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Join Date: Jan 2007
Location: Seattle, WA
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Your HL is FWD or primarily so, downshifting a FWD or F/awd(***) vehicle to use engine compression braking can/will often result in loss of control, almost INSTANT loss of control. The very best way to slow an automatic transmission vehicle, RWD or FWD, on a steep slippery downhill drive is to first shift the transaxle into neutral and then apply the rear implemented e-brake ever so lightly, very judiously. If you expect to encounter this situation fairly often I would even suggest disabling the e-brake latching mechanism.
*** The only vehicles with sideways mounted engines that deserves the F/AWD term (vs F/awd) are those equipped with the Honda/Acura SH-AWD system.
DAC is a variation on the ABS/VSC feature and uses the brakes not the engine to maintain control
The Downhill Assist Control generates four-wheel hydraulic pressure
when the downhill assist control switch is pressed and the accelerator and
brake pedals are not depressed in order to maintain a constant low vehicle
speed without causing the wheels to lock.
Agree before VSC and all of the other computer stuff the best way was to shift into neutral.
Learned that when I had a Jeep Grand Cherokee with full time four wheel drive.
I hit an icy spot going around a curve and I was doing donuts until I put it in neutral.
All of the wheels were turning at there own pace and around and around I went.
The computer stuff now days brakes each wheel based on the VSC logic.
The yaw and wheel sensors and VSC computer where not in our cars of old
2008 Highlander Limited AWD, Silver, SmartKey, VSC/TRAK, Bluetooth, Remote Start, No Nav, Tow package/hitch/color matched fascia, roof rack cross rails, Color keyed mud guards, Camry trumpet horns
Last edited by summerwind; 01-27-2009 at 04:42 PM.