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1. Ignition OFF, disconnect the antenna coax from the DRR. 2. Connect the EL-48028 to the DRR and place it on the roof of the vehicle. See Special Tools. 3. Ignition ON, radio tuned to XM, verify XM reception has improved. If the XM reception has not improved, replace the DRR. 4. Ignition OFF, disconnect the antenna coaxial cable from the DRR antenna base. 5. Test for less than 5 ohms between the two ends of the coax cable center conductor. If greater than the specified range, replace the antenna coax cable. 6. Test for less than 5 ohms between the two ends of the coax cable outer shield. If greater than the specified range, replace the antenna coax able. 7. Test for infinite resistance between the antenna coax center conductor and the outer shield. If less than the specified range, replace the antenna coax cable. 8. If all circuits test normal, replace the digital radio antenna. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Mobile Telephone Digital Antenna Replacement Control Module References for DRR replacement, setup, and programming DTC B1287 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 Descriptors DTC B1287 01 Amplifier Control Signal Circuit Short to Battery DTC B1287 02 Amplifier Control Signal Circuit Short to Ground
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DTC B1287 04 Amplifier Control Signal Circuit Open Diagnostic Fault Information Circuit/System Description The amplifier receives PWM signals on the antenna 14V switch supply voltage circuit at varying Conditions for Running the DTC Radio is ON The system voltage is at between 9 volts and 16 volts Conditions for Setting the DTC A short to voltage, short to ground, or an open is seen on the remote enable circuit Action Taken When the DTC Sets Amplifier functions are disabled Conditions for Clearing the DTC A current DTC clears when the condition for setting the DTC is no longer present A history DTC clears after 100 malfunction- free ignition cycles Reference Information Schematic Reference Radio/Navigation System Schematics Connector End View Reference Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Antenna 14V Switched Supply B1287 02 B1287 04 B1287 01 -
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Component Connector End Views Description and Operation Radio/Audio 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 Radio ON, adjust the fade and balance control to verify audio is present at each individual Circuit/System Testing 1. Ignition OFF, disconnect the X1 harness connector at the amplifier. 2. Radio ON, test for B+ between the signal circuit terminal 8 and ground. If less than the specified value, test the signal circuit for a short to ground or an 3. If all circuits test normal, replace the amplifier. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for radio or amplifier replacement DTC B1288 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 B1288 01 Video Display Mode Control Signal Short to Battery DTC B1288 02 Video Display Mode Control Signal Short to Ground DTC B1288 04 Video Display Mode Control Signal Open Circuit Diagnostic Fault Information Circuit/System Description The radio can control the video display mode on vehicles equipped with rear seat entertainment Conditions for Running the DTC Ignition ON. Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance DVD Display B+ 1 1 1 - Radio ON Signal 1 1 1 - Video Display Brightness B1289 02 B1289 04 B1289 01 - Video Display Mode Control B1288 02 B1288 04 B1288 01 - Video High Signal 1 1 1 - Video Low Signal 1 1 1 - DVD Display Ground - 1 - - 1. Video Entertainment System Inoperative.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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