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My FL5 Civic had the same issue with the rear driver door. Turns out it was a faulty lock actuator. Warranty covered it, but it was a hassle getting it diagnosed. Just a heads up in case that saves you some time.

Tried the official Honda site, but no luck. My dealership ended up giving me a printout for some basic maintenance service manual on the FL5 when I got my oil changed. Maybe try calling your service department.