2002 2.9 unlocking problem
 

Hi and thank you in advance with your help.
I have a 2002 S80 2.9 and I am unable to unlock the car with the lock buttons on the doors. I can unlock with the keys or with the key fobs. the buttons will lock the doors but when pressed you can hear it cycle but just keeps locking the doors will not unlock. Also when the car is locked and you shut the trunk it unlocks the driver side back door. thank you