The rear passenger side door lock of my 2005 non-tech FX35 stopped responding right after the warranty expired. Go figure! A couple of weeks later the passenger side lock went. Then it started to get weird. I noticed that if the passenger door were locked, the rear hatch lock would stop responding. I can only lock and unlock the hatch if I unlock the passenger door manually first. After a little research, it seems like it is a common problem among us. At first I was waiting to see if Infiniti would do something for us like fixing the bubbling dash, but living with non-working locks drove me nuts. So instead of waiting for a recall from Infiniti, I decided to get the part and replace it myself. I hope this write-up will help those of us who’s out of warranty and do not want to pay the dealer price to get the locks fixed. The job is easier than I thought. It took me about 2.5 hours to complete, and that’s with a whole lot of self-doubt, going back and forth to the service manual and multiple stops to find the right tools. I am sure that I can finish the job in 1.5 hours if I have to do it again. Here are the procedures.