B2560

DTC B2560

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC B2560 02
- Cargo Lamp Control Circuit Short to Ground

Diagnostic Fault Information





Circuit/System Description

The BCM monitors the function of the ajar switch in the rear compartment lid latch, when the BCM receives a signal that the trunk is ajar, it will command the rear compartment courtesy lamp to illuminate.

Conditions for Running the DTC

When the BCM commands the rear compartment courtesy lamp.

Conditions for Setting the DTC

The BCM detects a short to ground on the trunk lamp control circuit.

Action Taken When the DTC Sets

The cargo lamp will not illuminate.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.

Reference Information
Schematic Reference

Interior Lights Schematics (Interior Lights Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Interior Lighting Systems Description and Operation (Interior Lighting Systems Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, command the E8S rear compartment courtesy lamp ON and OFF with a scan tool, the E8S rear compartment courtesy lamp should turn ON and OFF while changing between the commanded states.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the E8S rear compartment courtesy lamp.
2. Test for less than 30 ohm between the ground circuit terminal 2 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit terminal 1 and ground.
4. Command the Trunk Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF while 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 BCM.
• If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K9 BCM.

5. If the all circuits test normal, replace the E8S rear compartment courtesy lamp.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Cargo Lamp Bulb Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup and programming