I have had this happen to all three xc90 that we have owned and have never identified the problem other than "cannot duplicate( replicate! was just watching alien) customer complaint"My driver's door lock is intermittent. Sometime when unlocking with the fob, all the doors except for the driver's door will unlock. I need to re-lock and re-unlock to unlock the driver's door. Let us know if you find the source of the problem.
It'll be the door lock actuator switches which detect the door lock/unlock status and the door open/close statusUnlock with fob. Open door. Driver's door cycles lock then unlock. Sometimes it'll do it even after a drive cycle where I did not lock the doors. Seems to have started since the temps have been colder. It has me wondering if this is how my husband was able to lock the only key inside, in the ignition with engine running. Yesterday, I noticed when it finished the cycle, it was in the lock position when I shut the door, with the key in the ignition.