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 Descriptors
DTC B2560 01
- Cargo Lamp Control Circuit Short to Battery

DTC B2560 02
- Cargo Lamp Control Circuit Short to Ground

DTC B2560 04
- Cargo Lamp Control Circuit Open

Diagnostic Fault Information





Circuit/System Description

The cargo lamp is controlled by the body control module (BCM). When the trunk is opened, the BCM receives a door ajar signal from the trunk latch assembly indicating the trunk is open. The BCM responds by applying voltage to the rear compartment courtesy lamp control circuit illuminating the rear compartment courtesy lamp. The rear compartment courtesy lamp is permanently grounded.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.
* Trunk OPEN.

Conditions for Setting the DTC

B2560 01

The BCM detects a short to voltage in the cargo lamp control circuit.

B2560 02

The BCM detects a short to ground in the cargo lamp control circuit.

B2560 04

The BCM detects an open in the cargo lamp control circuit.

Actions Taken When the DTC Sets

The BCM will disable the rear compartment courtesy lamp control circuit.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information
Schematic Reference

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

Component Connector End Views (Connector End Views By Name)
Description and Operation

Interior Lighting Systems Description and Operation (Interior Lighting Systems)
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 Testing

1. Ignition OFF, disconnect the harness connector at the E8S rear compartment courtesy lamp.
2. Ignition OFF, exterior lamps OFF, test for less than 5.0 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. Ignition ON, command the Trunk Lamp Test ON and OFF 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 BCM.
• 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.

5. If 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.

* Rear Compartment Courtesy Lamp Replacement (Rear Compartment Courtesy Lamp Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming