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 <b>...</b>