On my car my light come on when I drive on the motorway for some time without moving the wheel! It thinks that there is a fault. Ignition off and on resets.
Copied from The sky is the limit
HICAS Diagnostic Mode
There is a HICAS warning light in the instrument cluster. If it comes, on it is indicative of a problem.
R32: Check the HICAS oil level (power steering reservoir in some models, or a remote reservoir accessible from the boot)
R32 and R33: Check all HICAS electrical connections, and if the light remains on, follow the diagnostic below.
Note that having an aftermarket steering wheel fitted without the appropriate HICAS boss adaptor can also cause the HICAS system to show a fault. Advanced Imports in Auckland
stock the HICAS Boss adaptor kits.
_ Switch ignition off, transmission in neutral or auto in Park.
_ Start engine
_ Very quickly (with a couple of seconds), turn the steering wheel left and right about 20 degrees from centre five times, and then pump the brakes five times, then press the brake pedal once more this will enter diagnostic mode.
_ Drive forwards or backwards about 5 metres at a speed less than 10km/hr, this will enter full diagnostic mode.
_ The HICAS light in the instrument cluster will be flashing quickly (for normal) or will flash a code indicating any problems.
_ Long flash = first digit, short flash = second digit.
_ Diagnostics will return to normal after five minutes, or any speed over 10km/hr, or ignition is turned off.
HICAS Diagnostic Codes 19891993
1 HICAS solenoid right hand
2 HICAS solenoid left hand
3 Cut off valve
4 Power steering solenoid
5 Vehicle speed sensor
6 Steering angle sensor
7 Neutral position sensor
8 (Auto) Parking brake sensor,
(Manual) Clutch sensor
9 (Auto) Inhibitor switch,
(Manual) Neutral sensor
HICAS Diagnostic Codes 19931999
11 HICAS control unit
12 HICAS motor power supply not present
13 HICAS motor output not present
21 Vehicle speed sensor not present
22 Steering angle sensor not present
23 Steering angle sensor neutral or not present
24 Rear main sensor input not present
25 Rear sub sensor input not present
31 Parking brake sensor input not present
32 (Auto) Inhibitor switch input not present
(Manual) Neutral switch input not present
33 Engine speed signal not present
I have had this happen as well and as dave says it seems to be a fault.
Also noticed that the levels on the car were a bit low in the power steering reservior and the container in boot for the diff levels. Got them topped up and all seems to be well.