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ground. If the test lamp does not illuminate, replace the underhood fuse block. 4. Connect a test lamp between the relay control circuit terminal 85 and the B+ circuit terminal 86. 5. Command the parking lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the relay control circuit for a short to ground. If the If the test lamp is always OFF, test the relay control circuit for a short to voltage or an 6. If all circuits test normal, test or replace the park lamp relay. Exterior Lamps Circuit Test 1. Ignition OFF, disconnect the harness connector at an affected park, marker, license, or tail lamp. 2. Verify that a test lamp illuminates when connected between battery voltage and the listed ground circuit terminal. Front park lamp terminal G Tail lamp terminal GRD Marker and clearance lamps terminal A License lamp terminal B If the test lamp does not illuminate, test the ground circuit for an open/high resistance. 3. Ignition ON, connect a test lamp between the listed control circuit terminal and ground. Front park lamp terminal MAJ Tail lamp terminal MNR Marker and clearance lamps terminal B License lamp terminal A 4. Command the parking lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the If the test lamp is always OFF, test the control circuit for a short to voltage or an 5. If all circuits test normal, test or replace the affected lamp.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Park/Turn Signal Lamp Bulb Replacement (Chevrolet) or Park/Turn Signal Lamp Rear License Lamp Replacement (VF7) or Rear License Lamp Replacement Tail Lamp Bulb Replacement (GMC) or Tail Lamp Bulb Replacement (Chevrolet) Headlamp Switch Replacement (without RPO SLT) or Headlamp Switch Control Module References for BCM replacement, programming, and setup. READING LAMPS MALFUNCTION 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. Circuit/System Description The inadvertent power supply voltage circuit of the body control module (BCM) provides battery Reference Information Schematic Reference Interior Lights Schematics Connector End View Reference Component Connector End Views Description and Operation Interior Lighting Systems Description and Operation
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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, turn the reading lamps on and off. The reading lamps should turn on and off. Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at an affected courtesy/reading lamp center. 2. Test for less than 1 ohm of resistance between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Ignition ON, verify that a test lamp illuminates between the listed inadvertent power supply circuit terminal and ground. Front terminal A Rear terminal C If the test lamp does not illuminate, test the inadvertent power supply circuit for a 4. Connect the harness connector at the courtesy/reading lamp center, and remove the reading lamp bulb. 5. Connect a test lamp across the bulb terminals. 6. Ignition ON, turn the reading lamp switch on and off. The test lamp should turn on and off when changing between the commanded states. If the test lamp is always on, replace the affected courtesy/reading lamp center. If the test lamp is always off, replace the affected courtesy/reading lamp center. 7. If all circuits test normal, test or replace the affected reading lamp bulb. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Dome Lamp Replacement Control Module References for BCM replacement, programming, and setup. STOP LAMPS MALFUNCTION 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. Circuit/System Description When the driver presses the brake pedal, the switch contacts open and battery positive voltage is Reference Information Schematic Reference Exterior 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
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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