My key won't unlock or lock the door

Hello Moreno0298c4c79, Replacing the battery and using a different remote would be my first recommendation, but because that didn't work, I would recommend you check out the locking mechanisms of the car, and see if anything is malfunctioning or needs replacing. Next I would try to clean the contacts of your key. The 'button' inside your key connects with parts of the internal circuit board, and at times these connections malfunction because of dirt, moister, or or corrosion, so gently try and clean them. Lastly the problem might be with the receiver inside of your car, and it may need to get replaced. Let us know if you have any other questions! RepairPal Oliver