Normal Operation
WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
When the customer code buttons are pressed on the remote keyless entry (RKE) keypad, a signal is sent to the driver door module (DDM) to activate the function requested. The customer code is entered to unlock the driver door. Entering the customer code and pressing the 3/4 button unlocks all the doors. Pressing 7/8 and 9/0 locks all the doors.
Customer code 1 is used to unlock the door and recall memory position 1. Customer Code 2 is used to unlock the door and recall memory position 2.