Normal....I think?
- Thread starter MadH8R
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4runner10
New member
Never had this on my SR5. It will roll back on a hill like any other car, but I've never had the traction control system freak out. I wonder if it could it be an issue with calibration? Would be interesting to get a Toyota tech opinion on it.
Occasionally the traction will become active during turns or something when it shouldn't, but I guess that's the nature of the beast.
Occasionally the traction will become active during turns or something when it shouldn't, but I guess that's the nature of the beast.
It's hill start assist:
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Okki
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Okki
1engineer
Moderator
Apparently you never had it on a hill then. My 2011 SR5 did this as does my 2012 TE.
4runner10
New member
Uh, I've had it on tons of hills. I don't live in the rockies or anything, but certainly not the prairies! I've been on dirt hills, gravel hills, paved hills, never had it happen. Maybe my truck is the one with the issue LOL!!
BigredTEX mentioned it happens when you are rolling backwards and shift into drive. I don't really ever do this because it's not good for the tranny, is that when it's happening?
1engineer, are you suggesting it does it every time you start from a red light on a hill?? That seems odd to me, and I don't think Toyota would make customers live with such an annoyance.
westwind77
New member
:ybrick: HAC people arg. :rtfm:
If you every so lightly apply the brakes up a hill then gently release them the 4R can roll back without activating this system. However, I am man, I press hard, systems works as should, (grunt grunt grunt).
All kidding aside all 5th gens have this and the TRAC & HAC are 2 different systems/features.
(sorry for the crankiness, 2hrs to get little one to sleep)
If you every so lightly apply the brakes up a hill then gently release them the 4R can roll back without activating this system. However, I am man, I press hard, systems works as should, (grunt grunt grunt).
All kidding aside all 5th gens have this and the TRAC & HAC are 2 different systems/features.
(sorry for the crankiness, 2hrs to get little one to sleep)
1engineer
Moderator
If you are on a hiil in Drive and you start to roll backwards without hitting the brake it will chatter. If you hit the brake with a little force it wil hold with no chatter. That's all lol.
cbreze
Member
So is the HAC button on by default then? Pressing it turns it off? Or do I have it backwards? I tried pressing it once and nothing lit up on the dash to indicate it was disabled. When on hills I always have the break pedal pressed, guess I'm old school and this is my normal reaction to being stopped on hills.
Jeremy556
New member
You don't live on hills if you have not experienced HAC, sorry. When in any forward gear, when you release the brake, if you roll backward, the electronics will stop you and make a beeping sound.
harper7
Senior Member
It's on by default and there is no such thing as a HAC button. There is a DAC button for steep downhill and you have to be in low. It's all explained in the owner's manual BTW.
Here's DAC.....2010 Toyota 4Runner: Downhill Assist Control (DAC) - YouTube
and here's HAC.....2010 Toyota 4Runner: Hill Start Assist Control (HAC) - YouTube
cbreze
Member
Thanks Harper, got my DAC and HAC mixed up. I have a very steep driveway, next time I come up I'll test it.
tamerunner
New member
Same here. normal
wvbeachguy
New member
Normal, my 11 SR5 did it and my 12 TE does it.
cbreze
Member
I tested this out today for the first time and don't really see the point. I never could get it to hold even after mashing hard down on the brake pedal. It would clatter then slip back then clatter some more and slip back. if anyone was behind me I'd of hit them. it seems to me just applying the brakes normally works much better. i could see if one had a clutch to deal with then maybe , but with an auto tranny? Not so much. When would this be useful? Wheeling? I wonder how much extra I paid to have this option? I've been four wheeling since the seventies and don't think I ever would have needed this.
4runner10
New member
That's true, I live on a level lot. However, I have stopped at many red lights on hills (usually paved) and when I transition from brake to gas it will roll a bit with no HAC intervention. Perhaps if I delayed my transition from brake to gas it would intervene.
I am going to find a steep hill and try taking my foot off the brake and rolling and see what happens. If you look at the video posted about the HAC system however, it doesn't show any rolling back. I guess they wanted to make it look better than it really is!
1engineer
Moderator
That's true, I live on a level lot. However, I have stopped at many red lights on hills (usually paved) and when I transition from brake to gas it will roll a bit with no HAC intervention. Perhaps if I delayed my transition from brake to gas it would intervene.
I am going to find a steep hill and try taking my foot off the brake and rolling and see what happens. If you look at the video posted about the HAC system however, it doesn't show any rolling back. I guess they wanted to make it look better than it really is!
It won't roll back any if you press the brake firmly before removing your foot.
Here is what I know:
1. If you are going up a hill and coast to a stop without hitting the brake it will roll back and make noises.
2. If you come to a stop on a hill and hold normal brake pressure, just enough to hold, and you remove your foot from the brake it will make a noise and roll.
3. If you do the same as above and press firmly on the brake and then release it won't roll back and minimal noise.
The above only works in drive, not reverse or neutral.