Circuit/System Description
WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
The locking and unlocking of the fuel door is a function of the power door lock system. The fuel door lock 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 door lock actuator control circuits to B+ voltage. The opposing side of the door latch and fuel door lock actuator control circuit is pulled to ground by the BCM through the other the door latch control circuits, along with the fuel door lock actuator, will lock or unlock as commanded.