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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, observe the scan tool hazard lamp switch parameter while operating the hazard Circuit/System Testing 1. Ignition OFF, disconnect the harness connector X1 at the turn signal/multifunction switch. 2. Test for less than 1 ohm of resistance between the ground circuit terminal C and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Ignition ON, verify the scan tool hazard lamp switch parameter is Inactive. If not the specified value, test the signal circuit terminal G for a short to ground. If the 4. Install a 3A fused jumper wire between the signal circuit terminal G and the ground circuit terminal C. Verify the scan tool hazard lamp switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high 5. If all circuits test normal, test or replace the turn signal/multifunction switch Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Turn Signal Multifunction Switch Replacement Control Module References for BCM replacement, programming, and setup. HEADLAMPS MALFUNCTION Diagnostic Instructions
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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. Diagnostic Fault Information Circuit/System Description The low beam headlamps are controlled by the BCM through the headlamp low/HID relay, and Reference Information Schematic Reference Headlights/Daytime Running Lights (DRL) Schematics Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Low Beam Hedalamp Control 1 1 3 - High Beam Hedalamp Control 2 2 4 - Low Beam Relay Control 3 1 B2575 - High Beam Relay Control 5 2 B2580 - Headlamp On Switch Signal B257A 6 - - High/Low Beam Select 5 2 - - Low Beam Headlamp Ground - 2 - - High Beam Headlamp Ground - 2 - - 1. Low beam headlamps inoperative
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 1. Ignition ON, observe the scan tool Headlamp Switch parameter while cycling the headlamp switch between the auto and headlamp position. The parameter should cycle between Active If the parameter does not cycle between the specified values, refer to the Headlamp 2. Observe the headlamps while cycling the headlamp switch between the auto and headlamp position. The low beam headlamps should turn on and off. If 1 or both of the low beam headlamps do not turn on and off, refer to the Low Beam 3. Low beam headlamps ON, observe the scan tool High Beam Select Switch parameter while switching the high/low beam select switch between the low and high beam positions. The If the parameter does not cycle between the specified values, refer to the High/Low 4. Connect a test lamp between the relay side of a high beam headlamp fuse and ground. 5. Verify that the test lamp turns on and off while switching the high/low beam select switch between the low and high beam positions.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If the test lamp does not turn on and off while changing between the commanded 6. If 1 or both of the high beam headlamps do not turn on and off, refer to the High Beam Headlamp Circuit Test below. Circuit/System Testing Headlamp Switch Circuit Test 1. Ignition OFF, disconnect the harness connector at the headlamp switch. 2. Test for less than 1 ohm of resistance between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Ignition ON, verify the scan tool Headlamp Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 1 for a short to ground. If the 4. Install a 3A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 8. Verify the scan tool Headlamp Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high 5. If all circuits test normal, test or replace the headlamp switch. High/Low Beam Select Switch Circuit Test 1. Ignition OFF, disconnect the harness connector X2 at the turn signal/multifunction switch. 2. Test for less than 1 ohm of resistance between the ground circuit terminal D and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Ignition ON, verify the scan tool High Beam Select Switch parameter is Inactive. If not the specified value, test the signal circuit terminal E for a short to ground. If the 4. Install a 3A fused jumper wire between the signal circuit terminal E and the ground circuit terminal D. Verify the scan tool High Beam Select Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high 5. If all circuits test normal, test or replace the signal/multifunction switch. Low Beam Headlamp Circuit Test
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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