Originally Posted by mcphelps

My wife's fob had gotten lost, so we were down to one fob. Car was operating as expected; no issues; locks and unlocks fine. Fast forward to the next time we had the car washed. They (the car wash) found her fob in the car and put it in the cargo area.

So, while her fob was lost inside the car, we were able to lock the car normally with my fob. It would seem that the rule might be that there be a fob outside the car in close proximity for it to lock, regardless if there is a fob on the inside. I haven't tried it out, just something that made me go "Hmmmmm" when we discovered the fob had been inside the car the whole time.