the Integrated Services control module is located in the passenger compartment right side under the facia. It works the windows, timed interior lighting, and lock and unlock functions for the doors. Typically the door key is the remote. If the locks fail to unlock it may be caused by a micro switch showing an open circuit in one of the front latches. If you have a failing lock solenoid this will inhibit the lock for a 30 second cycle. this information is in the service manual. I know it doesn't address your original question but the car should have functional open/lock remote with factory key.