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Chevrolet Silverado / GMC Sierra. Manual - part 2478
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.
DTC Descriptors
DTC B2615 00
Passenger Compartment Dimming 2 Circuit
DTC B2615 01
Passenger Compartment Dimming 2 Circuit Short to Battery
DTC B2615 02
Passenger Compartment Dimming 2 Circuit Short to Ground
DTC B2615 04
Passenger Compartment Dimming 2 Circuit Open
Diagnostic Fault Information
Circuit/System Description
Voltage for the courtesy lamps is supplied from body control module (BCM), driver door switch,
and passenger door switch. When a door is opened, a signal is applied to the door module. The
door module then applies a message on the low speed GMLAN serial data communication circuit
to the BCM to activate the courtesy lamps. The BCM then applies voltage to the courtesy lamps
voltage supply circuit and the components on that circuit.
Conditions for Running the DTC
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
Courtesy Lamps Voltage
Supply
B2615 00 or
B2615 02
B2615 00 or
B2615 04
B2615 00 or
B2615 01
-
Courtesy Lamp Ground
-
1
-
-
1. Courtesy Lamps Inoperative
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The ignition is ON, the BCM, driver door switch, and passenger door switch attempt to
illuminate the courtesy lamps.
Conditions for Setting the DTC
The BCM, driver door lock and side window switch, or passenger door lock and side window
switch detects a short to ground, short to voltage, or open on the courtesy lamp voltage supply
circuit.
Action Taken When the DTC Sets
The BCM, driver door lock and side window switch, and passenger door lock and side window
switch cease attempts to illuminate the courtesy lamps.
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present.
A history DTC clears after 100 malfunction-free ignition cycles.
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
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, activate the Courtesy Lamps output control with the scan tool. The interior courtesy
lamps should illuminate.
Circuit/System Testing
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
circuit tests normal, replace the BCM.
If the test lamp is always OFF, test the control circuit for a short to ground or an
open/high resistance. If the circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the bulb.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Refer to the appropriate replacement procedure for the component causing the condition.
Control Module References for BCM, driver door lock and side window switch, or
passenger door lock and side window switch replacement, setup, and programming
DTC B2625
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.
DTC Descriptor
DTC B2625 00
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Display Dimming Pulse Width Modulation (PWM) Output Circuit
Diagnostic Fault Information
Circuit/System Description
When the interior lamps dimming switch is activated, a variable voltage signal is applied through
the instrument panel lamps dimmer switch signal circuit to the body control module (BCM). The
BCM then applies a variable voltage signal through the LED indicator dimming supply circuit to
the components on the circuit.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The BCM receives a ground signal on the LED indicator dimming supply circuit.
Action Taken When the DTC Sets
The BCM cease attempt to dim or illuminate the LED indicator lamps.
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present.
A history DTC clears after 100 malfunction-free ignition cycles.
Reference Information
Schematic Reference
Interior Lights Dimming Schematics
Connector End View Reference
Component Connector End Views
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
LED Indicator Dimming
Supply
B2625 00
B2625 00
B2625 00
-
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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