Yaris DRCC/LTA does not follow car ahead

[MG95]

Hi everyone,

I have a 2024 Yaris Excel and I use DRCC and LTA a lot in the motorways (most of the mileage I do). I understood from videos that Toyota's latest DRCC/LTA system was supposed to track the path of the car in front when lanes are not found, but my car does not do that. If it cannot pick up on lanes then it will continue driving straight and cancel the system even if there is a car ahead which it could follow, like I have seen in online videos of the system.

Does the same happen to you? Is this a Yaris only thing (maybe the Yaris does not get this feature)? Is there a setting I am missing?

Thank you wall

[dash]

Does it follow the car ahead when LTA is turned off?

[Cyker]

It's automatic when you're in radar cruise mode AFAIK, but it's very inconsistent - Sometimes I get the 3 dots graphics to the car in front indicating it's following it, but often it doesn't and just beeps at me to take control (Or doesn't!).

TBH it's not great even when it does work, as it will steer to keep the car it's locked onto in front, to the point where it will cut a corner trying to follow it instead of following its path.

Distance seems to matter - Too close or too far seems to make it less likely to lock on; 2 bars distance seems to work most consistently when I've played with it but that might just be a fluke!

 

[MardyMarvin]

I did not think it was designed to follow a car in front ie track the path. Its designed to keep a set distance from the car in front which you set and then if it slows down so do you or if it speed up so do you to the max speed you set. Like wise if you have it set and pull into a lane with a slower car it will slow down or if you pull out into a lane with no car in front or faster moving traffic and you have set a faster speed then currently traveling it will speed up. You have it help with corners by moving the wheel a little and it will keep you in the centre of the lane or even if it detects a large lorry when you are overtaking it will then move you to the right hand side more but keep you in the lane. Thats why it soon says get your hands back on the wheel as its not designed to follow cars like some sort of autopilot.

This is from the manual.

This dynamic radar cruise control detects the presence of vehicles ahead, determines the current vehicle-to-vehicle distance, and operates to maintain a suitable distance from the vehicle ahead. The desired vehicle-to-vehicle distance can be set by operating the vehicle-to-vehicle distance switch

[Cyker]

Yeah that just describes the radar cruise control, but the car does have limited auto-steering too.

Normally it just follows road markings, but in their absence it has a limited ability to follow the car in front and steer to follow it, but it doesn't work anywhere near as well as the normal lane-tracing auto-steer.

 

[MikeSh]

3 hours ago, Cyker said:

but in their absence it has a limited ability to follow the car in front and steer to follow it,

Is that documented? Or what you think you have seen happening?

I'm OK with being wrong but I doubt Toyota would admit to any 'limited' ability in such systems, aside from the usual 'driver must pay attention ... blah, blah', stuff.

[Cyker]

Well the whole system is basically caveatted with a "you must pay attention at all times and keep your hands on the wheel" etc. warning  

I don't think your one has this, but in the Mk4s the LTA/LKA/whatever-the-heck-its-called auto-steering has two modes it switches between (You can't choose).

One is where it's following a car - This will show a car symbol in the dash with 3 dots in a row underneath it, indicating that it's locked onto a vehicle ahead (Could be a truck, a van, a car, a motorcycle or even a bicycle!) and is following it. It doesn't work very well, but it seems to be meant as more of a fall-back mode to keep guiding the car for brief periods when it has trouble locking onto lane markings.

The main mode is where it's just following the road lines - This will show blue lines parallel to the white lines on the dash, and may or may not show a car at the top depending on if the radar's seen one. It's pretty good at picking up dashed and continuous lines and following them, but seems to have trouble with un-painted kerbs. I suspect it uses infra-red to see them as the road markings have a strong infrared return while the kerbs don't. The car will much prefer this mode when the auto-steer is active, but if the markings disappear or do something to confuse the car it will sometimes try to fall back onto the vehicle-follow mode, but usually just beeps at me and hides in a corner until the lane markings come back.

The sudden "Nope all yours!" handover is very annoying when I'm busy trying to put my makeup on while eating a burger and trying to find that stray tictac in the footwell.

 

 

 

(That last part was a joke by the way. I just thought I'd mention that for the people who still inexplicably take everything I say seriously   )

[MardyMarvin]

4 minutes ago, Cyker said:

The sudden "Nope all yours!" handover is very annoying when I'm busy trying to put my makeup on while eating a burger and trying to find that stray tictac in the footwell.

(That last part was a joke by the way. I just thought I'd mention that for the people who still inexplicably take everything I say seriously   )

of course it would not be taken seriously no one eats tictac's 😆