hoser
SILVER Star
I "think" when CDL is engaged, the ABS also takes a different ABS program. Not 100% sure though.
"VSC" Caused me to total my LC-100
- Thread starter Alaskan_IB
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if the vsc was disabled and not the CDL locked, you'd see the vsc off light, but you wouldnt see the locker engaged light. no need to a lighted rocker.
In the method I recomended you would be disabling the VSC by making the ECU "think" that the CDL is locked. Thus the ECU would turn on those lights even if it wasn't actually locked. The switch I suggested to parallel appears to only be a sensor so it's kind of like a false positive, since the actuation of the CDL is handled elsewhere in the system.
oh ok.
scottm
SILVER Star
Here's the way a guy did it on his '07 4Runner:
VSC Off, ATRAC On Mod complete! - Toyota - 4Runner . org Forum
VSC Off, ATRAC On Mod complete! - Toyota - 4Runner . org Forum
Well that was a short lived wait to see if my suggestion would work.
Since the 4Runner guys are bypassing the same switch it should work identically on our trucks. OK, except that we won't have the 2wd problem... it should just work on our trucks
Since the 4Runner guys are bypassing the same switch it should work identically on our trucks. OK, except that we won't have the 2wd problem... it should just work on our trucks
ToyotaDon
I am here
After looking at the EWD, I'm thinking there's a different way to do this on the Land Cruiser.
Can you guys tell me if the VSC also turns off when you shift to 4LO?
It seems like you should be using the 4LO signal wire that goes to the VSC Control Module. This is a Black wire with a Blue tracer on pin 8 of connector A43. You would use a 2-pole switch or relay to disconnect the VSC Control Module from the other Control Modules, and provide 12V on that wire.
I believe this would disable VSC but allow everything else to function properly. All anyone can do is try.
Can you guys tell me if the VSC also turns off when you shift to 4LO?
It seems like you should be using the 4LO signal wire that goes to the VSC Control Module. This is a Black wire with a Blue tracer on pin 8 of connector A43. You would use a 2-pole switch or relay to disconnect the VSC Control Module from the other Control Modules, and provide 12V on that wire.
I believe this would disable VSC but allow everything else to function properly. All anyone can do is try.
everything stays on here, and the CDL doesnt engage on 4LO.
That would be the perfect solution, except that it would work on nobody's car. The 98's and 99's automatically lock the CDL in 4L, but they don't have any vsc, and thus no need to do this (and also no vsc control module). The 2000's and on had the option of turning the CDL off in 4L, so it wouldn't work for them either.
ToyotaDon
I am here
Thanks for the info.
After more research it seems you guys are on the right track. The only thing I would recommend would be instead of grounding that wire, just disconnect it (via a switch) at the VSC Module. When the VSC Module sees 0 Volts on that wire, it assumes the CDL Detection Switch is closed, which would normally turn on the CDL light. The VSC will be disabled, but the CDL light will not turn on.
The simplest solution (though cutting of a wire is involved) would be a switch that disconnects the VSC Module from the CDL detection circuit.
Now for the pictures:
These show which pin I am talking about, you can decide what type of switch would work for each application.
Here is a pic of the switch of out of all the 98-0? Lexus GS sedans. This switch is on the panel between the driver/passenger.
If there is interest, I could pull this switch over the weekend and take a pic of the back.
If there is interest, I could pull this switch over the weekend and take a pic of the back.
If the VSC system changed between 98-2000 and 2000-on in the gs's, the wiring may have changed. Only the 2000-on cruisers had VSC, which would correspond with the 2000 and later gs's. If anybody has a 2000 and later GS they'd be willing to tinker with, that may be of more relevance.
Never read that in a official doc, but I'm pretty sure it does !
We had yesterday our first snow storm...roads were slipy because snow did not stuck to macadam
In town, I was unable to break correctly and decently... ABS always handles on and the breaking distance was, of course, unacceptable.
After few scarry breaking, I put CDL on, and everythings became allright... I was the boss on board and able to break as I wanted.
I tried once to break heavily, and ABS did its job,,, so not disengaged totally
The switch I could pull is from a 2001 GS300... the pic above (from a 1998 GS) was the only good pic I could find of the switch (it does look identical in the 2001, though)
ToyotaDon
I am here
The problem with that switch is that it's a momentary switch, it doesn't click on and off. When you press it, a ground signal is sent to the VSC Module which cancels VSC operation until the switch is pressed again or the ignition is cycled. That way, it can't be turned off and left off, but will come on again when you start the car. The switch you guys need would be one that would stay on or stay off.
Now that I think about it, there would be a way to make that switch work, but it would require a certain type of relay, one that would stay actuated after receiving a momentary ground signal. These relays are not common, I think it would be better to just use an on/off switch.
If I had a 100 series, I'd do this and a subsequent write up. Unfortunately, the only Cruisers I have available to work on are virtual.
scottm
SILVER Star
You should be able to make a latching circuit with a typical relay, and when you cycle the power the relay would be open again so your spouse/kid/car thief will be protected by VSC. At least that's my plan for my 4R, that switch would be perfect.
Don, You are right on the money! I personally wouldn't mind a switch that would cycle, when the ignition is turned off. I can see why some wouldn't want it. I told my 
this week that if the roads are questionable, push the magic button!
....and you NEED a 100 series... all this knowledge and no truck? It just isn't right!
this week that if the roads are questionable, push the magic button!....and you NEED a 100 series... all this knowledge and no truck? It just isn't right!
Don, You are right on the money! I personally wouldn't mind a switch that would cycle, when the ignition is turned off. I can see why some wouldn't want it. I told my
....and you NEED a 100 series... all this knowledge and no truck? It just isn't right!
Actually, a momentary switch would probably be ideal, as you would trigger some nasty codes if you forgot to disengage the VSC cut during startup diagnostics. You would most likely get the VSC-ABS-TC error as you turned the ignition on. A momentary switch would allow the car to complete the diagnostics completely, then let you turn off VSC afterwards.
I don't think this matters for the particular switch in question. If the CDL is left locked it stays locked and the indicator switch at the t-case would continue to indicate that the CDL is locked... no problems with diagnostics. So a constant bypass switch would send the same signal and thus should have no problems with start up diagnostics.
So the momentary switch is a convenience thing... I like the idea, I just don't see it as necessary.
The switch we were discussing would send a ground to the VSC controller, because we were trying to splice a GS controller into our cars. Since there was (im assuming) no factory wiring for a VSC cut swtitch, you would have to ground a certain wire with the switch. If you hooked in a permanent switch, you would not pass the startup diagnostic if you forgot to turn it off. The problem with splicing the CDL wire is that you would also change the ABS function as well as the VSC, and the OP just wanted to disable VSC while maintaining all other functions.
