Skyline HICAS Diagnostics

How to enter HICAS diagnostic mode on a Nissan Skyline R33

Procedure:
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 10k/ph, 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 10k/ph, or ignition is turned off.
HICAS 1994-1999
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) Inhibititor switch input not present
(Manual) Neutral switch input not present
32 Engine speed signal not present

All codes are flashed with the Power Light on the dashboard (R32) and on the auto mode selection button on the R33's.
The sequence starts with one long flash.
If everything is OK, this will be followed by ten short flashes. Errors are indicated by a long flash in the sequence of short flashes.
• 1st flash longer Revolution sensor shorted or disconnected
• 2nd flash longer Speed sensor shorted or disconnected
• 3rd flash longer Throttle sensor shorted or disconnected
• 4th flash longer Shift solenoid A shorted or disconnected
• 5th flash longer Shift solenoid B shorted or disconnected
• 6th flash longer Overrun clutch solenoid shorted or disconnected
• 7th flash longer Lockup solenoid shorted or disconnected
• 8th flash longer Fluid temperature sensor is disconnected or the control unit power source is damaged
• 9th flash longer Engine revolution sensor shorted or disconnected
• 10th flash longer Line pressure solenoid shorted or disconnected
• All flashes the same with no long start flash Battery voltage low, has been recently disconnected or control unit has just been reconnected