I own a 2003 Infiniti g35. Just recently I have started having problems with unlocking my car. The key fob doesn't work, it never did when i bought the car. So I have always had to use the key in the driver side door to unlock the car. The sequence used to be, turn once, unlocks the driver side door, turn 2 times to the right, unlocks all the doors, turn right and hold, rolls down the two front windows. Recently, its been, turn right once, open the now unlocked driver door, and be greeted with the car alarm going off. only way to have the alarm not go off, is to unlock all the doors. now its become almost impossible to get all the doors unlocked. It takes several tries unlocking and re-locking the car door to get it to unlock all of them. Is this an actuator problem, or something worse?

 

Does the key turn without binding? It may just need to be libricated with a dry type lubricant.

 

What do you mean?

 

My first thought would be to inspect the wires that run through the rubber boot from the door frame to the door. These are bent every time you get in the car and can fray and short or simply come apart.

Next guess would be that the electrical part of the lock cylinder has either simply worn out or become physically dislodged somehow. I've never seen these parts up close so don't know if you can replace just the switch part or if the whole cylinder needs to go, meaning a new key.