Hey all, 2003 f150 fx-4 package here. Anybody ever have issues when you turn the key to start the truck that your door locks automatically lock? This has happen to me multiple times, but not every time i start the truck. I know that they should automatically lock when you put your truck in drive, but never when the engine is cranking over. It has caused me to lock my keys in my truck with it running because i start it up in the mornings to warm up and i close the doors without realizing it has happened. It sounds funny, but it seems like it only does it when its cold. I also realized that it also seems like my battery is showing weakness when it starts up when its really cold. Does this have something to do with it?

 

Not to hijack your thread, but I find the auto-lock feature (regardless of when it happens), really really annoying. I appreciate power locks, but I want to be the one in control of when that occurs. I hate taking a quick trip to the grocery store with the kids, hopping out of the truck to go around the other side to open the door for them and having to fish around in my pocket again for the key fob to unlock the door...

I wonder if there's a fuse to pull or a connector to disconnect that would disable the feature that's maybe going flaky in your situation.

 

Do this in 30 seconds...
The enable/disable mode allows the autolock feature to be turned off and on. On manual transmission vehicles, when replacing the remote anti-theft personality (RAP) module, the autolock feature must be turned off by using the enable/disable mode.
The enable/disable mode is entered when the following series of steps is performed:
1. Confirm that the perimeter alarm is disarmed.
2. Close all doors.
3. Confirm that the ignition switch is in the OFF position.
Note:
Steps 4 through 8 must be performed within 30 seconds.
4. Turn the ignition switch from OFF to RUN.
5. Press the power door lock UNLOCK button three times.
6. Turn the ignition switch from RUN to OFF.
7. Press the power door lock UNLOCK button three times.
8. Turn the ignition switch from OFF to RUN.
9. Verify that the RAP module chirps the horn. This indicates that the RAP module is now in the enable/disable mode and ready to accept program changes.
10. Press the power door lock UNLOCK button one time to command the RAP module to toggle the autolock/relock feature ON or OFF.
11. Press the power door lock LOCK button once to enter the command.
12. Verify that the vehicle horn chirps one time to signal the RAP module confirmation of the command. There should only be one chirp indicating that the autolock/relock feature has been disabled. If one chirp is heard, followed by a longer honk, the autolock/relock feature has just been enabled. Return to step 10.
13. Turn the ignition switch to the OFF position to exit the enable/disable mode.
14. Verify that the RAP module chirps the horn once to indicate that a feature has been changed.
The autolock and the appropriate alarm configuration are turned on at the factory on vehicles with automatic transmissions. Vehicles with manual transmissions have the autolock turned off at the factory. The RAP module returns to the prior setting any time battery power is interrupted.

I know it's not your issue, but it will disable that feature so you know if it is a bigger problem. Things that don't happen all the time are hard to diagnose so you need to take little steps. It could be an electrical issue somewhere but this will eliminate a fault in the automatic lock.

I can't hardly believe a weak battery would lock your doors. Doesn't make sense at all.

 

ill have to try that to eliminate it. thanks. i hope whatever it is, its simple

 

Perfect! So easy. Thank you.