Chevrolet Trax: DTC B2545
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 B2545 01
Backup Lamps Circuit Short to Battery
DTC B2545 02
Backup Lamps Circuit Short to Ground
DTC B2545 04
Backup Lamps Circuit Open
Diagnostic Fault Information
Circuit/System Description
Automatic Transmission
With the engine running and the transmission in the reverse position, the
transmission control module (TCM)
sends a serial data message to the body control module (BCM). The message
indicates that the gear selector is
in the reverse position. The BCM applies battery voltage to the backup lamps
control circuit illuminating the
backup lamps. Once the driver moves the gear selector out of the reverse
position, a message is sent by the
TCM via serial data requesting the BCM to remove battery voltage from the backup
lamps control circuit. The
engine must be running for the backup lamps to operate.
Manual Transmission
The engine control module (ECM) provides a signal circuit to the backup lamp
switch which is permanently
grounded. With the ignition ON and the transmission in the reverse position, the
backup lamp switch signal
circuit is pulled low and the ECM responds by sending a serial data message to
the body control module
(BCM). The message indicates that the gear selector is in the reverse position.
The BCM applies battery voltage
to the backup lamps control circuit illuminating the backup lamps. Once the
driver moves the gear selector out
of the reverse position, a message is sent by the ECM via serial data requesting
the BCM to remove battery
voltage from the backup lamps control circuit.
Conditions for Running the DTC
- Battery voltage must be between 9-16 V.
- Engine RUNNING.
- Transmission placed in REVERSE gear.
Conditions for Setting the DTC
DTC B2545 01
The BCM detects a short to voltage in the backup lamps control circuit.
DTC B2545 02
The BCM detects a short to ground in the backup lamps control circuit.
DTC B2545 04
The BCM detects an open/high resistance in the backup lamps control circuit.
Actions Taken When the DTC Sets
DTC B2545 02 and B2545 04
The backup lamps will not operate.
DTC B2545 01
The backup lamps are always ON.
Conditions for Clearing the DTC
Reference Information
Schematic Reference
- Exterior Lights Schematics (Encore) , Exterior Lights Schematics (Trax)
- Body Control System Schematics (Encore) , Body Control System
Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Exterior 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
- Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the
appropriate E5 Backup Lamp bulb
at the appropriate E42 Tail Lamp Assembly.
- Test for less than 5 ohms between the ground circuit at the socket
terminal and ground.
- Ignition OFF.
- Test for less than 2 ohms in the ground circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, repair the open/high resistance in the ground
connection.
- If less than 5 ohms
- Connect a test lamp between the control circuit at the socket terminal
and ground, ignition ON.
- Verify the test lamp turns ON and OFF when commanding the Backup Lamps
ON and OFF with a scan
tool.
- If the test lamp is always OFF
- Ignition OFF, disconnect the X7 harness connector 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.
- If infinite resistance
- Test for less than 2 ohms in the control circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K9 Body Control Module.
- If the test lamp is always ON
- Ignition OFF, disconnect the X7 harness connector 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.
- If the test lamp turns ON and OFF
- Test or replace the appropriate E5 Backup Lamp.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Backup Lamp Bulb Replacement (Trax) , Backup Lamp Bulb Replacement (Encore)
- 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:
Repair Procedure
Thoroughly wash the repair area with Liquid Wash and Wax GM P/N 1052870
or the equivalent.
Environmental damage may be corrected. Refer to Environmental Fallout (Acid
Rain), or Rail Dust
Damage Repair.
IMPORTANT: Follow all of the instructions from the manufacturer
of the
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
Diagnostic Fault In