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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: Reversing Lights Circuit Short to Battery

DTC B2545 02: Reverse Lamps Circuit Short to Ground

DTC B2545 04: Reverse Lamps Circuit Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Reverse Lamps Control

B2545 02

B2545 04

B2545 01

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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 reverse lamps. The reverse 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 reverse lamp control circuit.

Conditions for Running the DTC

Reverse Gear engaged.

Conditions for Setting the DTC

B2545 01

The BCM detects a short to voltage on the control circuit.

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 reverse lamps are inoperative.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Reference Information

Schematic Reference

Exterior Lamps Schematics

Connector End View Reference

Component Connector End Views

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 Verification

Ignition ON, perform the Reverse Lamps test. The reverse lamps should be ON/OFF.

Circuit/System Testing
  1. Ignition OFF, disconnect the appropriate harness connector at the appropriate tail lamp listed below:
    2. • E5A Reverse Lamp - Left
    • E5B Reverse Lamp - Right
  2. Test for less than 5 Ω between the appropriate ground circuit harness connector terminal listed below and ground:
    3. • E5A Reverse Lamp - Left harness connector terminal 3
    • E5B Reverse Lamp - Right harness connector terminal 3
         ⇒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:
    4. • E5A Reverse Lamp - Left harness connector terminal 1
    • E5B Reverse Lamp - Right harness connector terminal 1
  4. Command the Reverse Lamps test with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    5. ⇒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 reverse lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Tail Lamp Replacement
    •  Control Module References
   


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