DTC B2545
Diagnostic Instructions
DTC Descriptors
| DTC B2545 02: Backup Lamps Circuit Short to
Ground |
| DTC B2545 04: Backup Lamps Circuit Open |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Backup Lamps Control
|
B2545 02
|
B2545 04
|
1
|
-
|
1. Backup lamp always ON
|
|
| |
Circuit/System Description
When the transmission is placed in reverse gear, the engine
control module (ECM) 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. The backup lamps are permanently grounded. 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 lamp control circuit.
Conditions for Running the DTC
Reverse gear engaged
Conditions for Setting the DTC
B2545 02
The BCM detects a short to ground on the control circuit.
B2545 04
The BCM detects an open control circuit.
Action Taken When the DTC Sets
The appropriate backup lamp is inoperative.
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
Exterior Lights Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, perform the Backup Lamps test. The backup lamps
should be ON/OFF.
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
appropriate harness connector at the appropriate tail lamp listed
below: |
| |
• |
E43L Liftgate Tail Lamp
Assembly - Left |
| |
• |
E43R Liftgate Tail Lamp
Assembly - Right |
| 2. |
Test for less than 5 Ω
between the appropriate ground circuit harness connector terminal
listed below and ground: |
| |
• |
E43L Liftgate Tail Lamp
Assembly - Left harness connector terminal 3 |
| |
• |
E43R Liftgate Tail Lamp
Assembly - Right harness connector terminal 2 |
| ⇒ |
If greater than the specified value, test the appropriate
ground circuit for an open/high resistance. |
| 3. |
Connect a test lamp between
the appropriate control circuit harness connector terminal listed
below and ground: |
| |
• |
E43L Liftgate Tail Lamp
Assembly - Left harness connector terminal 4 |
| |
• |
E43R Liftgate Tail Lamp
Assembly - Right harness connector terminal 1 |
| 4. |
Command the Backup Lamps test
with a scan tool. The test lamp should turn ON and OFF when
changing between the commanded states. |
| ⇒ |
If the test lamp is always ON, test the control
circuit for a short to voltage. If the circuit tests normal,
replace the K9 Body Control Module. |
| ⇒ |
If the test lamp is always OFF, test the control
circuit for a short to ground or an open/high resistance. If the
circuits test normal, replace the K9 Body Control Module. |
| 5. |
If all circuits test normal,
replace the appropriate backup lamp . |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
