Have a 1996 850 wagon, my remote would only unlock doors except tail. It dont lock none.
It developed gradually, now it dont work at all and I have tail locked and cant open it, not even with lever. Please help !!

 

The tail should have a key hole. Has that been set to always lock? Check the owners manual.
https://www.customers.volvocars.com/...212.htm#pg2.13

 

Nobody has touched the lock switch. It has to do with some electric issue because the remote still locks all the doors and activates the alarm but it does not unlock them. When I move the tailgate lever inside there is no mechanical sound inside. Before this, it happened just sometimes when using the remote. When I got to unlock them all with the remote, the rear door lever worked OK. Any ideas ?