Key Fobs stopped working

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Jul 2, 2025 | 07:58 PM

#16

Magnus76

1st Gear

Joined: Jul 2025

Posts: 1

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[QUOTE=Rickx;7552523]This is from my 2003 Service Manual.

<TABLE width="95%"><TBODY><TR><TD>SECTION 501-14: Handles, Locks, Latches and Entry Systems
</TD><TD align=right>2003 F-Super Duty/Excursion Workshop Manual
</TD></TR><TR><TD>GENERAL PROCEDURES
</TD><TD align=right>Procedure revision date: 05/21/2002
</TD></TR></TBODY></TABLE>
<HR>Remote Transmitter Programming

****** content="Remote Transmitter Programming" name=tps_proctitle>NOTE: All keyless entry remote transmitters must be programmed at the same time.
NOTE: Programming (or reprogramming) the keyless entry remote transmitters into the vehicle security module can be accomplished using a diagnostic tool or by carrying out the following steps:

NOTE: Before programming the remote transmitters, the vehicle has to be unlocked. Prior to storing the first transmitter identification code (TIC) received, the module must erase TIC and rolling codes for all previously programmed keyfobs. Up to four keyfobs can programmed to the vehicle security module.
Turn the ignition from OFF to RUN 8 times within 10 seconds, ending in RUN. If the vehicle security module has successfully entered the program mode, it will lock and unlock all the doors.

Press any button on a keyless entry remote transmitter, and the doors will lock then unlock to confirm that each keyless entry remote transmitter has been programmed.

If the door locks do not respond for any keyless entry remote transmitter, wait for several seconds and press the button again.

To exit the TIC programming mode one of the following must occur: the ignition switch is turned to the OFF position; 20 seconds has elapsed since programming the receipt of a TIC; or 4 TICs have been programmed to the receiver. Exiting is acknowledged by locking and unlocking the vehicle if at least one TIC has successfully programmed to the vehicle security module.

Okay, I'm having a different problem. I can get my fobs to work for about a day, the next day I come out and they don't work again. If I disconnect the main batteries and then hook them up, the fob works again until I turn off the truck. Any ideas of what that could be?