Prius hybrid 2014. We had to make a hard emergency stop in a traffic situation. That activated the brake assist and the ABS and the slippery road warning light (though the road was not slippery). That’s fine, it was doing what it is supposed to. But now I don’t know how to turn it back off. I’m not asking about permanently disabling it, just returning to normal braking.
Not sure if this applies to you, but this advice was written for newer version of your car and might be of use, but might not: "you’re probably talking about the Pre-Collision System, to turn it off on the MID go all the way to the right with the arrow buttons to the vehicle settings and then scroll down to the Pre-Collision System On/Off you can turn it off which is not recommended. Instead you can adjust the sensitivity down to the lowest setting so it doesn’t brake so far away from the car in front of you.?"
From my Owners Manual: “Pre-collision brake assist When the system determines that the possibility of a frontal colli- sion is high, the system applies greater braking force in relation to how strongly the brake pedal is depressed.” “how do they feel different?”: Like taking a conventional braking system and having a very muscular human jam the brakes on (kind of, anyway). ie: pretty much like it says: it is assisting you in stopping since it doesn’t feel you are acting in a responsive enough manner.
Nothing in the manuals says the feature is anything 'sticky'. It just assists you harder when you brake hard. If the brakes feel like there's something that's now different about them, something else might be worth checking for.
That sounds even more annoying then Gen2 brakes getting super grabby and taking a while to adjust to when the dry season ends...
it would only be annoying if you have a tendency to tailgate. We have it set at the highest sensitivity and have only had it activate when pulling into the garage when the wheel stops were moved too far forward so it assumed we were going to hit the wall. But then again, in traffic we have a tendency to allow significantly more room between us and the surrounding vehicles than the typical North American driver.
The standard brake assist in a Gen 3 doesn't have a settable sensitivity or anything like that. I think you could get PCS in a Gen 3 in the advanced technology package, but that's its own thing.
On the 2014 Prius, the Pre-Collision System was offered only as an option to the top trim level, the Five. OP lists a trim level Three, which doesn't have PCS available. Here is the first brochure copy I was able to find (never mind the Canadian web location, it shows a U.S. brochure): https://cdn.dealereprocess.org/cdn/brochures/toyota/2014-prius.pdf
So it has Brake Assist yet it can’t be adjusted. Does it just kick in when the driver panic brakes, or is it activated by the Cruise Control System like in the Gen 4? EDIT: bad choice of words there: is it activated by the radar system like the one used in the Gen 4 Cruise Control System? ( now that’s confusing ). Hope you can decipher my question!
If OP entered the correct trim level, then this particular model/year/trim combination doesn't have a radar system or dynamic cruise control.
reset it with the paper clip trick in pin 4 & pin 13 in the obd plug / BUT, very very likely it'll come back with the next hard brake / same thing here; happened on the second day after I bought the car (new) - Toyota dealer pretty much blamed me for braking too hard & told me that the car is ok....
I would reset the system with a 12v disconnect. Either at the negative 12v battery cable or the white cable leading into the engine fuse box. If that did not work, a hybrid capable scanner like Techstream would help diagnose the problem. It is possible the brake booster/master cylinder failed, an all too common problem with this generation. When mine went out years ago it was after a panic brake.
Not the pre-collision and has nothing to do with radar or cruise control, the brake assist, the one people are describing as being like a muscular person jamming on the brakes. It did what it is supposed to, made sure we stopped in time. The trouble is now it won't stop doing it. Every time you touch the brakes, they jam on hard. (The ABS, brake, and slippery road lights remain on) Yes if it gets reset, we would expect it to do it again if we had to panic stop again. But we don't want it doing it all the time when when we are not panic stopping. There is probably some easy reset, but the manual doesn't say anything about it. This from Star Caller is probably what I am looking for: "reset it with the paper clip trick in pin 4 & pin 13 in the obd plug / " but I have no idea what it means. I will try the 12 v disconnect. Just turning the car off and back on did not reset it. Thanks for responses!
If you read this in time, stop before you disconnect any power or try to reset anything. The three warning lights you have on are telling you about a problem with your brake system. We need to find out what problem they are telling you about, so do not clear that information. It is not a matter of the brake assist remaining on. Brake assist does not remain on. It is simply a feature that assists harder when you brake urgently. But what you are experiencing now is the brakes behaving differently because of a problem, and what's needed is to find out what problem that is. You're lucky; that's a too-often-repeated misuse of the feature the car has for telling you what problem the brake system is reporting. The most important thing you can do right now (assuming you haven't gone and cleared the needed information yet) is to use that feature for what it's actually for, and find out what the trouble codes are. How you do that is explained here: Blink (a/k/a Flash) Codes – How to. | PriusChat For more about the 'trick' business, you can scroll down in that page to the "About clearing codes" section. If you are reading this too late, and you have cleared codes, and the car feels "better" now, before you think "yay, it's fixed", scroll down to the "When I clear the codes, everything is fine" section on that same page.
