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Radio/Navigation System Schematics Connector End View Reference Component Connector End Views Description and Operation Navigation System 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 1. Ignition OFF, allow the navigation display to cool if the ambient temperature inside the vehicle is excessive and the radio is hot to the touch. Verify the navigation display is cool 2. Ignition ON, with a scan tool, clear all DTCs and operate the audio/navigation system within the Conditions for Running the DTC. Verify the DTC does not reset. If the DTC resets, replace the radio. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for Radio replacement, setup, and programming DTC B2476 OR B2482 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC B2476 00 Cellular Phone Select Service Switch DTC B2482 00 Cellular Phone Select Service Switch Range/Performance Diagnostic Fault Information Circuit/System Description The OnStar® button assembly consists of 3 buttons, Call/Answer, OnStar® Call Center, and Conditions for Running the DTC Ignition ON. Battery voltage must be between 9-16 volts. 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
Conditions for Setting the DTC B2476 The CIM detects a short to voltage, short to ground, or an open/high resistance on the keypad B2482 The CIM detects a valid signal on the keypad signal circuit for longer than 15 seconds. If one of Action Taken When the DTC Sets The OnStar® status LED turns red. No calls can be placed. The CIM will ignore all inputs from the OnStar® button assembly. Conditions for Clearing the DTC The condition responsible for setting the DTC no longer exists. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have 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
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. Ignition OFF, disconnect the harness connector at the inside rearview mirror. 2. Ignition ON, test for 9.8-10.2 volts between the keypad supply voltage circuit terminal 12 and ground. If less than the specified range, test the supply voltage circuit for a short to ground or If greater than the specified range, test the supply voltage circuit for a short to voltage. 3. Test for 0 volt between the keypad signal circuit terminal 11 and ground. If greater than the specified range, test the keypad signal circuit for a short to voltage. 4. Test for 9.8-10.2 volts between the keypad supply voltage circuit terminal 12 and the keypad signal circuit terminal 11. If less than the specified range, test the keypad signal circuit for an open/high 5. Test for less than 5 ohms between the mirror ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 6. Ignition OFF, disconnect the CIM X1 connector. Test for infinite resistance between the keypad signal circuit terminal 11 and ground. If less than the specified range, test the keypad signal circuit for a short to ground. 7. If all circuits test normal, test or replace the button assembly. Component Testing 1. Ignition OFF, disconnect the harness connector at the inside rearview mirror. 2. Test for infinite resistance between the keypad supply voltage terminal 12 and the keypad signal terminal 11. If less than the specified range, replace the inside rearview mirror. 3. Test for 1.4k-1.6k ohms between the keypad supply voltage terminal 12 and the keypad
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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