The code you have is actually 25b not 256. It is the Footwell/Defrost Flap Servo Motor. The following links will give you the info you need to convert climatronic fault codes and look up the meaning. Hope this helps.
00603 - Footwell / Defroster Flap Motor (V85): Faulty
Possible Causes
Wiring/Connectors from/to Footwell / Defroster Flap Motor (V85)
Positioning Motor for Footwell / Defroster Flap Motor (V85) blocked
Positioning Motor for Footwell / Defroster Flap Motor (V85) faulty
Possible Solutions
Check Footwell / Defroster Flap Motor (V85)
See Measuring Value Blocks (MVB)
Perform Output Test
Perform Basic Setting
Check/Repair Wiring and Connectors
Check/Repair Obstructions or Blockage
Special Notes
Common HVAC Basic Settings Group(s) include 000 -or- 001
If you can just live with it. If not this will give you an idea of what is involved to gain access.
It is #28 in the diagram below. You might want to stand on your head and see if maybe just maybe you can access it from the footwell on the drivers side. Got a kid with small hands?
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