Removing The Hicas Computer

[Gts-t]

As per the topic, can the hicas computer that is mounted underneath the parcel tray in the boot be removed after you remove the hicas system.

Likewise can you remove the computer that is basically identical but on the passenger side of the vehicle, i suspect this computer is the for the abs. Like the hicas computer it is mounted underneath the parcel tray but is on the passenger side of the vehicle, where as what i suspect to be the hicas computer is on the drivers side.

This leads me to wonder if removing these computers will "open" any circuits in the car causing things to function incorrectly. Im also not sure if skylines have speed sensitive steering in any way, ie making the wheel easier to turn at different speeds etc and exaclty what the ecu is using the speed signal for etc.

heres a pic of the two computers im talking about

Any thoughts would be much appreciated.

Edited May 20, 2007 by 2630GTS

[XKLABA]

sorry to say you can not remove it as it also controls the power steering up front ( well on the GTR it does), on the GTR the other computer is for both 4wd and ABS

[Trav33]

Sorry to steal the thread,

But is there any special sensor (inertia?) inside the hicas box under the parcel shelf, which means you cant relocate the control box? I want to move mine so its not in the way of my audio gear - but someone said there might be a sensor inside which needs to be level, in the center of the car.

[djr81]

  2630GTS said:

As per the topic, can the hicas computer that is mounted underneath the parcel tray in the boot be removed after you remove the hicas system.

Likewise can you remove the computer that is basically identical but on the passenger side of the vehicle, i suspect this computer is the for the abs. Like the hicas computer it is mounted underneath the parcel tray but is on the passenger side of the vehicle, where as what i suspect to be the hicas computer is on the drivers side.

This leads me to wonder if removing these computers will "open" any circuits in the car causing things to function incorrectly. Im also not sure if skylines have speed sensitive steering in any way, ie making the wheel easier to turn at different speeds etc and exaclty what the ecu is using the speed signal for etc.

heres a pic of the two computers im talking about

Any thoughts would be much appreciated.

Thought: Nissan generally didn't put stuff in the car for no reason.

The module on the passenger side is the ATTESSA computer - so by all means if you are tired of AWD then bin it.

The other computer is the HICAS unit. If you want to remove its function the easiest way to do it is get a Tomei HICAS canceller or a bar that replaces the steering rack. Don't remove the computer if your rear steering rack is still active otherwise you will be on your way to the mother of all accidents......

[Gts-t]

Thought: god gave u eyes for a reason, And if u used them u would notice i have a HCR32, not a gtr/gts4

I ask this because i have removed the hicas system was wondering since its gone if the computer could go to.

The unit on the passenger side i have since found out is the abs unit, and since im considering removing the abs thought it would be a good time to ask about that also.

thanks for the 2 cents worth tho

[Gts-t]

  Trav33 said:

Sorry to steal the thread,

But is there any special sensor (inertia?) inside the hicas box under the parcel shelf, which means you cant relocate the control box? I want to move mine so its not in the way of my audio gear - but someone said there might be a sensor inside which needs to be level, in the center of the car.

I moved mine for the same reason. I didnt have any problem so id say there is a 99% chance u will be fine. Maybe ask some of the guys in the car audio section.

[BHDave]

The hicas computer is still inline with the speed sensitive steering. If you can figure out a way to maintain the speed signal to the steering when removing the unit it should work.

I have been wondering whether you can just splice the speedo signal wire at the ecu into the solenoid but i'm not game to try and don't have the knowledge to be certain if it would work or blow something up anyway.

I'm pretty sure there's another thread on this topic where they got into the nitty gritty of the signal required and all sorts of shit and it sounded to me like it was just the square wave speed signal which the speed sensor on the back of the speedo puts out.

[heller44]

BHDave: totally wrong type of signal you have there. Frequency modulated fixed duty waveform input as speed reference signal, pulse width modulated fixed frequency output to solenoid.

James. (I'm maybe looking at learning to program PIC's to make up a small converter to do this though.. If I find the time and motivation)

[BHDave]

glad i didn't try it

[sav man]

I just ripped my HICAS computer out, the power steering still works, just on the highway mode. It's not that heavy.

But after I dopped my engine out, I didn't hook the power steering wires up properly, so it was stuck in highway mode anyway.