When we push the button on the car key remote to unlock the doors, the doors will unlock but they will lock again even before we can open.

Hello Bill,

This can be the BCM, instrument cluster, remote control lock receiver or a bad fuse #BCM 2, 3, 4, and 5. So let's check the fuses first here is a guide to help and the fuse locations in the images below I have also included the wiring diagrams for the lock system so you can see how it works.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If all of the fuses are good, we should do a CAN scan, you can get a CAN scanner (Controller Area Network) from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Here is a list of CAN scanners starting at about $25.00 on Amazon:

https://amzn.to/3DBMlc7

It sounds like to me that the BCM is out which you can get a preprogrammed unit by searching Google or Ebay. I have also included the location of the BCM and how to replace it as well. Check out the images (below). Please let us know what happens.

Yep, I think you found the problem, here is how to change the lock switch out in the images below. Please let us know what happens.