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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
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