rear door lock switch not sliding easily, how to fix?

[apollo18]

hey guys in my 2003 hummer h2, both the rear door locks are sticky. when i try manually pushing the door lock switch, they are hard to push and dont slide as easily as the front ones. so whenever i unlock or lock the truck, the back ones either dont lock or dont unlock or are half way, where there door will open half way but not fully. how can i fix this? do i just lube up the door lock actuator with wd 40 or something or do i have to replace something in both doors?
thx

attached is a photo of what i am talking about

 

[Zach]

That is just the manual door lock slide. It’s going to be the door lock actuators. The OE ones are expensive. Dorman makes them, pretty good quality and a lot cheaper

 

[Romeo]

I am having the same issue with my H3 rear driver's side door. Gets annoying having to manually lock and unlock it daily.

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[Real4WD]

Door lock actuator is the source of the issue. Theyre not hard to replace. Requires removing the door panel and a couple screws for the actuator itself