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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 B1517 03 Battery Voltage Below Threshold - BCM DTC B1517 07 Battery Voltage Above Threshold - BCM DTC B1517 5A Battery Voltage Plausibility Failure - BCM Diagnostic Fault Information Circuit/System Description The body control module (BCM) has circuits for monitoring vehicle system voltage. The BCM Conditions for Running the DTC The BCM has power and ground. Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance B+ B1517 03, B1517 5A B1517 03, B1517 5A - - Ground - B1517 03, B1517 5A - -
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The ignition is not in the START position. Conditions for Setting the DTC B1517 03 The battery voltage is less than 11 volts. The engine speed is greater than 1,100 RPM. The above conditions are met for 15 seconds. B1517 07 The battery voltage is greater than 16 volts. The engine speed is greater than 1,100 RPM. The above conditions are met for 15 seconds. B1517 5A The voltage of the two BCM battery sense circuits differs by 2 volts for 10 seconds. Action Taken When the DTC Sets The instrument panel cluster (IPC) illuminates the charge indicator. The driver information center (DIC) displays the SERVICE BATTERY CHARGING Conditions for Clearing the DTC The DTC will clear current status when fault is no longer present. The history DTC will clear after 50 consecutive ignition cycles have occurred without a Diagnostic Aids A high or low voltage DTC in multiple modules indicates a concern in the charging system. Inspect the ground connections G103 and G201, and insure that they are clean and tight. This DTC may be set by overcharging with a battery charger, or by jump starting. Reference Information
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Schematic Reference Body Control System Schematics Power Distribution Schematics Ground Distribution Schematics Connector End View Reference Component Connector End Views Description and Operation Charging 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. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to Charging System Test. 2. Observe the scan tool BCM Battery Voltage Signal parameter and the Batt. Voltage High Res. parameter. The reading for both parameters should be between 12.6 and 15.0 volts. Circuit/System Testing 1. Ignition OFF, disconnect the harness connectors at the BCM. 2. Ignition OFF, test for less than 5 ohms between the ground circuit terminals listed below and ground. Terminal 1 X3 Terminal 5 X3
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Terminal 9 X4 If greater than the specified range, test the ground circuit for an open/high resistance. 3. Verify that a test lamp illuminates between the B+circuit terminals listed below and ground. Terminal 3 X3 Terminal 10 X4 If the test lamp does not illuminate, test the B+ circuit for a short to ground or an 4. If all circuits tests normal, replace the BCM. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for BCM replacement, setup, and programming. DTC B1527 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 B1527 00 High Parasitic Load Circuit/System Description The body control module (BCM) monitors the state of charge (SOC) of the electrical system. If Conditions for Running the DTC The ignition is turned from Off to Accessory or Run. Conditions for Setting the DTC
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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