Hi all,
I also had problems with my HICAS with the light coming on after start up but would go away when you turn ignition off then on again once car warmed up. This occurred around 6 months ago. In the last 2 month the HICAS light would suddenly come on during driving and the steering would go heavy. Any who, it ended up being the HICAS control module. I replaced a leaking capacitor and cleaned up all the corrosive liquid on the PCB. Car is a 93 R33 gts-t. Been a week with no issues as of yet. Hopefully I will never see the light come on agin.
Also, the diagnostics doesn't work on this first release R33. Must be firmware related.
Hope this helps..
Buy!!