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Install of VSC cancel switch

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414K views 380 replies 148 participants last post by  gtrujill  
#1 ·
I was inspired by san antonio FJ to do this mod from his post at http://www.fjcruiserforums.com/forums/showthread.php?t=7462.

So I started by unplugging the VSC and stripping the e-tape and cover to expose the wires.
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Then I found access into the cabin through a removable grommit (careful I dropped it as it tends to pop out).
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I cut the purple wire and spliced in 2 lengths of wire about 3 feet each and fed them through the hole. the backing you see in the hole is just the padding inside the cabin under the dash and can pull back easily.
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I used a toggle switch as they are the easist to install, attach the wires and just drill a 1/2" hole then screw it in.
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It's kind of hard to see here but I cut a small notch in the grommit before I replaced it so the wires could feed through. Clean up the wiring with some zip ties and some e-tape and you are all set. Let me know if you have any questions.
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#3 ·
Only complaint on your install is that you used the same color wire for both leads. That could be quite a ***** to figure out for the next guy who gets your used truck. I'd like to see the look on the face of the Toyota tech guy, too! Funny stuff.
 
#281 ·
I'm not trying to come off as some "Dr Know It All" but from what I know, a switch is just an interuption in a wire or "lead" so i believe he has is right. He has just cut the "line" or "feed" wire and placed a switch in between. Hope that helps for future switching projects.
 
#5 ·
I.T. - same issue. You look at some rat's nest and think - WTF?

Excellent MOD! I like this one best so far. Does it turn off all the goodies, or just VSC?
 
#152 ·
Because drifting is fun. :silly:
 
#8 ·
Noisycow said:
If yours is an MT, I don't see how this would make much 'fun factor' difference on the street with 4-w always engaged unless I am missing something. Would be a nice option with a supercharger maybe :).
No, mine is an AT so it does allow me to spin the tires when needed/wanted. I live in north florida and we have a lot of sand on the trails... I also grew up driving on dirt roads and it's really hard to sling mud on the person behind you when your tires wont come loose.

Percy said:
Only complaint on your install is that you used the same color wire for both leads. That could be quite a ***** to figure out for the next guy who gets your used truck. I'd like to see the look on the face of the Toyota tech guy, too! Funny stuff.
I thought of that but I was out of good wire at the house and didn't feel like buying another 25' roll. That said I can always use more..


thedude said:
i dont get it, why would you want to turn off vsc
Check out this tread for the pros and cons... http://www.fjcruiserforums.com/forums/showthread.php?t=7462
 
#10 ·
thedude said:
i dont get it, why would you want to turn off vsc
Coming from an off road racing background and being used to steering with my right foot i love this mod!! its fun to powerslide across a drylake at mach 2 with your hair on fire!!

Way to go, major props for this mod.
 
#11 · (Edited)
N7VDR said:
why would you use a differnt color wire? all your doing is interupting a circut with a switch, extending the circut into the cab same wire same color.
I was about to say the same. It's not a pos/neg deal.

If I had a complaint it would be that the wires need to be concealed, it looks a lil bit rigged.

Good job though. I love watching the progression of these mod ideas from concept to reality.

thedude said:
i dont get it, why would you want to turn off vsc
It's been thoroughly discussed, beaten to death, buried, dug up and beaten to death again, and discussed some more in the thread Osprey referenced... here.
 
#13 · (Edited)
Ridge111 said:
If I had a complaint it would be that the wires need to be concealed, it looks a lil bit rigged.
I tried to wrap electrical tape around the wiring harness but large sections are attached to the body making it nearly impossible. I thought about opening it up and actually running the wiring through there but decided against it for obvious reasons.
 
#14 ·
FJCruiserSpecialist said:
Coming from an off road racing background and being used to steering with my right foot i love this mod!! its fun to powerslide across a drylake at mach 2 with your hair on fire!!

Way to go, major props for this mod.
Thanks! (It really is fun. :devil: )
 
#15 ·
So when you flip the switch you installed the VSC turns off, but you get all those error lights.

I noticed that when you put the FJ in 4-wheel high, the VSC turns off on it's own. Is there a way to trick the the VCS into thinking the 4-Wheel high is engaged so it will shut itself off, but you wouldn't get the additional error codes?
~C
 
#18 ·
Cruzer said:
So when you flip the switch you installed the VSC turns off, but you get all those error lights.

I noticed that when you put the FJ in 4-wheel high, the VSC turns off on it's own. Is there a way to trick the the VCS into thinking the 4-Wheel high is engaged so it will shut itself off, but you wouldn't get the additional error codes?
~C
I really wouldn't call them error lights only indication lights that it is off. Much like the 4WD or locked diff lights...
 
#153 ·
I do all the time. My bro-in-law bet me i couldnt light up all 4 tires.:rocker:
 
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#22 ·
Unfortunately it appears that VSC (and related) are government mandated safety features that will be required by 2009 (or so) to help reduce roll over deaths and injuries. I would be fearfull that installing a cutoff for the VSC could engender substantial liability in the event of an accident. And no I am not a lawyer.
 
#23 ·
I would second the last statement. If you have a mod to your can and it CAUSES a wreck I suspect that you would be liable. However, the black box records the status of the car at the time of impact and it seems to me that it would capture the VCS status which should prove that it was not disabled during highway driving.

My main concern with cutting into the factory harness is possible rejection of a warranty claim. Also, I really do not want to smoke a computer $$$$$$.

Tomas
 
#24 · (Edited)
I'm speaking from my knowledge in computer programming. I would not think they would be able to record that YOU DISABLED VSC by the ways of wiring hack, but rather shows that VSC was not in effect.

If they had VSC Disable Button as standard option in all FJ, then they would have written extra lines of codes in that you DISABLED VSC. Being that the button is not standard option, I'm pretty sure codes were not written in.

If you could put everything back the way it was after the accident, then you may be able to cover everything up. Then technician who analyze the recordings will say that ECU have a failure to trigger VSC.

To come to think of it. Minor accidents would not warrant a reason to look into your blackbox. Only when in serious accident. Chances are you will not be able to access your FJ to cover up your hack when it was involved in serious accident. Typically your vehicle will be in hands of accident investigators.
 
#29 ·
well, in regards to vsc turning off in 4hi: b-s. mine shows off in 4hi, but still locks brakes in rear in really low traction situations, unless i floor it. yota dealer says its ok and normal, i say it sucks. if i get a wheel oup like major flex, i cant just keep moving, i have to use 4lo w/locker, or practically floor it.
 
#30 ·
CRUZER said:

"I noticed that when you put the FJ in 4-wheel high, the VSC turns off on it's own. Is there a way to trick the the VCS into thinking the 4-Wheel high is engaged so it will shut itself off, but you wouldn't get the additional error codes?
~C"

I have found the VSC system to be annoying at best and in one case it created a hazzard when I was trying to merge onto the freeway and there was a pothole in the on-ramp and as the tires hit the hole while accelerating to merge the VSC kicked in and cut the power to the engine at about the same time I was entering traffic. The cars on the freeway had to abruptly slow down to avoid running into the back of my FJ. Neither they nor me were very happy. The system kicked in unnecessarily about a dozen times this week with the roads being patchy snow covered.

Take a look at the attached PDC on page BC-42, the 12th line down labeled "EXI". This is the input to the skid control ECU from the transfer case telling the ECU that 4-wheel drive is engaged (AT) or that HH or HL is selected (MT). I have the AT so I'm not too familiar with the MT. It shows that when in 4wd the terminal receives 12 volts and when in 2wd it receives no voltage. I think that if 12 volts is constantly applied to the terminal, the ECU will think that you are always in 4wd and turn off the VSC. This should work much the same way that the "Alex ATRAC Hack" fools the ECU into thinking that the rear diff isn't locked, allowing the use of both.

The teminal is number 27 on the large ECU connecter and according to the chart, is a grey wire. To test if this works, you could connect a jumper wire from pin 27 to pin 46 (IG1 which is powered when the ignition switch is on). You should be able to fool the ECU into thinking 4wd is engaged. If this works, I will be looking for a switch to turn the VSC off when I want. I wonder if the 4Runner or Sequoia have a VSC-off switch that might work.
 

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