My 2007 driver side door lock failed after about 3.5 years (I am original owner). At first the door would sometimes not lock or unlock using the electric lock system. I discovered this failure because I noticed the doors would sometimes not lock when I put the car in gear (ie: my GX is programmed to lock all doors when put in a gear.) Anyway, after a month or so, the door would not lock or unlock at all using the electric system. (I also realized that my GX was left unlocked after using my FOB to lock the car going into stores, etc.... lucky me, nothing was ever stolen.) I have always taken my GX into my Lexus dealer for service. My service guy explained that the solenoid that drives the door lock would begin to loose its strength and ultimately would simply stop locking/unlocking the door (even though you could still hear it trying to work every time you locked/unlocked the door.) He described my symptoms to the letter. I asked my Lexus dealer to fix this and I believe the cost was $257 for the one door... ouch. Most of the cost is labor unpacking the door panel, etc. I have spoken to several folks who have attempted to get into a GX door and everyone says it is a real PITA... and to pay the dealer for this frustrating repair task. I did and my dealer had the car back to me the next day. (My dealer gave me a loaner for the day... it was an RS Hybrid.. interesting drive.)
Not sure why you are having to go into your GX from the passenger side... your (manual) key should still work even if the electric lock system does not.
