Is being flaky. If I unlock doors from the inside the rear passenger door does not unlock. Everything else works fine. Is this an issue with the switch inside that door?

 

I've seen wires break where they flex going through to the door. Also there is no harm in lubing the latch. Maybe its just a little too sticky.

 

Good point. How would I go about lubing it, and with what type of lube? Assuming just spray grease? Would I need to take it apart or could I somehow just squeeze a tube in there and spray away.

 

I use the spray. The chain and cable lube shoots quite a ways also. With the window down you can get in the crack and nail all sorts of stuff, (crank, gears mechanisms). Can be messy and likely isn't good on rubber. Goood luck.