where on w211 2005 e220 would I find the speed sensitive solenoid? steering is heavy

[CDI-E220-2005]

where on w211 2005 e220 would I find the speed sensitive solenoid as my steering is heavy? Rack fluids tire pressure etc all is fine. Somwone mentioned this solenoid
does my car have this solenoid?
Any pictures or clear instructions please as I m okay with technical terms but not too good. Pictures would definitely help.
Thanks

 

[SchwarzesAMG]

On the steering rack

http://i88.photobucket.com/albums/k181/j4g3d/SPSSOLENOID.jpg