Check without lens:
If you turn the
AF-
M-switch, does the screwdrive move in and out of that tiny hole:
M: Screwdrive should retreat
AF: Screwdrive should poke out!
If this does not happen, the the inner part of the AF-M-switch got dislocated!
This usually happens if you or a previous owner or even a dealer who found out the solenoid was stuck repaired it but didn't take
care in aligning the external part of the AF-M-switch with the internal part.
Almost impossible that it goes out of alignment just by itself!
But sometimes the impossible becomes possible, so we never know for sure.
What puzzles me is that you have this problem with the DA18-135WR. This lens has its own DC-motor.
I only have the DA20-40WR limited which has the DC-motor as well, but in M-position the motor does not autofocus.
If the AF-M-switch doesn't move the screwdrive, then you need either send your body in for repair or, which is pretty easy, open and follow the steps in my
tutorial
If this isn't the problem, I would first try out a reset.
Last edited by photogem; 01-25-2020 at 11:24 PM.