Not sure if this is relatable to this thread but If I'm trying to disable KDSS completely is there a fuse or relay I need to pull to get rid of the KDSS light on the dash once I remove everything?
GX470 KDSS bypass (3 Viewers)
- Thread starter Jstawgn
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- Thread starter
- #22
Unplugging the controller in left side quarter panel would disable this.
Also running high speed gravel road need KDSS in soft mode. With the KDSS in stiff mode it really reduce traction and makes the vehicle really squirrelly.
- Thread starter
- #23
Stumble on this video. Although I did not agree on the his point the the bypass are not necessary, it explain conditions when the solenois is activated very well.
This is the Tinkerers adventure KDSS video reference in above video.
I my personal experience, KDSS is bad when the solenoid activated on gravel / loose surface and you need to corner quickly. I volunteer as heavy sweep for American Rally Associations and normally rally stages are gravel. With KDSS on it feels really skittish around corner as the suspension become too stiff and try to load outside tire too much while lifting inside tires. Rally cars don't have stiff swaybar for the same reason.
Based on my experience I would even disable KDSS while driving on snow.
This is the Tinkerers adventure KDSS video reference in above video.
I my personal experience, KDSS is bad when the solenoid activated on gravel / loose surface and you need to corner quickly. I volunteer as heavy sweep for American Rally Associations and normally rally stages are gravel. With KDSS on it feels really skittish around corner as the suspension become too stiff and try to load outside tire too much while lifting inside tires. Rally cars don't have stiff swaybar for the same reason.
Based on my experience I would even disable KDSS while driving on snow.
That's a great video and has me really questioning my butt dyno. I am curious if the systems are exactly the same between the 470 and 460? I have not seen the diagram referenced in both video for the 470 specifically - have you?
If my drive around my neighborhood where I thought the little imperfections in the road disappeared was a placebo, I'll accept that. However, I refuse to believe that my test drive down the tank trail was as well. Even the sounds inside of the cab were different - the usual rattles and clanks were gone. At 25mph (KDSS enabled) I honestly felt like my GX was going to rattle and shake apart. At nearly DOUBLE that speed (between 45 and 50mph) the rattles and clanks I have become accustomed to were virtually non-existent and I felt perfectly fine... If that was a placebo... Man. I need to start pushing the hallucinogens harder to see what the heck I can unlock up there.
Assuming the systems are identical: I wonder if "steering speed" (something I know nothing about) or lateral acceleration rate were coming into play with my test. I would not be surprised to find out that were the case. In the first run (KDSS on) I was definitely bumping side to side quite a bit, and had I taken my hands off of the wheel it surely would have been moving left to right at a high rate of speed.
Honestly, I am mostly curious about the KDSS "rules" of the 470. I would not be at all surprised if our system is slightly different or less intelligent. ie locked to speed only vs. the multiple variables of the 460.
If my drive around my neighborhood where I thought the little imperfections in the road disappeared was a placebo, I'll accept that. However, I refuse to believe that my test drive down the tank trail was as well. Even the sounds inside of the cab were different - the usual rattles and clanks were gone. At 25mph (KDSS enabled) I honestly felt like my GX was going to rattle and shake apart. At nearly DOUBLE that speed (between 45 and 50mph) the rattles and clanks I have become accustomed to were virtually non-existent and I felt perfectly fine... If that was a placebo... Man. I need to start pushing the hallucinogens harder to see what the heck I can unlock up there.
Assuming the systems are identical: I wonder if "steering speed" (something I know nothing about) or lateral acceleration rate were coming into play with my test. I would not be surprised to find out that were the case. In the first run (KDSS on) I was definitely bumping side to side quite a bit, and had I taken my hands off of the wheel it surely would have been moving left to right at a high rate of speed.
Honestly, I am mostly curious about the KDSS "rules" of the 470. I would not be at all surprised if our system is slightly different or less intelligent. ie locked to speed only vs. the multiple variables of the 460.
Found the exact diagram in the manual for a 2005 GX.
Has me thinking...
Has me thinking...
- How does lifting the suspension impact sensors for activation?
- How does running larger tires impact sensors for activation?
- How does raising or lowering the roll center impact sensors for activation?
- Thread starter
- #26
That is exactly the same diagram shown in his video.
Steering input higher than 5°/sec and speed above 12 MPH would close the solenoid.
Second conditions are:
- lateral G higher than 0.4G above 2 MPH
- lateral G higher than 0.2G above 12 MPH
I would assume the lateral G can pretty bad below 12 MPH on rough terrain to cause KDSD solenoid to close.
I could definitely feel it is advantageous to bypass KDSS at higher speed gravel road. There is a reason rally cars and desert runner does not use thick swaybar.
Steering input higher than 5°/sec and speed above 12 MPH would close the solenoid.
Second conditions are:
- lateral G higher than 0.4G above 2 MPH
- lateral G higher than 0.2G above 12 MPH
I would assume the lateral G can pretty bad below 12 MPH on rough terrain to cause KDSD solenoid to close.
I could definitely feel it is advantageous to bypass KDSS at higher speed gravel road. There is a reason rally cars and desert runner does not use thick swaybar.
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Hey all, sort of off topic but not... So does unplugging at the rear basically turn off KDSS? Can one just unplug it on a case by case basis? Maybe know you're going to be on gravel for a few days or the roads are slow and very rough (Chicago)?
I'd kinda like to do this now, but with a toyota style switch. Can it be done as a toggle? Or do I need a momentary?
- Thread starter
- #29
Yes, absolutely. Any connector disconnected would disable KDSS.
Yes you can. You can just cut one of the solenoid wire and insert a manual switch and it would do the same thing. The current draw of the solenoid are pretty low.
I would not touch the pressure sensor wire. It's analog and adding switch would change the reading.
I used a Toyota style momentary switch that just says “KDSS” on it. No need to use a toggle.
I was thinking the on/off switch would give me a visual indicator of what the setting was. Or does the dash light come on with this?
- Thread starter
- #32
KDSS Dash light would come on. It would trigger a fault from detecting the open connection. It would automatically reset once the condition reset but the fault would stay in memory if you use some advanced code reader.
Cool, thanks for the patience answering my questions.
I don’t have everything done, but I did use these instructions to get the relay wired and installed, and tested with a ch4x4 switch, so thanks for putting this out there. Should be able to get the wiring complete tomorrow.
Digging up this thread with a question.
What’s the advantage of using a relay + momentary switch instead of a toggle switch without a relay?
Is the concern with a toggle that you’d have all that wire running from the switch back to the KDSS harness in the back?
What’s the advantage of using a relay + momentary switch instead of a toggle switch without a relay?
Is the concern with a toggle that you’d have all that wire running from the switch back to the KDSS harness in the back?
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- Thread starter
- #36
The intention is to have it automatically reset when you start the car. A switch works too and you only need to interrupt one solenoid. I did both upper and lower chamber solenoid and found out later it was not needed. One would throw a fault and disable the system already.
Thanks a ton for the quick reply!
One follow-up question about how the momentary switch + relay allows the system to automatically reset when the car is started.
This is probably my lack of understanding of relays.
When the momentary switch is pressed, my understanding is the connection between NC1 - C1 flips to C1 - NO1 (same for NC2 - C2). If the switch is pressed again, flips again.
When the car is turned off then started, what is it that resets the relay to the normally closed connection?
One follow-up question about how the momentary switch + relay allows the system to automatically reset when the car is started.
This is probably my lack of understanding of relays.
When the momentary switch is pressed, my understanding is the connection between NC1 - C1 flips to C1 - NO1 (same for NC2 - C2). If the switch is pressed again, flips again.
When the car is turned off then started, what is it that resets the relay to the normally closed connection?
- Thread starter
- #38
This relay memorized the last state it was. Push the button again and it revert to original state. I did not realize this when I order it.
It can be configured to a few different way. I haven't mess wirh it to find out if there is a better way.
Got it - thank you!
