2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 741
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
If DTC B3935 is set, replace the suspected inoperative or malfunctioning key. If the DTC resets, replace the K9 Body Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Replacing Keys (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Service and Repair/Replacing Keys)
* Control Module References (See: Testing and Inspection/Programming and Relearning)for BCM replacement, setup, and programming
B3938
DTC B3938
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B3938 01
- Fuel Door Actuator Lock Circuit Short to Battery
DTC B3938 02
- Fuel Door Actuator Lock Circuit Short to Ground
DTC B3938 04
- Fuel Door Actuator Lock Circuit Open
Diagnostic Fault Information
Circuit/System Description
The locking and unlocking of the fuel door is a function of the power door lock system. The fuel door unlatch actuator shares the circuit with the
door latch unlock control circuit. The body control module (BCM), upon receipt of a lock switch lock or unlock signal, will switch the appropriate
door latch, as well as a fuel filler door unlatch actuator control circuits to B+ voltage. The opposing side of the door latch and fuel filler door
unlatch actuator is connected to ground provided by the BCM through the other the door latch control circuits, along with the fuel filler door
unlatch actuator, will lock or unlock as commanded.
Conditions for Running the DTC
When the relay is actively commanded by the BCM
Conditions for Setting the DTC
B3938 01
The BCM detects a short to voltage in the FUEL DOOR relay control circuit
B3938 02
The BCM detects a short to ground in the FUEL DOOR relay control circuit.
