B2562

DTC B2562 or B2563

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 Instructionsprovides an overview of each diagnostic category.

DTC Descriptors
DTC B2562 00
- Cargo Lamp Control Circuit Low

DTC B2563 00
- Cargo Lamp Control Circuit High

Diagnostic Fault Information






Circuit/System Description

The cargo lamp is located on the rear of the vehicles cab exterior and is supplied voltage by a dedicated cargo lamp control circuit. Cargo lamp operation is controlled by placing the I/P dimmer switch in the full up (ON) position. With the I/P dimmer switch in the ON position the dome lamps, footwell lamps, and cargo lamps will illuminate. The following conditions must be met for the cargo lamp to operate:

* Parking brake APPLIED - vehicles equipped with manual transmission
* Transmission in PARK - vehicles equipped with automatic transmission

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B2562 00

The cargo lamp control circuit is shorted to ground.

B2563 00

The cargo lamp control circuit is shorted to voltage.

Action Taken When the DTC Sets

The cargo lamps will not operate or will remain illuminated.

Conditions for Clearing the DTC

* The conditions 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 Control Module Referencesfor scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate cargo lamp.
2. Test for less than 5 ohm between the ground circuit terminal B 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 A and the ground circuit terminal B.
4. Command the Courtesy Lamps 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 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 BCM.

5. If all circuits test normal, test or replace the appropriate cargo lamp.

Repair Instructions

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

* High Mount Stop Lamp Replacement Service and Repair
* Control Module References Control Module Referencesfor BCM replacement, setup, and programming