Doesn't look like good news, from the attached link:
Some Eberspachers are manufactured with modified ECUs so the heater can be controlled by the vehicles engine management system, they are not switched on and off in the normal way so cannot be made to work with simple wiring changes.
Usually these will be described as removed from ***** truck.
Sometimes they will be sold as "Working when removed from vehicle", that may be true but they wont work away from it!
DO NOT BUY any of these non standard versions for normal use, you will be wasting money.
They will not work on their own without replacing the ECU which costs £250 to £350!
Also some controllers have been modified to work with the engine management system and wont work away from it. (see next page)
Not all non standard units have a different connector or non standard colours but the labels are a good warning.
Scania, Mann, Mercedes, DAF, Iveco, Renault are truck manufacturers who fit modified heaters but there are probably others.
These are mainly Airtronics D2 D4 models but we know a few D1LCC are included.
Eberspacher D2