2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 742
B3938 04
The BCM detects an open/high resistance in the FUEL DOOR relay control circuit.
Action Taken When the DTC Sets
The fuel door latch will malfunction and the fuel filler door may not be able to be opened.
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
Release Systems Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Release Systems Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Fuel Fill Door Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Fuel Door/Description and Operation)
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
Ignition ON, command the doors to LOCK and UNLOCK by using the central door lock switch. The M27 fuel door release actuator should LOCK
and UNLOCK while changing between the commanded states.
Circuit/System Testing
1. Ignition OFF, disconnect the X2 harness connector at the X53 fuse block-rear.
2. Connect a test lamp between the control circuit terminal 31 and ground
3. Command the doors to LOCK with a scan tool. The test lamp should briefly illuminate during the LOCK command.
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 ground or open/high resistance. If the circuit tests normal, replace the
K9 BCM.
4. If all circuits test normal, test or replace the X53 fuse block-rear.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Fuse Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and Repair/Removal and Replacement/Fuse
Block Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, programming and setup
