1996 Ford Crown Victoria Owner's Manual - Page 120

5. Five seconds after you press the fifth digit, your door lock system will lock and unlock the vehicle doors to confirm successful programming. The keyless entry system registers this second code. To open your vehicle, you can now use either code. The module remembers only one personal code at a time. Entering a second personal code will erase the first, replacing it with the new second one. To erase your personal code: 1. 2. 3. Enter the original permanent code. Press and release 1/2 within five seconds of Step 1. Press the 1/2 button a second time and hold for two seconds. The keyless entry system automatically erases your personal code. The system will now only respond to the permanent code. Do not set a code that presents the numbers in sequential order, such as 1/2, 3/4, 5/6, 7/8, 9/0. Studies show that people who idly press the buttons usually press a sequential pattern. Also, do not select a code that uses the same button five times. Thieves can easily figure out these types of codes. Your door lock system will lock and unlock the vehicle doors to confirm successful erasure. The system will now only respond to the permanent code. 127