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Interior Lighting Systems 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 Ignition ON, cover the ambient light sensor. Vary the interior lamp dimming switch from dim to Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the headlamp switch. 2. Ignition OFF, verify that a test lamp illuminates between the ground circuit terminal 8 and B+. If the test lamp does not illuminate, test the ground circuit for an open/high resistance. 3. Ignition ON, verify the scan tool Dimming Control Signal parameter is less than 0.1 volts. If greater than the specified range, test the signal circuit terminal 13 for a short to 4. Ignition ON, test for 12 volts between the I/P dimming voltage reference circuit terminal 15 and ground. If less than the specified value, test the voltage reference circuit for a short to ground 5. Install a 3A fused jumper wire between the signal circuit terminal 13 and the voltage reference circuit terminal 15. Verify the scan tool BCM Dimming Control Signal parameter If less than the specified range, test the signal circuit for a short to ground or an 6. If all circuits test normal, test or replace the headlamp switch. Repair Procedures
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Headlamp Switch Replacement (without RPO SLT) or Headlamp Switch Control Module References for BCM replacement, setup, and programming DTC B2530 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 B2530 00 Front Fog Lamp Control Circuit Diagnostic Fault Information Circuit/System Description Voltage is applied at all times to the fog lamp relay. When the fog lamp switch is placed in the Conditions for Running the DTC The ignition is ON. Park lamps must be ON and the fog lamps must be commanded ON. Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Front Fog Lamp Relay 1 2 B2530 00 - 1. Fog Lamps Always On 2. Fog Lamps Inoperative
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Conditions for Setting the DTC The BCM detects a short to voltage on the front fog lamp control circuit. Action Taken When the DTC Sets The front fog lamps do not illuminate. Conditions for Clearing the DTC The conditions for setting the DTC are no longer present. A history DTC clears after 100 malfunction-free ignition cycles. Reference Information Schematic Reference Fog Lights Schematics Connector End View Reference Component Connector End Views Description and Operation Exterior Lighting Systems 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 Ignition ON, activate the Fog Lamps output control on the scan tool. The Front Fog Lamp Relay
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Testing 1. Ignition OFF, remove the fog lamp relay in the underhood fuse block. 2. Ignition ON, test for voltage at the relay control circuit terminal 86 of the underhood fuse block. If voltage is present, test the control circuit for a short to voltage. If all If voltage is not present, replace the BCM. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Control Module References for BCM replacement, setup, and programming DTC B2545 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 B2545 00 Backup Lamps Circuit Diagnostic Fault Information Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Backup Lamps Voltage B2545 00 1 2 - 1. Backup Lamps Inoperative 2. Backup Lamps Always On
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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