2010 Cadillac Truck SRX AWD V6-3.0L Page 292
The cargo lamps are inoperative.
Conditions for Clearing the DTC
A current DTC clears when the diagnostic runs and passes.
Reference Information
Schematic Reference
Interior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Interior Lights Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior Lighting Systems)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Command the Cargo Lamp ON and OFF with a scan tool. The cargo lamps should turn ON and OFF when changing between the commanded
states.
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 2 and ground.
瀚慖f 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 Cargo Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded
states.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
瀚慖f the test lamp is always OFF, test the control circuit for a short to round or open/high resistance. If the circuit tests normal, replace the
K9 BCM.
5. If all circuits test normal, replace the cargo lamp.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Rear Compartment Courtesy Lamp Replacement - Liftgate (See: Lighting and Horns/Courtesy Lamp/Service and Repair/Rear Compartment
Courtesy Lamp Replacement - Liftgate)
* Rear Compartment Courtesy Lamp Replacement - Quarter Upper Trim (See: Lighting and Horns/Courtesy Lamp/Service and Repair/Rear
Compartment Courtesy Lamp Replacement - Quarter Upper Trim)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, programming and setup
B257A
DTC B257A
Diagnostic Instructions
