Road Sign Assist - intermittent bug

[LeeRM]

I have the same issue in my Yaris (72 reg Design 2 months old) didn’t think much of it and just dropped it in at the dealership. Wasn’t until I got in the courtesy car (speedy Aygo) that had the same issue I then started to think it was like my phone causing interference. Then I searched online and found this. I will find out what they do after it’s back from the dealership. 

[Max_Headroom]

Mine threw a wobbler yesterday and got stuck on 120mph, it corrected itself today.

 

[ISL]

I quite often get the ‘end of motorway’ sign for no reason at all.

We have no motorways in Herefordshire.

[Primus1]

I may have posted this before but, my Ford puma is the same, only it either doesn’t read the signs, or picks up signs that it shouldn’t, 20mph in a side street for example, it’s a bit concerning that  issues are appearing on Toyotas, hope mine will be sorted when it arrives, imagine the chaos when we eventually have self driving cars…

[LeeRM]

Update, I was informed that the technician did not experience the issues (7 miles as I checked on MyT app). I questioned it was a known issue and I was informed it was very limited. Where I replied that was odd as the courtesy car (72 reg Aygo) had the same issue so clearly not that limited. That comment just got the standard see how you go and if not bring it back. So far it didn’t have the bug on the way back home (24 miles). So we will see, however they did change the programming for the key fob to unlock/lock the windows so that’s something. 

[Roy124]

1 hour ago, Primus1 said:

, it’s a bit concerning that  issues are appearing on Toyotas, hope mine will be sorted when it arrives, imagine the chaos when we eventually have self driving cars…

Trust me, it won't. 

Yes self driving will be interesting. 

At the moment Highway authorities do not place a high priority on sign positioning and recognition. 

A regular problem is foliage.  What was properly visible when installed can soon be swallowed by vegetation.  My county kept saying it was the land owner's responsibility. 

This overlooked the impossibility for a land owner to cut back vegetation on narrow roads without road closures.  It also ignored their right to cut vegetation growing over a boundary. 

 

[Malcolm Preen]

An update from me.... still failing to get "Toyota Technical" to accept it is a fault (the MPH/KMH issue - not the misreading of signs which I accept is a "feature".

I've got one place / sign that regularly (about 50%) sets the car into KMH mode... It's 60 MPH sign with what looks like a light over it (I've only been there in the day time).

Once the car is in KMH mode this lasts for a while... (even over a coffee stop when the car is turned off and parked for over an hour), and in my experience every sign will be interpreted as KMH... 

Its on the A131 travelling North just before Great Notley Tesco in Essex if anyone else is down this way... Google Street view of the sign... https://www.google.com/maps/@51.8572329,0.5204658,3a,75y,293.19h,90t/data=!3m7!1e1!3m5!1sWOmIJhRtRlSaE8_NFo65qQ!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DWOmIJhRtRlSaE8_NFo65qQ%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D304.7404%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192

 

[Roy124]

Malcolm, interesting, I would go with the light.  I wonder which lane you were in and if there was any traffic in lane 1.  Does it think you are on a Continental road?  Most odd.

Also only one speed sign on either side.  I would report on Fixmystreet and a truck in lane 1, either way, can obscure the limit sign from cars in lane 2.

[YarisHybrid2016]

Maybe the system doesn't expect to see 60 MPH signs? The stuff that goes on in software development makes me hope none of these people do anything where lives are at stake... Oh wait... 😳

[Primus1]

On my puma I can link the speed sign recognition with the speed limiter, it’s interesting to say the least when it picks up a 20 limit sign and your doing 30, fortunately, I’ve not experienced it doing it at higher speeds, I don’t use it anymore as I believe the cross isn’t linked to the limiter and just alerts you if you exceed the speed, and I’m trying to acclimatise for when I get my cross

[YarisHybrid2016]

2 hours ago, Primus1 said:

On my puma I can link the speed sign recognition with the speed limiter, it’s interesting to say the least when it picks up a 20 limit sign and your doing 30, fortunately, I’ve not experienced it doing it at higher speeds, I don’t use it anymore as I believe the cross isn’t linked to the limiter and just alerts you if you exceed the speed, and I’m trying to acclimatise for when I get my cross

Cross has DRCC (Direct RSA Cruise Control) but it's manual, and allows you quickly set it to the RSA limit. The function is also optional and can be disabled (it prompts with a small box and arrow indicating direction to set when enabled).

[Malcolm Preen]

On 3/24/2023 at 10:27 AM, Roy124 said:

Malcolm, interesting, I would go with the light.  I wonder which lane you were in and if there was any traffic in lane 1.  Does it think you are on a continental road?  Most odd.

Also only one speed sign on either side.  I would report on Fixmystreet and a truck in lane 1, either way, can obscure the limit sign from cars in lane 2.

I was in the Inside lane - no adjacemnt traffic... - also, this is a repeater sign - there are a pair (one each side) further back down the road - but these don't have the light and don't cause the issue...

I've had it go wrong in various other places... but this one is my highest hit rate... (about 50% as I said).

I'm happy that its the light causing the "error" - but why won't Toyota Technical accept that it is a bug.... (I'm not holding my breath for a fix.... at this moment I'd be satisfied if they'd accept it's a bug and promise to look at the problem... but no progess yet...)

Servicing / Customer Service have hit the same wall of Techincal responding that it is a feature.... Sorry, IMHO, BULL**** - this is a bug... Reading signs from lorries and side streets is a feature.... changing to KMH is a bug......

So, when I get the next contact from Sales (trying to get me to trade in the car) - I'm going to give them both barrels... Not expecting a lot of luck...  (as I'm only one potential sale, and they've got my money for this one, so I "don't count" - which stinks, but appears to be the truth.

I'd like to think every owner reporting the problem would help.... but I don't think they care 😞

[Sidrat]

Took my car in today for it's first service, mentioned the update for the RSA and the MPH/KPH problem.  They told me that the RSA has nothing to do with the Cruise Control (CC), I told them they should read up on the technicalities of the vehicles they sell and service.  I took one of the technicians out and showed him how the RSA links and works with the CC, he had never seen it before.  I asked him how can they diagnose faults on cars if they do not know how they operate, silence.  They are raising a ticket with Toyota GB, I said I would not hold my breath after the fob offs others have had on here about this problem.

[Malcolm Preen]

3 hours ago, Sidrat said:

Took my car in today for it's first service, mentioned the update for the RSA and the MPH/KPH problem.  They told me that the RSA has nothing to do with the Cruise Control (CC), I told them they should read up on the technicalities of the vehicles they sell and service.  I took one of the technicians out and showed him how the RSA links and works with the CC, he had never seen it before.  I asked him how can they diagnose faults on cars if they do not know how they operate, silence.  They are raising a ticket with Toyota GB, I said I would not hold my breath after the fob offs others have had on here about this problem.

Lets hope you do get something....  Let us know either way...

[LeeRM]

Just sent an email to the sales guy, who said let him know if I ever had any issues (like they do) with the attached videos showing the issue. Saying unless they have a fix for this I’m not bring the car in. I’ll see how that’s goes. 

 

 

 

[ganjen]

Has anyone got any further information on this 'Road Sign Assist - intermittent bug' issue? My car started doing this for a couple of days now! I am hoping it will correct it self (i.e. interpreting the signs as MPH instead of KPH!). I would appreciate any update on this. Thanks

[Cyker]

I ask about a software update to make it less rubbish every service but am always told there are no software updates.

[Sidrat]

9 hours ago, ganjen said:

Has anyone got any further information on this 'Road Sign Assist - intermittent bug' issue? My car started doing this for a couple of days now! I am hoping it will correct it self (i.e. interpreting the signs as MPH instead of KPH!). I would appreciate any update on this. Thanks

Car went into dealers today for a recall update for the emergency call system, they also did an update to the RSA km/MPH problem.   So far it appears to be operating correctly.

[ganjen]

Thanks for the update Sidrat. Actually, we are thinking about ordering a Yaris Cross Excel with City pack which reduces the 9" multimedia display to 8", but comes with Toyota Touch® with Go Navigation. From memory, my previous car 2017 Prius Excel came with this and included basically error free speed notification/RSA! City pack also includes other goodies such as 360° Panoramic View Monitor and Advanced Parking Assist!!

[Malcolm Preen]

I've had my Yaris Design for a year now... I still get the KMH/MPH bug intermittently... and Toyota Technical still refuse to accept that it is a problem.

From my point of view, I can live with the "feature" where it sometimes picks up the wrong speed from a side street or a lorry... It annoys me, but I can see a reason for it happening. Similarly, misreads from a dirty camera...

What annoys me is the "random" switching to KMH - and the lack of acceptance from Toyota technical... To me, there is little need EVER to have both used - OK, if you drive abroad - but surely you'd want to change it deliberately.. not have a computer decide.... Imagine if, at the same time as switching to KMH it also changed the language to french (or german or italian!!!)

As I'm getting nowhere with technical - I'm back on the "Sales" route to process the problem.... Whilst I've no guarantee any other manufacturer would be any better.... I will NOT consider buying another Toyota based on my current experience with technical.

What really frustrates is the lack of acceptance that this is a problem by technical... I'd love the problem to be fixed now... but at present, I'd be more than happy with Toyota Technical accepting that it was a bug and that any solution would potentially be available with mk5 or mk6....

I'd be more than happy to run diagnostics - collect logs files etc.... But that needs instruction from Technical.... which needs them to accept that it is a problem....

Sorry for the rant!

[Cyker]

Yeah I've complained about this to cr@toyota.co.uk too - Would it be so hard to have a manual override setting, or just default to whatever the speedo units are set to??

The replies are generally along the lines of it's working as it's supposed to or take it to the dealer to diagnose (Which incurrs a diagnostic fee which would no doubt result in a null diagnosis and a loss of the fee, since the system is operating as designed so isn't something the dealer can 'fix'!)

I occasionally nag them for a software update but so far not had a positive reply. I don't really care since I ignore the RSA anyway, being so utterly unreliable (Being told the limit is 20mph on a 40mph A-road, and then 80mph a mile later, doesn't inspire confidence in its accuracy  )

I'm just glad it's not tied to the speed limiter like new-designed cars now have to have!!

[Sidrat]

Used it a lot today and so far it has not reverted back to KPH.  For me it was when being used with the Cruise Control (CC), especially when say driving in a 60 mph area and you change to a 40 mph, if you did a long press on the CC reduce speed instead of dropping to 40 mph it would go down to 24 mph, 40 kph equivalent. 

[ganjen]

I had been experimenting with a couple of things! Tuesday it started beeping (i.e. KPH rather than MPH), so at the end of journey (about 6 miles) I turned the RSA off and also pulled the USB stick out and then turned the power off. An hour later, got in the car and started it and RSA started automatically. Drove home and RSA was just fine (i.e. MPH not KPH)! This morning it was back to error!! Pulling the USB out didn't work. So, again stopped the car, turned RSA off and drove for about 2 miles and stopped and turned the power off. Waited for a couple of minutes and started the car with USB stick in. Surprise surprise, RSA worked as it should! So, it was not the USB...!

So, may be turning RSA off when powering off the car appear to be working 🙂. I will give this trick a go a few times and report back later.

Thanks for all your messages.

[Cyker]

The basic problem is it's not considered a bug - The logic is, if it sees a sign on the right-side of the car, it assumes it's in KPH, and if it's on the left it's assumed to be MPH.

Now, this is obviously stupid since we have signs on both sides, but that's what they went with and I can't see it being fixed any time soon.

I don't know if satnav-equipped cars are more accurate, but I know with us early Mk4 owners where the car doesn't even have satnav as an option, the system is just not fit for purpose.

[Malcolm Preen]

Hmm, maybe some progress... my local dealership has a new sales manager...

I've spoken at length to him... and he accepts that its a bug...

He's going to try and escalate and get Technical to accept its a bug...

Still not holding my breath.... but this sales manager has promised to get back to me next week....