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Driver window switch terminal A X2 If the test lamp does not illuminate, test the ground circuit for an open/high resistance. 3. Connect a test lamp between the listed backlighting control circuit terminal and ground. Passenger window switch terminal B Headlamp switch terminal 7 Transfer case control switch terminal 5 Sunroof switch terminal 3 Door lock switch terminal A Roof beacon switch terminal 2 Sliding rear window switch terminal E Garage door opener switch terminal 2 Outside rear view mirror switch terminal E Driver window switch terminal 1 X1 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. 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
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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. 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, IPC, radio, and HVAC control module PARK, LICENSE, AND/OR TAIL 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.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Diagnostic Procedure Instructions provides an overview of each diagnostic category. Circuit/System Description The park, tail and marker lamps, including the license lamps, are turned ON when the headlamp 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 Control Module References for Scan Tool Information Circuit/System Verification
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. Ignition ON, observe the scan tool parklamp switch parameter while cycling the headlamp switch between the park and off positions. The parameter should cycle between active and If the parameter does not cycle between the specified values, refer to Park Lamp 2. Connect a test lamp between the relay side of a park lamp fuse and ground. 3. Command the parking lamps on and off with a scan tool. Verify that the test lamp turns on and off while switching between the commanded states. If the test lamp does not turn on and off while changing between the commanded 4. If any of the park, marker, license, or tail lamps do not turn on and off, refer to the Exterior Lamp Circuit Test below. Circuit/System Testing Park Lamp Switch Circuit Test 1. Ignition OFF, disconnect the harness connector at the headlamp switch. 2. Ignition OFF, test for less than 1.0 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 parklamp switch parameter is inactive. If not the specified value, test the signal circuit terminal 2 for a short to ground. If the 4. Install a 3A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool BCM parklamp switch parameter is active. If not the specified value, test the signal circuit for a short to voltage or open/high 5. If all circuits test normal, test or replace the headlamp switch. Park Lamp Relay Circuit Test 1. Ignition OFF, disconnect the park lamp relay. 2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, replace the underhood fuse block. 3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 86 and
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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