Chevrolet Silverado / GMC Sierra. Manual — part 2477
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Block the drive wheels. Carefully supply sufficient light to simulate daylight conditions to the
ambient light sensor. With the engine running, headlamp switch in AUTO, and the park brake
released, the DRL should illuminate.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector X4 at the BCM.
2. Ignition ON, verify the daytime running lamps are not on.
If the daytime running lamps are on, test the DRL relay control circuit for a short to
ground. If the circuit tests normal replace the underhood fuse block.
3. Install a 10A fused jumper wire between the relay control circuit terminal 23 and ground.
Verify the daytime running lamps are on. are on.
If the daytime running lamps are not on, test the DRL relay control circuit for a short
to voltage or an open/high resistance. If the circuit tests normal replace the underhood
fuse block.
4. If all circuits test normal, replace the BCM.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Underhood Electrical Center or Junction Block Replacement
Control Module References for BCM replacement, setup, and programming
DTC B2610
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 B2610 00
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Passenger Compartment Dimming 1 Circuit
DTC B2610 01
Passenger Compartment Dimming 1 Circuit Short to Battery
DTC B2610 02
Passenger Compartment Dimming 1 Circuit Short to Ground
DTC B2610 04
Passenger Compartment Dimming 1 Circuit Open
Diagnostic Fault Information
Circuit/System Description
When the instrument panel lamps dimmer switch is activated, a variable voltage signal is applied
through the LED dimmer switch signal circuit to the body control module (BCM). The BCM then
applies a message on the low speed GMLAN serial data communication circuit to the door
switches to illuminate the switch backlighting. The BCM, driver door switch, and passenger door
switch then applies a variable voltage signal through the LED dimming supply circuit to the
components on that circuit.
Conditions for Running the DTC
The ignition is ON.
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 voltage, short to ground, or an open on the LED dimming supply circuit.
Action Taken When the DTC Sets
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
LED Dimming Supply
B2610 00 or
B2610 02
B2610 00 or
B2610 04
B2610 00 or
B2610 01
-
LED Backlighting Ground
-
1
-
-
1. Interior Backlighting Inoperative
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The BCM, driver door switch, and passenger door switch will cease attempts to dim or illuminate
the LED 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
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 and park lamps ON, vary the interior lamp dimming switch from dim to full bright. The
LED lamps should dim and then become full bright.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the affected component.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2. Ignition OFF, verify that a test lamp illuminates between the listed ground circuit terminal
and B+.
Left steering wheel switch terminal 8
Right steering wheel switch terminal 1
PTO switch terminal 5
Trailer brake controller switch terminal 8
DIC switch terminal 5
HVAC control module terminal 10 X2
IP multifunction 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.
Left steering wheel switch terminal 6
Right steering wheel switch terminal 2
PTO switch terminal 6
Trailer brake controller switch terminal 7
DIC switch terminal 4
HVAC control module terminal 1 X2
IP multifunction 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
short to ground. If the circuit tests normal, replace the BCM.
If the test lamp is always bright, test the control circuit for a short to voltage. If the
circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the affected component.
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 B2615
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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