2010 Cadillac Truck SRX FWD V6-3.0L Page 741

2010 Cadillac Truck SRX FWD V6-3.0L 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.