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each rear doors one at a time. The reading should change between Door Open and Door If the Ctsy. Lamp Actv. Reason parameter does not change between Door Open and 5. Ignition ON and all doors closed, observe the scan tool BCM Ctsy. Lamp Actv. Reason parameter while turning the dome lamp switch ON and OFF. The reading should change If the Ctsy. Lamp Actv. Reason parameter does not change between Off and Manual, 6. Ignition ON and all doors closed, observe the scan tool BCM Ctsy. Lamp Actv. Reason parameter while turning the interior lamp defeat switch ON and OFF. The reading should If the Ctsy. Lamp Actv. Reason parameter does not change between Off and Manual, Circuit/System Testing Courtesy Lamp Control Circuit Test 1. Ignition OFF, disconnect the harness connector at an affected lamp bulb. 2. Test for less than 1 ohm of resistance between the ground circuit terminal and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Connect a test lamp between the control circuit terminal and the ground circuit terminal. 4. Ignition ON, command the Courtesy Lamps output control on and off with the scan tool. The test lamp should turn on and off. If the test lamp is always ON, test the control circuit for a short to voltage. If the If the test lamp is always OFF, test the control circuit for a short to ground or an 5. If all circuits test normal, test or replace the bulb. Door Open Switch Test-Front 1. Ignition OFF, disconnect the harness connector at the affected door latch. 2. Test for less than 1 ohm of resistance between the listed ground circuit terminal and ground. Driver terminal 8 Passenger terminal 3
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If greater than the specified range, test the ground circuit for an open/high resistance. 3. Ignition ON, verify the scan tool door open switch parameter is inactive. If not the specified value, test the listed signal circuit terminal for a short to ground. If Driver terminal 7 Passenger terminal 2 4. Install a 3A fused jumper wire between the listed signal circuit terminal and low reference circuit terminal. Verify the scan tool door open switch parameter is active. Driver terminal 7 to terminal 8 Passenger terminal 2 to terminal 3 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 affected door latch. Door Open Switch Test-Rear 1. Ignition OFF, disconnect the harness connector at the affected door latch. 2. Test for less than 1 ohm of resistance between the listed ground circuit terminal and ground. Left terminal 6 Right terminal 3 If greater than the specified range, test the ground circuit for an open/high resistance. 3. Ignition ON, verify the scan tool passenger door open switch parameter is Closed. If not the specified value, test the listed signal circuit terminal for a short to ground. If Left terminal 5 Right terminal 2 4. Install a 3A fused jumper wire between the listed signal circuit terminal and low reference circuit terminal. Verify the scan tool passenger door open switch parameter is Open. Left terminal 5 to terminal 6 Right terminal 2 to terminal 3 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 affected door latch. Dome/Interior Lamp Switch Test
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Ctsy. Lamp Actv. Reason parameter is Off. If not the parameter is Manual or Manual Defeat, test the affected signal circuit Manual terminal 12 Manual Defeat terminal 9 4. Install a 3A fused jumper wire between the signal circuit terminal 12 and the ground circuit terminal 8. Verify the scan tool Ctsy. Lamp Actv. Reason parameter is Manual. If not the specified value, test the signal circuit for a short to voltage or an open/high 5. Install a 3A fused jumper wire between the signal circuit terminal 9 and the ground circuit terminal 8. Verify the scan tool Ctsy. Lamp Actv. Reason parameter is Manual Defeat. If not the specified value, test the signal circuit for a short to voltage or an open/high 6. If all circuits test normal, test or replace the headlamp switch. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Dome Lamp Replacement Front Side Door Lock Replacement Rear Door Lock Replacement (Extended Cab Upper) or Rear Door Lock Headlamp Switch Replacement (without RPO SLT) or Headlamp Switch Control Module References for BCM, driver door switch, or passenger door switch COURTESY LAMPS 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.
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. Diagnostic Fault Information Circuit/System Description Voltage for the courtesy lamps is supplied from body control module (BCM). When a door is Reference Information Schematic Reference Interior Lights 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 Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Dome Lamp Switch Signal 1 3 - - Interior Lamp Defeat Switch 2 4 - - Door Open Switch Signal 1
- - Courtesy Lamp Control B2615 2 1 - 1. Courtesy lamps always on
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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