I have a RRS 2005 SC and noticed that my left headlamp was very high and my right was maximum down. No warning on the instrument panel. At start up I could see that only the left light was moving L/R and during driving the right light on the road infront of me was following my steering/cornering.

I took out the the big lamphousing and tryed to see if anything was wrong inside and cleaned the el-contact, on both sides.
After that I had the yellow warning flashing on the dash. But no change to the lamps.

I put my IID-tool in and found 2 faults on headlight:
B1A57-01 (AF) Left headlamp levelling motor - General failure information - general electrical failure.
U1A39-87 (AF) Communication malfunction of right actuator - Bus signal/message failure - missing a message

When I cleared the faults I saw my left light went down to max low.
Now my both lights are stuck in low pos.
I have both faults now but I can clear the left but it comes back. For the right side the fault is permanent.

I t is a problem during darkness as I have only 10meters of light in front of the RRS.

I don´t know where to continue searching for the problem.

Test that left motor and fix that issue first. It may just sort the lost signal on the right. 2012 5.0 SC AB
Mods:
TPMS
Genuine LR DRLs
Remote Boot close from key fob
2016 Discovery 4 Mirrors AKA RRS2
2014 L405 Surround Camera retro fit (WIP)
2013 RRS Dual View Screen fit (Complete)
2016 LR4 RSE
2014 LR4 Homelink
2016 FFRR Electrochromatic Wing Mirror Glass

70 plate Focus ST (Current)
1942 VEP Ford GPW Jeep (Willys) (Current)
1943 Whites M16 Halftrack (Current)
16 plate Eurofighter Typhoon, 2 x Eurojet engines with 20,000lbs thrust each. 1380mph

Ok, but how du mean I can test the motor?

I have solved the right lamp, it was probably a bad connection in the socket or the wiring behind.

The left side headlamp swiveling feedback sensor circuit was also giving a fault.
It was not possible to fix that. We tried a lamp unit from my friends RRS and it worked OK.

I found a used Lamp unit in Sweden and now it is running as it should.

Thanks for support.