(Example shown is on a 2016 Ford Fusion. Other vehicles may require alternative steps.)
If your vehicle has keyless ignition and the battery in your key fob dies, you will need an alternative way to get inside, and start, your vehicle.
Next, locate the small hole on the underside of your vehicle's door handle.
Insert the key and press upward. Use your other hand to remove the plastic cover by sliding the cover to the right.
Once the cover is off, unlock the door by inserting the key and turning to the right.
Now, open the center console and locate the slot inside. Put your key fob inside the slot with the buttons facing forward.
Now, press the brake pedal, and start your vehicle.
Your vehicle is now ready to drive.