2010 RX350 KEYFOB LOCK BUTTON

[MGBJAY]

I have a 2010 RX350. As of yesterday morning, the LOCK button on the key-fob appears to have quit functioning AT ALL. I did a remote start, and that worked just fine, and that was the final time that it did anything. I didn't notice anything until I arrived at my destination and tried to lock the car. Didn't work. No lock ... no remote start ... nada.

Everything (all other buttons) are doing what they are supposed to do the way they should.

I replaced the battery last evening, however, the problem remained. If you have any ideas regarding this issue, I would love to hear what they are. 

Is it possible to "reset" the fob to its original settings?

Thanks for your assistance.