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bright to dim when changing between the commanded states. If the test lamp is always off, test the control circuit for an open/high resistance or If the test lamp is always bright, test the control circuit for a short to voltage. If the 5. If all circuits test normal, test or replace the affected component. LED Dimming Circuit Test 1. Ignition OFF, disconnect the harness connector at the affected component. 2. Ignition OFF, verify that a test lamp illuminates between the listed ground circuit terminal and battery voltage. Right steering wheel switch terminal 1 Left steering wheel switch terminal 8 DIC switch terminal 5 Manual HVAC control module terminal 10 X2 Multifunction accessory switch terminal 3 If the test lamp does not illuminate, test the ground circuit for an open/high resistance. 3. Connect a test lamp between the listed LED dimming control circuit terminal and ground. Right steering wheel switch terminal 2 Left steering wheel switch terminal 6 Power take off switch terminal 6 Trailer brake controller switch terminal 7 IPC terminal 8 Radio terminal 7 X1 DIC switch terminal 4 Manual HVAC control module terminal 1 X2 Multifunction accessory switch terminal 4 4. Command the dimming test high to low with a scan tool. The test lamp should turn from bright to dim when changing between the commanded states. If the test lamp is always off, test the control circuit for an open/high resistance or If the test lamp is always bright, test the control circuit for a short to voltage. If the 5. If all circuits test normal, test or replace the affected component.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Front Door Switch Backlighting Circuit Test 1. Ignition OFF, disconnect the harness connector X4 at the door lock and side window switch. 2. Connect a 3A fused jumper wire between the low reference circuit terminal 4 and ground. 3. Connect a test lamp between the backlight supply voltage circuit terminal 13 and B+. The heated seat switch backlighting should illuminate. If the switch backlighting does not illuminate, replace the heated seat switch. 4. If the switch backlighting tests normal, replace the door lock and side window switch. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Front Seat Heater Switch Replacement (w/o KB6) Steering Wheel Control Switch Assembly Replacement Driver Information Display Switch Replacement (without RPO SLT) or Driver Accessory Switch Replacement (with RPO SLT) or Accessory Switch Replacement Headlamp Switch Replacement (without RPO SLT) or Headlamp Switch Control Module References for BCM, door lock and side window switch, IPC, radio, INTERIOR BACKLIGHTING MALFUNCTION (W/O AN3) 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 ignition switch is turned to the RUN position, the radio VF display turns ON at
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
potentiometer is an input to the body control module (BCM). When the driver selects a dimming Reference Information Schematic Reference Interior Lights Dimming Schematics Connector End View Reference Component Connector End Views Description and Operation 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, observe the scan tool BCM Dimming Control Signal parameter while operating the If the reading does not change, refer to Dimmer Switch Circuit Test below. If the scan tool dimmer control operates normal, refer to the Interior Backlighting Circuit
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Testing Dimmer Switch Circuit Test 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 B+ 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. Interior Backlighting Circuit Test 1. Ignition OFF, disconnect the harness connector at the affected component. 2. Ignition OFF, verify that a test lamp illuminates between the listed ground circuit terminal and battery voltage. Passenger window switch terminal F Headlamp switch terminal 8 Transfer case control switch terminal 6 Sunroof switch terminal 5 Door lock switch terminal B Roof beacon switch terminal 1 Sliding rear window switch terminal D Garage door opener switch terminal 3 Outside rear view mirror switch terminal G
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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