How or when does KDSS kick in?

DesertCanyons

New member
I test drove a 2015 T4R TE Premium with KDSS today. It drove real nice at freeway speeds and around town at 35 to 40 mph. Cornered well and had a good stiff ride on bumps and turns. No body roll, as advertised.

So I pulled over to put it in 4 wheel low and try to set all the A-Trac, Hill assist and most importantly, the KDSS. I didn't set the A-Trac, etc. but I could not find a control for the KDSS. We sat there reading the manuals for a couple of minutes. I had the Quick Start short manual. We didn't find anything on setting the KDSS.

So I have to wonder if KDSS engages automatically and releases the wheels for long travel at slow speeds. I had the truck in 4WL and drove one side up a driveway and onto a curb and then down over the curb. At 2 to 3 miles per hour all 4 tires stayed on the ground, but maybe that curb wasn't enough to really over-extend the axles and test large articulation of the wheels/tires.

Any tips? Did I miss finding the KDSS switch? Does it release the sway bars automatically at slow speeds? :thanks:

BTW, I'm not going to buy this truck. It's black, which I don't want in sunny So Cal. It's the Premium with a sunroof I can't open because I'm too fair to sit in the sun. It has a sliding cargo tray I don't want ($350), a cargo cover I couldn't close with one hand ($155), NAV I don't need, Leather-like upholstery that is very nice but not for the Premium price. The sticker price is around $42,500. So if this is what you want call or go to Toyota of Pasadena and ask for David James. He's a good guy and capable of making the deal for you.

I've seen the sticker price on several T4R TE with KDSS and without a lot off accessories at around $39,000. That's what I'm looking for.
 
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I had the truck in 4WL and drove one side up a driveway and onto a curb and then down over the curb.

Why are you driving in 4WD on cement?

I don't have a 5th gen. Is this something that 5th gen-ers do?

It is a mortal sin in most 4WD trucks to drive on pavement in 4LO.
 
Great work, community. You guys really provided some useful guidance for this guy, and you should all be proud. Especially the 3rd gen guy who felt the need to chime in and chastise the OP because cars 'splode when you put them in 4wd for a minute on a test drive on pavement.

The KDSS system is automatically active below a certain speed (12mph I believe). This does indeed make it tough to test and see the benefit. But like you mentioned, you can find a ditch or something to nose the car in to at an angle.

Good luck in your search!

Dan
 
Great work, community. You guys really provided some useful guidance for this guy, and you should all be proud.

The KDSS system is automatically active below a certain speed (12mph I believe).

Wrong. Useful guidance, you should be proud.


It's a completely passive system, constantly active. When one wheel goes up enough, and the other goes down enough as determined by the hydraulic sensors, the system simply "disengages" the sway bar. You have no control over it other than deciding where to drive. It is speed sensitive. According to the service manual, the KDSS system is tied into the vehicle speed sensor, wheel speed sensors, steering position sensor.

https://www.youtube.com/watch?v=NLF6n3nMwww&feature=youtube_gdata_player
[MENTION=115572]DesertCanyons[/MENTION] this ^ helps alot. Check it out.
 
Last edited:
wrong. Useful guidance, you should be proud.


It's a completely passive system, constantly active. When one wheel goes up enough, and the other goes down enough as determined by the hydraulic sensors, the system simply "disengages" the sway bar. You have no control over it other than deciding where to drive. It is speed sensitive. According to the service manual, the kdss system is tied into the vehicle speed sensor, wheel speed sensors, steering position sensor.

https://www.youtube.com/watch?v=nlf6n3nmwww&feature=youtube_gdata_player
[mention=115572]desertcanyons[/mention] this ^ helps alot. Check it out.

you mean kdss is not active all the time?

lol.....
 
Why are you driving in 4WD on cement?

I don't have a 5th gen. Is this something that 5th gen-ers do?

It is a mortal sin in most 4WD trucks to drive on pavement in 4LO.

It's okay to drive it in a straight line for a periodic function test.

Also, wet boat ramp.
 
Thanks for all the help and feedback

Great work, community. You guys really provided some useful guidance for this guy, and you should all be proud. Especially the 3rd gen guy who felt the need to chime in and chastise the OP because cars 'splode when you put them in 4wd for a minute on a test drive on pavement.

The KDSS system is automatically active below a certain speed (12mph I believe). This does indeed make it tough to test and see the benefit. But like you mentioned, you can find a ditch or something to nose the car in to at an angle.

Good luck in your search!

Dan

Thanks to Dan for noticing I was asking a basic newbie question and for providing a good answer. I know you're out there somewhere driving down a country road.
Thanks to GabrielM, ST8Rocks, Sandcrawler, and Badhabits for the links and info. I have seen most of the videos on you tube and from Toyota on KDSS. None of them explained how a person can engage it, hence my newbie question.

Thanks for all the useless responses too. Yes, I drove a T4R TEP on pavement in 4Lo at 2 mph. So shoot me. :gun6: I played with it at a dead stop to see how the transfer case link operates, to confirm it has 2hi for efficiency as a daily commuter car, and to see how the KDSS engages and operates. I found a park with a driveway leading to a sidewalk where I could get one wheel and/or one side up and over the only obstacle I could find in a short test drive in the city, a curb.

I had no intention of buying the car, for all the reasons I stated in my OP. The sales guy, David James, was hoping I'd buy the car anyway. It was his idea to go for a ride after I told him it had too many options I didn't want and cost too much. I thought, okay, I've never driven a T4R with KDSS. I'll give it a try.

David is a good salesman with an interesting background. He grew up on an island in the Caribbean. I've travelled around the Caribbean so it's always good talking to him. He calls me about once a month, when they have an interesting TRD Pro or Trail Edition on the dealership lot. If you're in So Cal and you want this black T4R TEP go see him.
 

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