Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
The fuel flap actuator is in parallel with the drivers (RHF) door lock.
If it works then, you have a broken wire to the fuel flap lock actuator.
What body style is your car, ute wagon or sedan?
GN/W will be positive, BN/R will be ground while locking.
Polarities are reversed for unlocking.
If all the other locks function ok, then test each wire for a positive flash on your testlight.
One will go positive for lock, the other will go positive for unlock.
When one is positive, the other is ground and vice versa.
Most likely the lock actuator is faulty, I have never had a wiring fault in this regard.
Hope this helps.