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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
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