Those with Pre Collision System be careful...
05-22-14, 04:59 PM
#32
Pole Position
Thread Starter
I could not find it! Well the PCS is going OFF. It happened again today but I was able to minimize it because I was able to react to it. I changed lanes behind a slow moving truck hauling a trailer and it kicked in once again right after I changed lanes. I can confirm that tapping the brakes disengages it, but I felt stupid brake checking cars I just slammed on brakes in front of. 
I also read the owner's manual and the list of things that could trigger the PCS is not worth it IMHO. There are way too many situations that could trigger it. It says that if the closing speed is greater than 10mph and if it believes there will be a collision it could be triggered. I wish I would have read that part sooner....
07-18-14, 11:00 PM
#33
Can anyone tell me if you get this option and disable PCS, does it stay off? And adaptive cruise is always on when cruise is on, right (regardless of PCS being off)?
Also, is this a common option or more of a special order option?
Also, is this a common option or more of a special order option?
07-19-14, 03:02 AM
#34
Driver
Join Date: Jul 2014
Location: IL
Posts: 119
Likes: 0
Received 0 Likes
on
0 Posts
...just wanted to say thanks for this thread - I plan to equip my 2015 IS with the "Dynamic Radar Cruise Control with Pre-Collision System" because the variable cruise control would be valuable to me, but this scenario of PCS interfering with slightly aggressive driving sounds pretty scary to me! Glad the two features can be enabled/disabled independently! 
07-21-14, 05:47 PM
#36
Pole Position
Thread Starter
Radar cruise with PCS is a special order option primarily. I had to special order mine as there were not many available in my area (east coast) with this option.
12-06-14, 04:50 AM
#38
This finally happened to me yesterday. The car slams the brakes. I'm very fortunate that the person behind me didn't rear end me but I'm seriously considering turning this off now
12-06-14, 05:34 AM
#39
Ok it's off now I'm scared.... I've seen it beeping and giving me the Brake warning but never triggered now I know it can get me rear ended
Last edited by faisal11ir; 12-06-14 at 05:38 AM.
12-07-14, 06:51 AM
#40
I was there before..
After this incident my entire dynamic in driving the car has changed. That beep now leaves me **** scared because I don't know at which point does it decide that beeping isn't enough and switch to JAMMING the brakes. It is quite alarming and I rarely brake that hard unless I'm almost hitting something. This happened to me on the highway where I was going about 120km/h
After this incident my entire dynamic in driving the car has changed. That beep now leaves me **** scared because I don't know at which point does it decide that beeping isn't enough and switch to JAMMING the brakes. It is quite alarming and I rarely brake that hard unless I'm almost hitting something. This happened to me on the highway where I was going about 120km/h
12-07-14, 09:34 AM
#41
I was there before..
After this incident my entire dynamic in driving the car has changed. That beep now leaves me **** scared because I don't know at which point does it decide that beeping isn't enough and switch to JAMMING the brakes. It is quite alarming and I rarely brake that hard unless I'm almost hitting something. This happened to me on the highway where I was going about 120km/h
After this incident my entire dynamic in driving the car has changed. That beep now leaves me **** scared because I don't know at which point does it decide that beeping isn't enough and switch to JAMMING the brakes. It is quite alarming and I rarely brake that hard unless I'm almost hitting something. This happened to me on the highway where I was going about 120km/h
12-07-14, 11:01 AM
#42
Driver School Candidate
Join Date: Sep 2014
Location: Hawaii
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
I was there before..
After this incident my entire dynamic in driving the car has changed. That beep now leaves me **** scared because I don't know at which point does it decide that beeping isn't enough and switch to JAMMING the brakes. It is quite alarming and I rarely brake that hard unless I'm almost hitting something. This happened to me on the highway where I was going about 120km/h
After this incident my entire dynamic in driving the car has changed. That beep now leaves me **** scared because I don't know at which point does it decide that beeping isn't enough and switch to JAMMING the brakes. It is quite alarming and I rarely brake that hard unless I'm almost hitting something. This happened to me on the highway where I was going about 120km/h
12-07-14, 02:27 PM
#43
Lexus Test Driver
The red "brake" warning happened twice on a city road.
The first one was when the car in front of me made a right turn to a plaza and PCS thought I would collide into it, despite there was at least 3-4 cars distance and I was traveling around 60km.h. . Probably I didn't slow down and changed the lane quick enough and the speed difference between my car and the car ahead of me (who was about to make a right turn into a plaza) has triggered the PCS. In that case, it didn't slam the brake as I slowed down a the back of the car which made the turn.
On the 2nd occasion, it was a false alarm -- I was on a twisty road on the left lane and there is another car approaching on the opposite lane. Maybe some reflection made the sensors think the car would collide me but in fact it was a normal scenario where two cars pass each other on opposite lanes.
