PRE-RELEASE
DTC B2545
| DTC B2545 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| 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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| BCM B+ | 1, 2 | 1, 2 | - | - |
| Backup Lamp Supply Voltage | B2545 02 | B2545 04 | B2545 01 | - |
| Left Backup Lamp Ground | - | 1 | - | - |
| Right Backup Lamp Ground | - | 2 | - | - |
| 1. Left Backup Lamp Inoperative 2. Right Backup Lamp Inoperative | ||||
| Circuit/System Description |
When the engine is running and the transmission is placed in reverse gear, the transmission control module 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. Once the driver moves the gear selector out of the reverse position, a message is sent by the transmission control module via serial data requesting the BCM to remove battery voltage from the backup lamp signal circuit. The BCM will not apply battery voltage to the backup lamps if the engine is not running.
| Conditions for Running the DTC |
Reverse Gear engaged.
| Conditions for Setting the DTC |
B2545 01
The BCM detects a short to voltage on the backup lamps control circuit.B2545 02
The BCM detects a short to ground on the backup lamps control circuit.B2545 04
The BCM detects an open/high resistance both backup lamps control circuits.| Action Taken When the DTC Sets |
For B2545 01, both backup lamps will be continuously illuminated.
For B2545 02 and B2545 04, both backup lamps will be inoperative.
| Conditions for Clearing the DTC |
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The DTC will be current for as long as the fault is present.
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When the fault is no longer present, the DTC will be a history DTC.
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A history DTC will clear after 50 ignition cycles.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
Engine running, command the Backup Lamps ON and OFF with a scan tool. The E5A backup lamp-left and the E5B backup lamp-right should turn ON and OFF when changing between the commanded states.
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the X2 harness connector K9 BCM.
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| 2. |
Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
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| 3. |
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
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| 4. |
Ignition OFF, connect the X2 harness connector K9 BCM
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| 5. |
Disconnect the harness connector at the E5A backup lamp listed below:
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X3 harness connector E5E tail lamp-left (Without T79)
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X1 harness connector E5E tail lamp-left (With T79)
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X3 harness connector E5F tail lamp-right (Without T79)
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X1 harness connector E5F tail lamp-right (With T79)
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| 6. |
Test for less than 30 Ω between the ground circuit terminal listed below and ground.
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E5E tail lamp-left (Without T79) ground terminal 2
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E5E tail lamp-left (With T79) ground terminal C
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E5F tail lamp-right (Without T79) ground terminal 2
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E5F tail lamp-right (With T79) ground terminal C
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If greater than the specified range, test the ground circuit for an open/high resistance.
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| 8. |
Connect a test lamp between the control circuit terminal listed below and ground:
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E5E tail lamp-left (Without T79) control terminal 1
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E5E tail lamp-left (With T79) control terminal D
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E5F tail lamp-right (Without T79) control terminal 1
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E5F tail lamp-right (With T79) control terminal D
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| 9. |
Engine running, command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the selected states.
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| 10. |
If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
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If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
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| 12. |
If all circuits test normal, test or replace the E5A backup lamp-left and the E5B backup lamp-right.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Backup Lamp Bulb Replacement
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Control Module References
for BCM replacement, setup, and programming
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