W211 face-lift headlight problem

[gwgas]

I have a 2007 E280cdi with ILS. A few weeks ago the right hand xenon went out and an ILS inoperative error accompanied this. I turned the lights off and on again and the light came on again. It then worked for a while and went off again.
My i980 tells me that the error is e2m3 right distribution cylinder motor is either low voltage or overheating. I swapped the ECU ballast with the left one but the fault remains with the light. I have replaced the xenon bulb ( its a D1S ).
If the motor is faulty why does the light go out. Can the ILS be disabled other than on the light set up? Could this be a wiring fault or am I into a new headlight or is it possible to change the motor?

 

[David404]

I'd get the car on a STAR machine to get as positive confirmation of the fault as possible before I started replacing stuff. Possibility that once confirmed a good Indie may well have seen this issue before...

 

[SW18]

I had a similar fault and tried similar remedies but in the end had to go to my indie and get a diagnosis on Star. The issue was a failing controller unit, which was a few hundred quid to replace.