For 1990-2009 cars

# Unable to Connect in Laurel, Pulaski and Rockcastle Counties, KY - keywords analog blue button cell cellular communication digital failedtovoice intermittent OnStar opc operation vs3bgen6

Subject: | Unable to Connect in Laurel, Pulaski and Rockcastle Counties, KY

Models: | 2004-2005 Buick Century, Rainier, Regal, Rendezvous

| 2005 Buick LaCrosse, LeSabre, Terraza

| 2004-2005 Cadillac Escalade, Escalade ESV, Escalade EXT

| 2005 Cadillac CTS, DeVille, Seville, SRX, STS

| 2004-2005 Chevrolet Avalanche, Silverado, Suburban, Tahoe

| 2004-2005 Chevrolet Colorado, Impala, Monte Carlo

| 2005 Chevrolet Express, Malibu/Malibu Maxx, TrailBlazer, Uplander

| 2004-2005 GMC Canyon, Envoy, Envoy XUV, Sierra

| 2005 GMC Savana, Yukon, Yukon Denali, Yukon XL

| 2004-2005 HUMMER H2

| 2004 Oldsmobile Aurora

| 2004 Oldsmobile Bravada

| 2004-2005 Pontiac Aztec, Grand Prix

| 2005 Pontiac Bonneville, G6, Montana SV6, Vibe

| 2004-2005 Saturn L-Series

| 2005 Saturn Ion, Relay, VUE

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.

### Condition/Concern:

Some Gen 6 customers may report on an OnStar (Blue button) or Emergency (red button) key press it results in: progression tones (1 every 6 seconds), dropped or a voice only call. A possible cause could be the OnStar VCIM is latched onto the wrong cellular network provider.

### Recommendation/Instructions:

Ensure the Tech 2 is updated with software version 25.003 or later. Enter the OnStar Vehicle Communication Interface Module > Program digital Home SID/NID > Set the SID value to 00001, save and exit the menu. DO NOT change the NID setting unless directed by OnStar or General Motors Technical Assistance.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.