I decided to try the emergency key for vehicle entry if the battery is dead. Be VERY careful if you do this. It's very easy to scratch the paint near the door handle as the key needs to be inserted from below at an almost vertical angle in order to pry off the plastic cover before the key can be used. When installing that plastic cover after opening the door,care must be taken to follow the instructions in the manual exactly. If you put the cover back on starting from the front, you'll never get the rear snapped in place and you won't be able to unclip it from the front to try again. This is something you would not want to have to do on a cold day.