Cruise control issues!

If you are a long-time cruise control user, you might discover that this cruise control operates a little differently than most with regard to using the accelerator pedal while engaging the cruise. Using "legacy" cruise controls, I would typically hold the accelerator to maintain the desired speed, engage the cruise, then release the pedal. This led to a very smooth engagement.

However, because of the electronic throttle, if the accelerator is not fully released, the cruise control thinks you are trying to override it and will not engage until you fully release the pedal. The car will actually slow down if you are not giving it enough gas to maintain speed. Release the pedal and the cruise will take over.

Try this and see if it helps. If not, you might have a defective unit but I would guess it's an "operator training error."

 

It is a bit odd, but pressing the activate button, then set speed, then press the lever down to set CC. I kept touching the windsheild wiper arm at first. Took a bit to get used to.

 

Can you elaborate a little bit more on the exact steps you're doing them and in what order? I haven't had any issues with an intermittent cruise on the Prius, although I did on a previous car.

As long as you aren't toggling the cruise on/off or shutting down the car between trying to "resume" (i assume that's what you're trying to do), then it sounds like it may be an issue with it. Setting cruise and braking or pulling the stalk to cancel and setting again at any speed shouldn't be a problem.

 

Cruise control doesn't work when the regen brake is active

 

90% of the time I am driving I am using cruise control. I have 80,000 miles and have never had it not work. Your unit might be defective somehow. Here is how I use it.

When I start the car I turn it on. When I get to the desired speed I tap down to set. When I see I need to slow down I either tap or hold down and this will slow down the car. I use the gas pedal to get back up to speed because when you tap or hold up it is too aggressive and waste gas.

Another trick is if you are going less then 40MPG it is better to set cruise at 2 MPH higher then back off by tapping down. This will force the car to run on electricity.

I hate when people post stuff like this. First there is no way to make it active or not active. Regenerative breaking is always on. If the bar is below this area the car is generating energy.



While cruise control is on it uses regenerative braking all the time. Especially when going downhill.

 

I think you mean B mode, not regen brake.

Tom

 

I think he meant ren braking. I could not imagine anyone wanting to turn cruise control on while using then engine brake (B Mode).

 

I use "B" mode quite often and sometimes I forget it's still in "B" mode and the cruise control will not work in my car. Simply shifting back to "D" allows it to work.

I use "B" mode to slow the car without using the brakes, that's what it was meant to do, not for re-gen.

 

No one ever claimed it was for regenerative braking. Its purpose is to use the combustible engine to slow the car down when going down a long steep hill.

If you are going down a long steep hill you should be using regenerative braking. There will be a point where the battery is full or there is too much heat at the motors generating energy. This is when you have the choice of wearing down brake pad or using B Mode to use the combustible engine to slow the car.

The OP is having flaky results using cruise control. I doubt very much that the OP is going down a steep hill for a long time and putting the car in B Mode when having the issue. Ursle posted this.

I just wanted to make it clear that regen braking does fully function with cruise control.

 

It's meant to throw away energy. If what you are after is slowing without the brakes, just push the brake pedal. It will use regenerative braking, up to the limit of regen.

Tom

 

Yep! Got my 2012 Prius last Thursday. Cruise works but won't resume. Dealer gets in back this friday.

 

What speed are you at when you attempt to resume? You're shifted into D mode and not B, correct?

 

I have the same problem. how did it get resolved? My dealer has had the car twice. Can't find the problem. Happens after about 25 minutes of highway operation. Cannot resume or reset cruise. Waiting for help from Toyota Canada now.

 

My CC is working fine, just the same as my '97 Camry.

One thought, you can pull the stalk forward, towards you, to disengage CC. Could this somehow be part of the problem? Disengage point is improper, sticky or just f#%^d up?

 

On my new 2012 Prius I had a somewhat similar problem with the one-shot function of the windshield wiper stalk. That is, if if I used intermittent wiper setting then the one-shot wiper setting would not work until I stopped and restarted the car. After a few failures like this I started jiggling the stalk and it seemed to do the trick, and with a lot of jiggling the problem has gone away (no more jiggling required) for the last month. So my conclusion was that there was some mechanical problem in the stalk, but why the heck would stopping and restarting the car affect a mechanical problem in a switch (maybe a soft switch that recalibrates with each car start)?

 

I'm not able to get my cruise control to engage

SGH-M919N ?