Buick Regal: 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 Descriptor
DTC B2610 02
Passenger Compartment Dimming 1 Circuit Short to Ground
Diagnostic Fault Information
1. Interior Backlighting Malfunction
Circuit/System Description
The instrument panel dimmer switch is used to increase and decrease the
brightness of the interior
backlighting components. The instrument panel dimmer switch provides a voltage
signal to the body
control module (BCM) that will increase as the brightness of the lights are
increased and decrease as the
brightness of the lights are decreased. The BCM provides a low reference signal
and a B+ reference
circuit to the instrument panel dimmer switch. When the instrument panel dimmer
switch is placed in
the desired position, the dimmed voltage setting is applied from the instrument
panel dimmer switch
through the instrument panel dimmer switch signal circuit to the BCM. The BCM
interprets the signal and applies a pulse width modulated voltage through the
LED dimming control circuits illuminating the
interior backlighting to the requested level of brightness.
Conditions for Running the DTC
- Battery voltage must be between 9 - 16 V.
- Park lamps ON.
Conditions for Setting the DTC
The BCM detects a short to ground in the LED backlight dimming control
circuit terminal 8 X2 or
terminal 9 X7.
Actions Taken When the DTC Sets
The BCM will disable the LED backlight dimming control circuits.
Conditions for Clearing the DTC
- The condition responsible for setting the DTC no longer exists.
- A history DTC will clear once 100 consecutive malfunction - free
ignition cycles have occurred.
Reference Information
Schematic Reference
Interior Lights Dimming Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
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 Testing
NOTE: Each component with backlighting may need to be disconnected to
isolate a short to voltage or short to ground. Use the schematics to
identify the following:
- Backlighting components the vehicle is equipped with
- Each component's control and ground circuit terminals
- Component locations on the backlighting control circuit
1. Ignition OFF, all doors closed, all accessories OFF, disconnect the
harness connector at the
component with inoperative backlighting. It may take up to 2 min for all vehicle
systems to power
down.
2. Test for less than 15 Ω between the appropriate ground circuit terminal and
ground.
- Ignition OFF.
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance in the ground
connection.
- Go to next step: If less than 15 Ω
3. Connect a test lamp between the appropriate control circuit terminal and
ground.
4. Verify the test lamp turns ON and OFF when commanding the LED Backlight
Dimming ON and
OFF with a scan tool.
- If the test lamp is always OFF
- Ignition OFF, disconnect the appropriate harness connector listed below
at the K9 Body
Control Module.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- If the test lamp is always ON
- Ignition OFF, disconnect the appropriate harness connector listed below
at the K9 Body
Control Module, ignition ON.
- Test for less than 1 V between the control circuit terminal and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K9 Body Control Module.
- Go to next step: If the test lamp turns ON and OFF
5. Test or replace the component with inoperative backlighting.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Ignition and Start Switch Replacement
- Steering Wheel Airbag Coil Replacement
- Roof Console Replacement
- Front Side Door Window Switch Replacement
- Headlamp Switch Replacement
- Ignition and Start Switch Replacement
- Parking Brake Actuator Switch Replacement
- Rear Side Door Window Switch Replacement
- Roof Console Replacement
- Control Module References for BCM replacement, programming, and setup
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
SEE MORE:
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
DT
This light shows if there is an
electrical problem with the airbag
system. The system check includes
the airbag sensor(s), the passenger
sensing system, the pretensioners,
the airbag modules, the wiring, and
the crash sensing and diagnostic
module.
The airbag readiness light comes on
for several se