The most common way to do this is to use jumper cables connected to a screwdriver.
Flat battery door locked.
There is a mechanical link that barely works to unlock the door this way.
Solution 1 courtesy of bmw is to insert the key into either of the front doors and turn the key slowly while lifting the outside door handle slowly and simultaneously.
Insert the metal key into the hole in the bottom of the driver s door handle.
Battery died on a 2017 volvo xc90 and the door couldn t be opened by the remote and since there is no regular key it had to be opened with spare key that is.
Now we will open the hood with a screwdriver tested on bmw e34 the length of the screwdriver should be no less than indicated in the picture.
If your metal key won t unlock the driver s door try inserting the key in and out a few times.
With the other end connect the black wire to a ground source and connect the red wire to the metal rod of the screwdriver.
Now you can poke the screwdriver onto the solenoid power bolt.
Insert the key into the door lock and turn towards the back of the car to unlock your ford.
Right now after months of being parked each car has a flat battery.
If you are ever locked out of your mercedes because of a dead fob battery or dead car battery this video will show you how to open your locked mercedes vehicle.