It's an Australian 1999 Ford Falcon. The car locks and unlocks fine. Everything runs fine. The only problem is when the car is locked, if you pull on the exterior passenger door handle, the whole car unlocks. The whole car makes that click sound, as if you pressed the unlock button on the remote.
I'm pretty savvy with electronics repair, and I'm assuming this is an electronic issue. I just have no idea how to access anything. How would I go about finding where these components are in the car? Is this feasible to fix on my own? I don't have a lot of money to properly see anybody about this.