The instructions are in the Owners Manual that came with the car. If you don't have one, see "Related Questions" below.
Here's what my 1998 Owner's Manual has on this:
# Enter the factory-set code # Prese the 1/2 control within five sconds of step 1. # Enter your personal 5 digit code. Enter each digit within five seconds of the previous one.
Do not set a code that includes five of the same number or presents them in sequential order. Thieves can easily figure out these types of codes. Your personal codes does NOT replace the permanent code that the dealership gave you. You can use either code to unlock your vehicle. If a second personal code is entered, the module will erase the first personal code in favor of the new code.
To change the code on an outer door keyless entry, refer to the ownerÍs manual for the car. There many different cars make and models and each brand can have a different process.
Each vehicle with keyless entry has its own factory code
The keyless entry code is located below the driver window on the exterior
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The code is in your trunk on the pillar by the back window where the speakers are mounted there is a sticker there that has the Security code for the keyless entry. Good luck
You can not change the master code yourseft. Only the dealer can.
A keyless entry code for a 2003 Lincoln Aviator can be found the owner's manual. If a code is not provided, the owner must visit a Lincoln dealership for a new code.