My 2007 Hyundai Sonata has begun to lock the doors by itself.

door reciever or lock has issues
did you scan the car first.
does the receiver put 12dc to the unlock solenoid.
if yes the solenoid is bad.
if not the receiver has issues. (check connections first there)

Click on this link below and then locate the "Download (2007-hyundai-sonata-owners-manual.pdf) link and click on it to download the 2007 Hyundai owners handbook

http://pdfservicemanual.com/automotive/2007-hyundai-sonata-owners-manual

you have to take the inside panel off the door, and you will see the steps on how to do it.
Once you take that inside panel off you will see it step by step and as you take the old one off remember how you did it to put the new one on
I hope this helps

I own a 2005 Hyundai Sonata as well and this has happened to me. All the doors automatically lock as I pull on the door handle to get back in the car. This happened twice in the winter of 2007-2008, then it didn't happen again until this past December 2009 and now today in January 2010.

I wonder if it has something to do with cold temperatures? Or maybe that's when I'm more likely to leave my keys in the ignition with the car running!

But it is a big pain, one time my two year old was in the car and the fire department had to come pry a door open! I started carrying the box with the unlock button in my coat but even this would not unlock the doors this morning. Only the spare key will do.

I am taking my car into the dealer to take a look. And I'm going to write a complaint to Hyundai. This is unacceptable.

It's in your owner's manual - plus!, THERE'S A 1-800 number to folks to HELP you PROGRAM your GARAGE DOOR opener.... amazing the number of people who don't read.

GOTO HOMELINK.COM

THEY MAKE THE SYSTEM AND HAVE INSTRUCTIONS YOU CAN DOWNLOAD.



HOPE THIS HELPS

you have a bad relay.. the 'lock' relay.

Here's the wiring diagram

take off door panel so you can see the power door lock actuator moving there maybe rust or a bind in the power door lock little motor itself

If you use your keyfob to lock the doors, it will activate the alarm, and you will need to unlock with the keyfob. If you lock the doors with the lock button on the inside of the door, it should not activate the alarm.