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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. DTC Descriptor DTC B2455 04 Cellular Phone Microphone Circuit Malfunction Open Circuit Diagnostic Fault Information Circuit/System Description The communication interface module (CIM) provides the cellular microphone with a supplied Conditions for Running the DTC The ignition must be in the RUN or ACC position. The system voltage is at least 9.5 volts and no more than 15.5 volts. All the above conditions are present for greater than 10 seconds. Conditions for Setting the DTC The CIM detects an open, short to ground or short to voltage in the cellular microphone The CIM detects an open/high resistance in the drain wire circuit for 10 seconds or greater. Actions Taken When the DTC Sets The OnStar® status LED turns red. Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Cellular Microphone Signal B2455 04 B2455 04 B2455 04 - Cellular Microphone Low - B2455 04 1 - 1. OnStar Microphone Inoperative - Caller Cannot Be Heard
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The CIM will not receive a signal from the microphone. Calls can be placed but the caller cannot be heard. Conditions for Clearing the DTC The condition responsible for setting the DTC no longer exists. A history DTC will clear once 50 consecutive malfunction-free ignition cycles have 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 harness connector at the cellular microphone. 2. Ignition OFF, disconnect the harness connector at the inside rearview mirror. 3. Ignition ON, test for 9.5-10.5 volts between the signal circuit terminal B and ground. If greater than the specified range, test the signal circuit for a short to voltage. If the
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If less than the specified range, test the signal circuit for a short to ground or an 4. Test for test for 9.5-10.5 volts between the signal circuit terminal B and the drain circuit terminal A. If less than the specified range, test the drain circuit for a short to voltage or an 5. If all circuits test normal, replace the cellular microphone. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Mobile Telephone Microphone Replacement Control Module References for CIM replacement, setup, and programming DTC B2462 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. DTC Descriptor DTC B2462 Global Positioning System (GPS) Signal Error Circuit Description The global positioning system (GPS) antenna is connected to the navigation radio by a coaxial Conditions for Running the DTC The radio must detect one of the following power modes: ACC ON RAP
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
RAP UNLK Conditions for Setting the DTC The navigation radio test the GPS antenna every 10 seconds. The radio determines there is an open in the GPS antenna. Actions Taken When the DTC Sets Unable to get GPS location updated, the radio uses the last reported position and the vehicle Route guidance may be inaccurate. This failure has no effect outside the navigation system. Conditions for Clearing the DTC A current DTC clears when the radio does not detect the failure for more than 10 seconds. A history DTC clears after 50 ignition cycles with no repeat of the failure. Reference Information Schematic Reference Radio/Navigation System Schematics Connector End View Reference Component Connector End Views 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
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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