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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 Ignition ON, low beam headlamps ON, turn the headlamp dimmer switch to the high beam Circuit/System Testing Ignition ON, with a scan tool perform the Display Test for the instrument panel cluster (IPC) and If the high beam indicator does not illuminate during the test or remains illuminated at all If the high beam indicator illuminates during the test, replace the BCM. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for BCM or IPC replacement, programming, and setup. INTERIOR BACKLIGHTING MALFUNCTION (W/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.
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 When the ignition switch is turned to the RUN position, the radio VF display turns ON at 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
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. Ignition ON, observe the driver door switch while commanding the Driver Door Switch Integrated Sw. Backlighting Test ON and OFF with a scan tool. The switch backlighting If the backlighting does not turn On and OFF or remains always ON, replace the 2. Ignition ON, observe the driver memory/heated seat switch while commanding the Driver Door Switch Non-Integrated Sw. Backlighting Test ON and OFF with a scan tool. The If the backlighting does not turn On and OFF or remains always ON, refer to Front 3. Ignition ON, observe the passenger door switch while commanding the Passenger Door Switch Integrated Sw. Backlighting Test ON and OFF with a scan tool. The switch If the backlighting does not turn On and OFF or always remains ON, replace the 4. Ignition ON, observe the passenger heated seat switch while commanding the Passenger Door Switch Non-Integrated Sw. Backlighting Test ON and OFF with a scan tool. The If the backlighting does not turn On and OFF or remains always ON, refer to Front 5. Ignition ON, observe the scan tool BCM Dimming Control Signal parameter while operating the dimmer switch from high to low. The reading should change from a high 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 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.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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. Rear window switch terminal F Headlamp switch terminal 8 Transfer case control switch terminal 6 Sunroof switch terminal 5 Roof beacon switch terminal 1 Sliding rear window switch terminal D Garage door opener 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 backlighting control circuit terminal and ground. Rear window switch terminal B Headlamp switch terminal 7 Transfer case control switch terminal 5 Sunroof switch terminal 3 Roof beacon switch terminal 2 Sliding rear window switch terminal E Garage door opener switch terminal 2 4. Command the dimming test high to low with a scan tool. The test lamp should turn from
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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