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Chevrolet Silverado / GMC Sierra. Manual - part 2234
If the prompt OnStar Request Ended is heard without pressing the white dot button at the
end of an OnStar® keypress, the OnStar® system at one time made a successful cellular
connection, but was unable to complete the call. If repeated calls are placed with this result,
contact the General Motors Technical Assistance Center.
An inaccurate or aged GPS position may have been due to the temporary loss of GPS signal
reception by the vehicle in instances, such as driving through tunnels or parking structures
which restrict the navigation antenna from a clear view of the satellites in the sky.
Reference Information
Schematic Reference
OnStar Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
OnStar Description and Operation
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Circuit/System Verification
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
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
1. Ignition ON, observe that the OnStar® status LED turns green.
If the LED does not turn green, refer to OnStar Button LED Inoperative.
2. Radio ON, set the volume to a comfortable level.
3. Press the OnStar® Call Center button and observe that the OnStar LED blinks.
If the OnStar® LED does not blink, refer to OnStar One or More Buttons
Inoperative.
4. Listen that the radio muted and the Connecting to OnStar message played through the audio
system.
If the radio did not mute or the Connecting to OnStar message did not play, refer to
No (or Noisy) OnStar Audio.
5. Wait approximately 10 seconds, then end the call by pressing the white dot button and
observe the OnStar LED stops blinking.
If the OnStar® LED continues blinking, refer to OnStar One or More Buttons
Inoperative.
6. Press the OnStar® Call Center button and ensure that a connection was made with
OnStar®.
If the Unable to Contact OnStar® was heard, refer to Unable to Contact OnStar
Call Center.
If the OnStar® Request Ended was heard, go to Diagnostic Aids.
7. Ensure that 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.
8. Ensure that OnStar® Call Center advisor received a data transfer from the vehicle.
9. Ensure with the OnStar® Call Center advisor the vehicle has been configured.
If the vehicle has not been configured, refer to Control Module References
10. Verify with the OnStar® Call Center advisor that the vehicle identification number (VIN)
which they have on record matches the actual VIN.
11. Verify that your position with the OnStar® Call Center advisor is within a reasonable
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.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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.
12. 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.
13. Ensure that 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.
14. Refer to OnStar Call Center Remote Function Requests Inoperative.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for VCIM replacement, setup, and programming
RADIO AUDIO INOPERATIVE AT REAR SEAT AUDIO (RSA) CONTROL
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provide an overview of each diagnostic category.
Reference Information
Schematic Reference
Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Circuit Testing
Connector Repairs
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
1. Center the balance and fade adjustment on the radio.
If adjustment of the fade and balance eliminates the concern, review the operation of
the radio with the customer.
2. Verify that the wireless headphones are set to the proper channel and are working properly.
If the wireless headphones are not operating properly, go to Video Entertainment
System Wireless Headphone Inoperative.
3. Disconnect the X2 connector of the rear HVAC control module. Connect a DMM between
the suspect speaker output circuits (input to the RSA) from the radio. Turn ON the radio
and verify there is AC voltage present.
If AC voltage is not present, go to Speaker Malfunction.
4. Test or repair open, short to ground or short to voltage on the RSA ground circuit and
battery positive voltage circuit.
If all circuits test normal, replace the rear HVAC control module.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Rear Seat Audio Control Replacement
RADIO CONTROLS INOPERATIVE - REAR SEAT
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provide an overview of each diagnostic category.
Reference Information
Schematic Reference
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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