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1. Ignition OFF, disconnect the GPS coaxial cable from the GPS antenna. 2. Ignition ON, test for 4.0-5.5 volts between the center conductor and the shield of the coaxial cable. If not within the specified range, replace the GPS antenna. 3. Ignition OFF, test for less than 5 ohms or resistance at the GPS coaxial cable center conductor from end to end. If greater than the specified range, replace the GPS coaxial cable. 4. Ignition OFF, test for infinite resistance between the center conductor and the outer conductor of the GPS coaxial cable. If less than the specified range, replace the GPS coaxial cable. 5. If all circuits test normal, replace the radio. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Global Positioning System (GPS) Antenna Replacement Control Module References for radio replacement, setup, and programming DTC B2470 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 B2470 00 Cellular Phone Antenna Circuit Malfunction Circuit/System Description The cellular antenna is connected to the vehicle communication interface module (VCIM) with a Conditions for Running the DTC
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 1 second. Conditions for Setting the DTC The VCIM does not detect the presence of a cellular antenna. The above conditions are present for greater than 1 second. Action Taken When the DTC Sets The vehicle is unable to connect to the OnStar® Call Center. The OnStar® status LED turns red. Conditions for Clearing the DTC The VCIM detects the presence of a cellular antenna. A history DTC clears after 50 malfunction-free ignition cycles. The VCIM receives the clear DTC command from the scan tool. 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 for scan tool information Circuit/System Verification Verify that the cellular antenna and cellular antenna coupling assembly are not damaged. If the antenna assembly is damaged, replace the cellular antenna. Component Testing 1. Disconnect the cellular antenna coax connector from the VCIM and the cellular antenna. 2. Test for infinite resistance between the center conductor and the outer metal shield of the cellular antenna coax cable. If meter does not read infinite, replace the cellular antenna coax cable. 3. Test for less than 1 ohm of resistance at the cellular antenna coax connector from end to end. If greater than specified value, replace the cellular antenna coax cable. 4. Ignition OFF, connect a fused jumper wire between coaxial center conductor and the metal outer shield at the VCIM antenna coax cable connector. 5. Ignition ON, verify that DTC B2470 is not current. If DTC B2470 is still current, replace the VCIM. 6. If all circuits test normal, replace the cellular antenna. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Mobile Telephone Digital Antenna Replacement Control Module References for VCIM replacement, setup, and programming DTC B2474 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. IMPORTANT: The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length
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 Descriptor DTC B2474 07 Navigation Display Head Backlighting Performance Circuit Description The internal backlighting of the navigation display screen located in the navigation radio. Conditions for Running the DTC Radio ON. Battery voltage must be between 9-16 volts. Conditions for Setting the DTC The navigation radio tests the navigation display backlighting every 1 second. The radio determines there is a malfunction or overheat condition in the navigation display Action Taken When the DTC Sets Navigation backlighting may be too bright, dim or blank. 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 Diagnostic Aids Occasionally it is possible to overheat the navigation display backlighting due to excessive Reference Information Schematic Reference
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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