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Old 07-16-2006, 12:47 PM #1
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Does downhill assist really do this?

I found this over on the RV.net forum. I had never heard of this - is it true?

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The 4Runner on the other hand comes with a 5 speed automatic with Downhill Assist control that when engaged acts like the tow/haul mode on the Allison transmission on GM HD trucks. It will downshift a gear everytime you brake to allow grade braking so you don't fry the brakes. And you can also shift the lever to any gear you want, there's D, 4, 3, 2, L which helps a ton when coming down steep grades with and without the trailer.
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Old 07-16-2006, 12:49 PM #2
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Not exactly.

I played with mine a few times, and it seems to basically crawl down a slope. You might be able to manually select the gear though..... I don't really remember.
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Old 07-16-2006, 01:15 PM #3
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I've used it while offroading, but the quote sounded like you could use it as an engine brake while traveling highway speeds.
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Old 07-16-2006, 03:07 PM #4
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doesn't the book say that it only works in low range under 15mph. I've yet to get mine to work.
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Old 07-16-2006, 03:13 PM #5
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Quote:
Originally posted by mainer
doesn't the book say that it only works in low range under 15mph. I've yet to get mine to work.
Why doesn't it work? You just have to enable it under the right circumstances.
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Old 07-16-2006, 03:14 PM #6
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Re: Does downhill assist really do this?

Quote:
Originally posted by TeryT
I found this over on the RV.net forum. I had never heard of this - is it true?
He's just using the wrong term. DAC works only in low range. He must be referring to the shift into 4th from 5th when touching the brake downhill in high range.
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Last edited by JB.; 07-17-2006 at 02:20 AM.
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Old 07-16-2006, 03:19 PM #7
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Quote:
Originally posted by mainer
doesn't the book say that it only works in low range under 15mph. I've yet to get mine to work.
Low range, foot off the pedals, 15mph or less...it should work.
It'll temporarily disengage under pedal use and then come on again
when you take your foot off.
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Old 07-16-2006, 03:30 PM #8
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Quote:
Originally posted by Fourty-four
Why doesn't it work? You just have to enable it under the right circumstances.
That must be it! I thought I was missing something when towing, going downhill & manually downshifting.

Didn't want to be caught doing the "old school" way if there was a new one!

As said, I have used the downhill assist offroading (in 4-low), and it works well - you just have to get used to it doing the job (and the noise it makes).
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Old 07-16-2006, 03:36 PM #9
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I tried it on a long down hill covered in snow. I was under 15 and had my foot off brake and gas. low range and hit the button, it did nothing. I'll have to try it again.

Doesn't the trany down shift when you apply the brake?

and is the trany in the sport a 4 or a 5 speed.

Thanks Cooper
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Old 07-16-2006, 05:26 PM #10
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Re: Re: Does downhill assist really do this?

The 4Runner does not have anything like tow/haul mode.

They need to read up on Downhill Assist.
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Old 07-16-2006, 06:53 PM #11
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Somebody else said: "This is what the Tundra has (not restricted to 4-low)- I'd assumed they'd just passed it over to the 4-runner. There is no engaging or disengaging it however. Simply, when you are on a downgrade with the brakes applied, the Tundra will down shift. "
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Old 07-16-2006, 06:57 PM #12
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The person that made the post over on RV.net replied and said:

Quote:
It works in 4hi for me, I just tried it today. I was coming down a steep grade and turned on DAC, tapped the brakes and the tranny downshifted a gear and increased RPM's which slowed down the truck. I don't know if that is a feature in the 05 and up models or if its in all of them. In 4Lo the DAC uses the ABS system to keep the 4Runner pointed in the direction you want down a steep hill under 15mph. The DAC works very well when towing.
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Old 07-16-2006, 07:09 PM #13
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Quote:
Originally posted by mainer
I tried it on a long down hill covered in snow. I was under 15 and had my foot off brake and gas. low range and hit the button, it did nothing. I'll have to try it again.
Make sure you don't have your foot on either the brake or the gas when you acivate DAC. Reading through the manual it sounds like pressing either one will deactivate the system.

I've used mine a couple of times and have to say it's kind of creepy at first, plus it makes a bunch of noise as it activates and releases the brakes. Sounds like something must be getting ready to come loose under the truck.
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Old 07-16-2006, 07:27 PM #14
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Quote:
Originally posted by TeryT
The person that made the post over on RV.net replied and said:
It works in 4hi for me...turned on DAC...tapped the brakes and the tranny downshifted a gear



That would have happened whether he pushed the DAC button or not.
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Old 07-17-2006, 01:40 AM #15
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Quote:
Originally posted by JB.
It works in 4hi for me...turned on DAC...tapped the brakes and the tranny downshifted a gear



That would have happened whether he pushed the DAC button or not.
Exactly.....totally seperate features.
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