I can't find any info on repairs for the error code 5D4D. Googling I only find people having 5D65, similar codes, but they are not the same.
5D65 ARS: Position, direction valve
5D4D ARS: Direction valve
Maybe my code is for the solenoid itself and the 5D65 code for the position sensor? :S
So I located the Dynamic Drive valve block (it is behind the passenger side skirt and has a little access panel right under it) and the Direction Valve. 1 in photo below. I removed the solenoid and checked so that the valve in the valve block moved freely. It moves freely, the wiring looks good. Nothing weird.
I gave the valve block a bunch of light hits with a hammer, hoping that if anything is seized it would become free. No change.
I guess I am down to 4 possible causes;
1) Wiring (unlikely as it looks good)
2) The Valve block itself
3) Directional valve solenoid being bad
4) Valve position sensor being bad
I have ordered a used valve block with all the solenoids and sensors to swap in. It seems to be the default solution. Which if it works, I will have no idea what the issue was or what solved it specifically. Well well..
I will also do a full fluid flush and reservoir (filter) change while I am at it.