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Circuit/System Description When an OnStar® keypress is made, a serial data message is sent to the audio system to mute all 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 Scan Tool Reference Control Module References for scan tool information Circuit/System Testing 1. Ignition OFF, disconnect the X2 harness connector at the CIM. Low Reference
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2. Ignition ON, test for less than 5 mV AC between the signal circuit terminal 1 and ground. If greater than the specified range, test the signal circuit for a short to voltage. If the 3. Install a DMM between the signal circuit terminal 1 and ground. Set the DMM to capture AC voltage using the MIN MAX function. 4. Press the voice recognition button. Verify the DMM captured greater than 20 mV AC. If less than the specified range, test the signal circuit for a short to ground or an 5. Install a DMM between the signal circuit terminal 1 and the low reference circuit terminal 2. Set the DMM to capture AC voltage using the MIN MAX function. 6. Press the voice recognition button. Verify the DMM captured greater than 20 mV AC. If less than the specified range, test the low reference circuit for an open/high 7. If all circuits test normal, replace the CIM. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for Radio or CIM replacement, setup, and programming NO GLOBAL POSITIONING SYSTEM (GPS) RECEPTION 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 provides an overview of each diagnostic category. Reference Information Schematic Reference Radio/Navigation System Schematics Connector End View Reference Component Connector End Views
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References Circuit/System Testing 1. Remove the GPS antenna and cable and place it outside the vehicle. Verify the GPS reception is operational within 5 minutes. If GPS becomes operational, remove any suspect window tint or objects that may 2. Replace the GPS antenna. Verify the GPS reception is operational within 5 minutes. If GPS is not operational, replace the radio. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for radio replacement, setup, and programming Global Positioning System (GPS) Antenna Replacement ONSTAR BUTTON LED INOPERATIVE 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 provides an overview of each diagnostic category. Diagnostic Fault Information IMPORTANT: The global positioning system (GPS) requires a clear line of sight to the sky to operate properly. In most cases the GPS will not
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit Description The OnStar® status LEDs are located with the OnStar buttons. The green LED is illuminated 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 Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Keypad Supply Voltage B2476 00 B2476 00 B2476 00 - Keypad Green LED Signal 1 1 2 - Keypad Red LED Signal 1 1 2 - Keypad Signal 3 3 - - Inside Rearview Mirror - 1 - - 1. OnStar® LED Inoperative
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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