Hi mate, very interesting, never heard of this before,,,
since, i never had any problem with my hicas but after i changed front castor rods (adjust.) the hicas light started to come on after i drove over 80kms/hr then, i went back to get the wheels alignement done (4 wheels) and the problem still there!!
by the way, where can i get this done/check? i don't think where i've got my alignement done, there have the Diagnoistics tool! where steering is wheel sensor and how to get it cleaned??
cheers
Ford