B+ is applied to the fuel door release relay at all times by the multifunction relay and the DOOR LOCK fuse. When the automatic transmission shift lock control switch is in the PARK position, depressing the fuel tank filler door lock release switch will supply ground to terminal 1 of the fuel door release relay, energizing it. With the fuel door release relay energized, B+ will be applied to the fuel tank filler door lock actuator terminal B. Ground for the fuel tank filler door lock actuator terminal A is provided through the de-energized door lock relay, the actuator will energize and unlock the fuel door.