2001 Acura Integra power door locks

2001 Acura Integra 77,000 miles

So I just bought this car, the power locks don't work. It didn't bother me, because it locks fine with the key manually. My aunt wants to put in a security system with a remote key entry (she doesn't know about the door locks not working, because I know she wouldn't have let me buy the car.) So my question is, what exactly happens when they install the security system? Are they going to be putting in new locks or will I have to get mine fixed first? Also, what would cause them not to work properly? It has a clean carfax, says it's never been in an accident, but we all know those sometimes aren't true. Also, to open the hatch, I have to keep the key turned and lift up. I read the manual and it mentioned this might have to be done, and it could indicate a problem. I'm assuming the entire lock system is just screwy on this car.