I have a 2008 Mazda CX-9 and recently the power unlock has stopped working for the passenger doors but not my driver door. The lock button works for all doors, it’s just the unlock does not on my other 3 doors. I’ve already checked the fuse and the actuator, I don’t know what else it could be. Please help, thank you.
Try pressing you unlock button twice. Watch to see if the other 3 unlock. I’ll bet they do.
If it works, take the owners manual out of your glovebox, look up “door locks” and read how they work and if you can set them for a single push to unlock all 4.
Not fair…playing the owners manual card!! 
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OP states “recently”, I would take this to indicate knowledge of the correct procedure.
Mustangman, I did try the lock buttons but unfortunately it still did not work. Any other ideas?