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Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Verification 1. Ignition ON, command the Green LED ON and OFF with a scan tool while observing the green LED on the inside rearview mirror. The green LED should turn ON and OFF when 2. Command the red LED ON and OFF with a scan tool while observing the red LED on the inside rearview mirror. The red LED should turn ON and OFF when commanded. Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the inside rearview mirror. 2. Doors closed, courtesy lamps OFF, test for less than 5 ohms between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Ignition ON, command the green LED OFF with a scan tool. Test for less than 1 volt between the control circuit terminal 14 and ground. If greater than the specified range, test the control circuit for a short to voltage. If the 4. Command the green LED ON with a scan tool. Test for greater than 9 volts between the control circuit terminal 14 and ground. If less than the specified range, test the control circuit for a short to ground or an 5. Command the red LED OFF with a scan tool. Test for less than 1 volt between the control circuit terminal 15 and ground. If greater than the specified range, test the control circuit for a short to voltage. If the 6. Command the red LED ON with a scan tool. Test for greater than 9 volts between the control circuit terminal 15 and ground. If less than the specified range, test the control circuit for a short to ground or an 7. If all circuits test normal, replace the inside rearview mirror.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Inside Rearview Mirror Replacement Control Module References for CIM replacement, setup, and programming ONSTAR CALL CENTER REMOTE FUNCTION REQUESTS 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. Circuit/System Description The vehicle communication interface module (VCIM) has the capability of commanding the horn, 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
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Scan Tool Reference Control Module References Diagnostic Aids The customer concern may have been due to a lack of cellular service in a given area. A failure in Circuit/System Verification 1. Observe that the horn, lights, and the doors locks on the vehicle operate properly. If the applicable system does not operate properly, refer to Diagnostic Starting Point 2. Contact the OnStar® Call Center by pressing the blue OnStar® button. Verify with the OnStar® advisor that all of the remote functions (door locks, lights, or horn) work. If the remote functions do not work, use the scan tool to access the STID and ESN and ONSTAR ONE OR MORE BUTTONS 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: It is necessary to inform the OnStar® Call Center advisor that this call is for vehicle diagnostic purposes. 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
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Description The OnStar® button assembly consists of 3 buttons, Call/Answer, OnStar® Call Center, and 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 Verification Ground - 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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