Just bought a used 2004 F250 w/ keyless entry. I'd like to reprogram the door keypad to something I could more easily remember.. and that a previous owner doesn't know. Is this something I can do or does it require getting into the ECM?

 

As far as I can tell, the only thing you can do is program additional keys if you have at least two keys that work now. And you can only program up to 8 keys for one vehicle.

If you want to do something more serious than that, I believe the dealer will have to hook up there diagnostic tool and do the procedure below.

NOTE: The Security Access Procedure is used to obtain passive anti-theft system (PATS) security access. PATS security access must be granted to erase ignition keys, enable/disable the spare key programming switch (PID SPARE_KY) or perform a parameter reset for PATS, and may be required to program ignition keys. The Security Access Procedure invokes an inherent 10-minute time delay prior to granting security access during which the diagnostic tool must remain connected to the vehicle. Once security access has been granted, a security access command menu is displayed which offers various command options (refer to PATS Configuration Command Index).

NOTE: Select only the command required by the appropriate pinpoint test.

From diagnostic tool: Using service card, select PATS. Enter SECURITY ACCESS PROCEDURE. This procedure will take 10 minutes to perform, during which the ignition switch must be in the RUN position and the diagnostic tool must be connected to the vehicle.
After the 10-minute security access procedure has been completed, a new menu will be displayed with command options. Select only those functions required before exiting out of the menu. Once you have exited from the menu, the security access procedure must be performed again to display a new menu with the command options.

 

that's too program the keys. i think he's talking about the number pad on the door. i know my winstar owners book told how to program it. check your book. on the winstar there is one code that's locked in from the factory but you can add others.

 

I guess I did get off on the wrong track. I can't seem to find anything on the keypad in the shop manual except how to remove it.