Buick Regal: DTC B2615
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 B2615 02
Passenger Compartment Dimming 2 Circuit Short to Ground
Diagnostic Fault Information
1. Dome Lamps Malfunction
Circuit/System Description
The dome lamp switch has 3 positions: DOOR, OFF, and ON. The ON position
provides a ground for
continuous operation and the dome lamp will remain illuminated until the switch
is placed in either the
DOOR or OFF position. When in the DOOR position, the dome lamp operation is
controlled by the
body control module (BCM). When any door is opened, the door ajar switch
contacts close and the
BCM receives a door-open input. The BCM illuminates the dome lamp when any door
is opened or a
door lock/unlock request is activated with the key fob. After all doors have
been closed, the dome lamp
will remain illuminated approximately 3 seconds after the last door closes. When
the driver places the
dome lamp switch in the OFF position, the dome lamp will be disabled. In the
event that the dome lamp
were to remain illuminated for more than 10 minutes with the ignition switch in
the OFF position and no
doors opened, the BCM will deactivate the dome lamp control circuit to prevent
total battery discharge.
Conditions for Running the DTC
Battery voltage must be between 9-16 V.
Conditions for Setting the DTC
DTC B2615 02
- The BCM detects a short to ground in the dome lamps control circuit
terminal 1 X7.
- The BCM detects a short to ground or an open/high resistance in the F5
DA fuse B+ circuit.
Actions Taken When the DTC Sets
The BCM will disable the dome lamps control circuit terminal 1 X7 or terminal
5 X2.
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 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 lighting component may need to be disconnected to isolate a
short to ground. Use the schematics to identify the following:
- Lighting components the vehicle is equipped with
- Each component's control and ground circuit terminals
- Component locations on the lighting control circuit
1. Ignition OFF, all doors closed, all accessories OFF, open and close
drivers door, disconnect the
harness connector at the appropriate component listed below. It may take up to 2
min for all
vehicle systems to power down.
- A98 Front Overhead Console Assembly
- E37R Dome/Reading Lamps - Rear
- E1AA Floor Accent Lamp - Left Front
- E1AB Floor Accent Lamp - Right Front
2. Test for less than 15 Ω between the appropriate ground circuit terminal
listed below and ground.
- A98 Front Overhead Console Assembly terminal 5
- E37R Dome/Reading Lamps - Rear terminal 3
- E1AA Floor Accent Lamp - Left Front terminal 2
- E1AB Floor Accent Lamp - Right terminal 2
- If 15 Ω or greater
- 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
listed below and ground,
ignition ON.
- A98 Front Overhead Console Assembly terminal 8
- E37R Dome/Reading Lamps - Rear terminal 2
- E1AA Floor Accent Lamp - Left Front terminal 1
- E1AB Floor Accent Lamp - Right terminal 1
4. Verify the test lamp turns ON and OFF when commanding the Courtesy Lamps
ON and OFF with
a scan tool.
- If the test lamp is always OFF
- Ignition OFF, disconnect the X7 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 X7 harness connector listed below at the K9
Body Control
Module.
- 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 appropriate dome/floor accent lamp.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Center Reading Lamp Replacement (without Sunroof)
- Rear Seat Position Center Reading Lamp Replacement (with Sunroof)
- Front Floor Flood Lamp 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 Descriptors
DTC P222
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.
Refer to Diagnostic Procedure Instructions for an overview of each
diagnostic category.
DTC Descripto