will not require an upgrade in connection with the cellular industry's transition to the digital network.

In order to verify the type of OnStar® Hardware in a vehicle, type the VIN into the VIN look-up tool, which is available at the OnStar® Online Enrollment website within GM GlobalConnect (for U.S. dealers) or InfoNet (for Canadian dealers).