Q&A

The electric tailgate latch on my car used to work with the door key and the switch on the driver's door, then started working periodically, and now not at all. I now have to crawl over the back seat to lock it or release it with the pull knob. Once unlocked, the outside handle works fine.
A Volvo mechanic said it was probably frayed or broken wiring in the wiring harness where it attaches to the left side trunk hinge. I checked continuity in the wires that go to the electric locking mechanism and they seem fine so I don't believe the wiring, at least in that hinge location, is a problem. Does this sound like a broken electric tailgate lock? Can it be repaired or do I have to replace it?
Any advice would be appreciated. - jake