LaRaeLong

Hello, I am writing for my mother. She has a 1990 Reatta. The key fob battery went dead. The doors are locked. The actual key will not open the door. We have replaced the battery and can hear what sounds like the locks working but again, neither door will open. The key fob will activate and open the trunk. Does anyone have any ideas? Is this a security feature? Thank you in advance LaRae