Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 111 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESONSTAR SYMPTOM DIAGNOSISCIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Verification
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
- To successfully diagnose and repair the OnStar® system it is necessary to comprehend its operation. Technicians should read and understand the OnStar Description and Operation before attempting to repair an OnStar® system. This symptom below will enable the user to verify the customer complaint and narrow it to its source. If there is a concern with voice recognition or OnStar® steering wheel control function, technicians should proceed directly to the applicable diagnostic in Symptoms - Cellular Communication .
- It is important to have the vehicle in an open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.
- It is necessary to inform the OnStar® Call Center advisor that this call is for vehicle diagnostic purposes.
- Ignition ON, verify the OnStar® status LED turns green.
- If the LED does not turn green, refer to OnStar Button LED Inoperative .
- Radio ON, set the volume to a comfortable level.
- Press the OnStar® Call Center button and verify the OnStar LED blinks.
- If the OnStar® LED does not blink, refer to OnStar One or More Buttons Inoperative .
- Verify the radio mutes and the Connecting to OnStar message is heard through the audio system.
- If the radio does not mute or the Connecting to OnStar message does not play, refer to No (or Noisy) OnStar Audio .
- Wait 10 seconds, then end the call by pressing the white dot button and verify the OnStar LED stops blinking.
- If the OnStar® LED continues to blink, refer to OnStar One or More Buttons Inoperative .
- Press the OnStar® Call Center button and verify a connection has been made with OnStar®.
- If the Unable to Contact OnStar® is heard, refer to Unable to Contact OnStar Call Center .
- If the OnStar® Request Ended is heard, go to Diagnostic Aids.
- Verify the OnStar® Call Center advisor can hear your voice clearly.
- If the advisor cannot hear you clearly, refer to OnStar Microphone Inoperative - Caller Cannot Be Heard .
- Verify the OnStar® Call Center advisor received a data transfer from the vehicle.
- If the data did not transfer, use the scan tool to access the STID and ESN and contact the General Motors Technical Assistance Center.
- Verify with the OnStar® Call Center advisor the vehicle has been configured.
- If the vehicle has not been configured, ask the OnStar® Call Center advisor to perform a reconfiguration on the vehicle. If not successful, ask the advisor why the reconfiguration was not successful, use the scan tool to access the STID and ESN and contact the General Motors Technical Assistance Center.
- Verify with the OnStar® Call Center advisor that the vehicle identification number (VIN) which they have on record matches the actual VIN.
- Ask the OnStar® Call Center advisor to update the customer account with the correct information, and to perform a reconfiguration of the vehicle. If the reconfiguration was not successful, ask the advisor why the reconfiguration was not successful, use the scan tool to access the STID and ESN and contact the General Motors Technical Assistance Center.
- Verify your position with the OnStar® Call Center advisor is within a reasonable distance from the actual location of the vehicle.
- If not within a reasonable distance, refer to OnStar Global Positioning System (GPS) Data Not Current or Inaccurate .
- Verify with the OnStar® Call Center advisor that the GPS position is marked as Current.
- If not current, refer to OnStar Global Positioning System (GPS) Data Not Current or Inaccurate .
- Verify the customer concern is the inability of the OnStar® Call Center to perform remote functions.
- If the OnStar® Call Center is able to perform remote functions, go to Diagnostic Aids.
- Refer to OnStar Call Center Remote Function Requests Inoperative .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.