Pre-Collision Setting - Yaris *Cross*

[YarisHybrid2016]

Hi,

I need to emphasise I'm talking the Cross here... it seems to matter.

I may be dreaming, or mis-remembering something I read, but I'm sure I read recently about possible issues with the PCA on certain models not working as it should. The reason, IIRC, was due to mis-aligned/mis-calibrated RADAR on the nose of the car (the same as used by adaptive cruise).

Last weekend we took the Cross for a 700-mile trip to a friend's wedding, and I noticed that it didn't seem to care that I was cut-up by a significantly slower car. I was expecting the car to scream at me/brake, but nothing at all happened. I braked of course, so collision avoided, but I was unnerved at the total lack of response.

I then got probing the front-aspect collision detection, and alarmingly, it didn't seem to care about *anything*. I drove a "little too fast" when pulling up behind stationary traffic, and even made sure to have the lightest force on the accelerator, but nothing. We most certainly would have collided had I not immediately braked, and quite sharply.

I'm now questioning if it is working at all.

Adaptive cruise seemed to work fine, and correctly sensed even a motorcycle in front of us. Several times it entered tracking mode when the lane assist lost the lines, and adaptive cruise never skipped a beat when cars slowed or pulled in front of us.

Does anyone know of any issues with PCA, and whether this is worthy of taking it to be looked at?

Another issue I seem to recall, is the menu setting is backwards. You set one block for maximum sensitivity, and three blocks for minimum. Is this still the case? I did try both, but it didn't seem to make any difference. I haven't tried driving at the garage door yet.

[Bob66]

If you get "cut up" and the car is travelling faster than you....nothing kicks in.

My auto braking syetem stops me from hitting my garage wall....every day!

[YarisHybrid2016]

1 minute ago, Bob66 said:

If you get "cut up" and the car is travelling faster than you....nothing kicks in.

I would expect that! They were slower than us though, which was the problem! I'd have expected the car to have reacted. They weren't miles away when they did it.

[CruxisCore]

17 minutes ago, YarisHybrid2016 said:

I would expect that! They were slower than us though, which was the problem! I'd have expected the car to have reacted. They weren't miles away when they did it.

It also knows whether you react. It only goes REEEEEEEEEEEEEEEEEEEE if the driver doesn't seem to take action it deems necessary

[YarisHybrid2016]

Time for the cardboard dummy.

[Primus1]

Still trying to persuade the missus to stand in front of the car to test the system…..🤭

[CPN]

13 hours ago, YarisHybrid2016 said:

Another issue I seem to recall, is the menu setting is backwards. You set one block for maximum sensitivity, and three blocks for minimum. Is this still the case? I did try both, but it didn't seem to make any difference.

I think you are wrong there... (having read the manual) The blocks represent "distance to the car in front". So, three blocks = ideal stopping distance related to the speed. Whereas, two or one lets the car get closer to the car in front for when you are in a slow moving line of traffic so that you don't leave a gap so big that some moron pulls into it! (this is assuming that active cruise control is enabled and active of course...)

[YarisHybrid2016]

19 minutes ago, CPN said:

I think you are wrong there... (having read the manual) The blocks represent "distance to the car in front". So, three blocks = ideal stopping distance related to the speed. Whereas, two or one lets the car get closer to the car in front for when you are in a slow moving line of traffic so that you don't leave a gap so big that some moron pulls into it! (this is assuming that active cruise control is enabled and active of course...)

Thanks.

I'm not referring to the adaptive cruise bars, but the bars for pre-collision setting in the menu.

Let me see if I can find a reference.

[CPN]

3 minutes ago, YarisHybrid2016 said:

Thanks.

I'm not referring to the adaptive cruise bars, but the bars for pre-collision setting in the menu.

Let me see if I can find a reference.

Ah right! My mistake...

[Primus1]

My previous puma had this, the distance bars were in the central display with the speedo, it was always on, showing grey for normal distance, yellow for a bit nearer, and red for way too close, a useful feature, the cross seems to be only activated through the radar cruise..

[Trewithy]

10 hours ago, Bob66 said:

My auto braking system stops me from hitting my garage wall....every day!

So the auto braking works at very low speed.

[YarisHybrid2016]

1 minute ago, Trewithy said:

So the auto braking works at very low speed.

Don't confuse PCS with parking detection. I suspect at low speeds, it's the parking system that is doing the braking.

[Bob66]

13 hours ago, Trewithy said:

So the auto braking works at very low speed.

Yes....it's deffinitely the auto braking system....it flashes up in red "BRAKE" on dash , then applies the brakes.

The parking system....is something totally different !!!!!

[Bob66]

14 hours ago, YarisHybrid2016 said:

Thanks.

I'm not referring to the adaptive cruise bars, but the bars for pre-collision setting in the menu.

Let me see if I can find a reference.

It can only be switched on or off, within the settings.

The bars you mention , are for the sensitivity of the audio or visual alerts.

[Roy124]

Yaris Cross.   Yesterday my wife was inattentive for a moment and was accelerating into a slower car. 

In sequence I shouted the car said brake and my wife tried to brake hard. 

She was not fast enough as the brake pedal fell away from her foot and HAL took over.  There was no collision. 

It worked