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"Check BSM system" & warning triangle - 63 plate IS300H


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Hi All

I have a 63 plate IS300H Premier, a few days ago I popped into the grocery store, on the way back when pulling into the driveway, I randomly got this error "Check BSM System" with a warning triangle, I turned the car on and off again and have driven a couple of times since then and it has not reoccured.

My car is still under a approved used warranty, should I be raising this? It looks to be relating to the blind spot monitoring but I'm not 100% sure where the sensors are located in this car, due to covid I hardly drive it so the car is pretty clean, purchased it from a main dealer a few months ago and has about 62k miles with full Lexus history.

I'm hoping its a normal error people on here get from time to time, if not I may have to do some more digging 馃檪

Thanks

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The Manual states that this warning relates, as you suggest,聽to the Blind Spot聽Monitoring system. 聽As far as I can see, the only recommendation is to refer the car to a Dealer!

The sensors, I believe, are located in the wing mirrors and along the rear of the car.

As it鈥檚 still under warranty I would be inclined to do that ASAP.

Edited by LenT
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The fact you mentioned you hardly drive your car since covid, I'm going to take a wild stab at the problem, and point you to the auxiliary Battery in the boot. There's a good chance the Battery is on it's way out. All sorts of error messages pop up when the Battery starts to fail.聽

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I can鈥檛 help with the error message but earlier this week the dashboard on our聽CT was lit up like a Christmas tree and car would not start. 聽Called the AA out, 聽fault diagnosed聽to a flat Battery as the car currently is not being used as much as normal due to Covid (was doing a 250 mile, mainly motorway trip at least once a week). 聽I also contacted my Lexus dealer who advised the following聽

Run聽the car in ready mode for an hour, even longer if you can and probably once a week or once every 2 weeks to keep it charged up!

I hope this helps.

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take a photo of the message on the dash and email it to your dealer so there's a log of it happening whilst under warranty聽

and get your car booked in for them to look at it,

maybe contact lexus uk and inform them so they are also aware in case the dealer

can't get your car booked in until after your warranty has expired

you should still be covered then

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7 hours ago, Hemlag02 said:

Run聽the car in ready mode for an hour, even longer if you can and probably once a week or once every 2 weeks to keep it charged up!

Not really the ideal solution, for several reasons.聽 For example, it's not very environmentally friendly.聽 If the car's on the public highway, and unattended,聽it would be illegal.聽 And some say one hour barely compensates for the current used to start the vehicle.

A better solution is to buy a trickle charger.聽 I聽bought a CTEK and fitted聽sets of accessory plug-in connector leads to the Battery posts of both our cars.聽 Now all I have to do is plug the CTEK connector to the installed leads, turn on the CTEK and leave it overnight to do its thing.

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48 minutes ago, ColinBarber said:

The OP has a hybrid vehicle, no current is used from the 12v battery to start the vehicle.

Thanks for that info, Colin. 聽Hybrids are foreign territory to me, I must admit. 聽Lexus tend to loan me one when mine鈥檚 in for service and, to my shame,聽I have managed to stall them on a couple of occasions! 聽However, I聽think the other points are still valid - and two out of three ain鈥檛 bad!

But mainly I鈥檓 suggesting that in a low mileage situation and especially in winter, an easy-to-use trickle charger is a sound investment.

At least, that鈥檚 been my experience.

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6 hours ago, LenT said:

But mainly I鈥檓 suggesting that in a low mileage situation and especially in winter, an easy-to-use trickle charger is a sound investment.

At least, that鈥檚 been my experience.

Agreed. I think I've only done around 300 miles in my vehicle since April and I leave it permanently connected to a trickle charger. But I guess not everyone has the convenience of electrical power near the vehicle.

But I think I'd聽rather run an extension lead to my vehicle and use a charger once a week for a few hours rather than starting up the vehicle and sitting in it for an hour.

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1 hour ago, ColinBarber said:

But I guess not everyone has the convenience of electrical power near the vehicle.

That鈥檚 a whole new聽topic you鈥檝e opened up there!

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Thank you for all the replies, if no ones seen this error guess its not that common so i'll report it to the dealer and take it in when Covid figures are looking a bit better as it does not seem like a urgent issue (light has not since that one time).

I do drive the car for 10min every week just to keep the Battery topped up, i've not had any issues "starting" the car but hard to say what condition the smaller Battery is in, longest stretch its been without starting is 10 days but it did fire up without issues.

My only concern is, with my old car (E Class) even though it was under warranty they charged me diagnostics as they could not find a issue so the dealer could not claim under the Mercedes warranty, I was a bit worried about the same happening here if no fault found or are Lexus generally pretty good?

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36 minutes ago, corpjones said:

My only concern is, with my old car (E Class) even though it was under warranty they charged me diagnostics as they could not find a issue so the dealer could not claim under the Mercedes warranty, I was a bit worried about the same happening here if no fault found or are Lexus generally pretty good?

It's not your job to identify the problem, only to demonstrate the symptom.

If you can show the problem (in this case a message on the dash), it's surely up to them to find the issue.

I think Mercedes did you over there. Unless you weren't able to prove any problem or show them an error.

I doubt you'll have this issue in your circumstance, but if you did, I wouldn't be backing down!

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I got the money back from Mercedes in the end but it took a lot of back and forth, I was picking up the car at lunchtime during work so had to pay it to make it back in time, Mercedes service was poor most of time in my experience but i've heard Lexus is a lot better but once bitten twice shy 馃檪

I've taken a photo of the error message on dash in any case so I will show them that.

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5 hours ago, LenT said:

Thanks for that info, Colin. 聽Hybrids are foreign territory to me, I must admit. 聽Lexus tend to loan me one when mine鈥檚 in for service and, to my shame,聽I have managed to stall them on a couple of occasions! 聽

Len,

How do you stall a hybrid?

John

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11 minutes ago, OldTrout said:

Len,

How do you stall a hybrid?

John

I鈥檝e no idea John. 聽Which probably explains why I did it again, months later! 聽I can only think that being a stranger to the hybrid I thought it had stalled and, being at the head of a queue at traffic lights, did the wrong thing. 聽Whatever that was!

But whatever it was, I haven鈥檛 done it again.

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50 minutes ago, LenT said:

I鈥檝e no idea John. 聽Which probably explains why I did it again, months later! 聽I can only think that being a stranger to the hybrid I thought it had stalled and, being at the head of a queue at traffic lights, did the wrong thing. 聽Whatever that was!

But whatever it was, I haven鈥檛 done it again.

The engine is often not running when you stop but that doesn't mean it has stalled. When you press on the accelerator the car will move forward by the electric motor聽and depending on lots of things the ICE will assist聽sooner or later.

John

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38 minutes ago, OldTrout said:

The engine is often not running when you stop but that doesn't mean it has stalled.

Yes, I think that must have been it. 聽Note to self: must pay attention!

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  • 1 month later...

Just to update everyone, took car in and there were some errors suggesting communication was lost between between sensors, they reckon its the 12V Battery.

They kept it over 2 days and measured the 12V Battery which apparantly showed the level dropping to below a acceptable level, the batteries have a 3 week lead time so just waiting for it to arrive so they can fit it for me.

This started happening 3-4 months after I purchased it as a approved used car, it has been used at least once a week (to keep the Battery topped up) so I suspect the 12v Battery was faulty when I purchased the car, would you guys try and get the Lexus dealer I purchased it from to pay for the Battery?

Its not the end of the world if I have to pay for it but just a bit surprised it went so soon after I purchased the car, just thought i'd get some opinions 馃檪

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1 hour ago, corpjones said:

Just to update everyone, took car in and there were some errors suggesting communication was lost between between sensors, they reckon its the 12V battery.

They kept it over 2 days and measured the 12V battery which apparantly showed the level dropping to below a acceptable level, the batteries have a 3 week lead time so just waiting for it to arrive so they can fit it for me.

This started happening 3-4 months after I purchased it as a approved used car, it has been used at least once a week (to keep the battery topped up) so I suspect the 12v battery was faulty when I purchased the car, would you guys try and get the Lexus dealer I purchased it from to pay for the battery?

Its not the end of the world if I have to pay for it but just a bit surprised it went so soon after I purchased the car, just thought i'd get some opinions 馃檪

If you don't ask, you won't get.

I know what I'd be asking for.

What dealer did you buy it from?

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2 hours ago, corpjones said:

Just to update everyone, took car in and there were some errors suggesting communication was lost between between sensors, they reckon its the 12V battery.

They kept it over 2 days and measured the 12V battery which apparantly showed the level dropping to below a acceptable level, the batteries have a 3 week lead time so just waiting for it to arrive so they can fit it for me.

This started happening 3-4 months after I purchased it as a approved used car, it has been used at least once a week (to keep the battery topped up) so I suspect the 12v battery was faulty when I purchased the car, would you guys try and get the Lexus dealer I purchased it from to pay for the battery?

Its not the end of the world if I have to pay for it but just a bit surprised it went so soon after I purchased the car, just thought i'd get some opinions 馃檪

Any fault on a used聽car that becomes evident within six months of purchase is deemed聽to have been there at purchase. I think this is the gist of the law in this area. I鈥檇 research and then talk to the supplying dealership and quote聽the exact wording back to the dealership and ask for them to replace the Battery free of charge. They may not agree and you鈥檇 have to play hardball to get them to do it. A compromise might be that you agree to pay cost for the Battery and they fit it for free which might be say 40-50% of the normal fully fitted price.

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  • 2 months later...

Battery has now been replaced, the error stopped occuring on its own for some reason (maybe they charged the 12v Battery?) but i'll keep an eye on it, i've driven for a couple of hours and so far it looks like i'm getting 3mpg more since batt replacement.

A lot more driving is needed to see if this is consistent but a interesting observation for now.

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  • 4 months later...

I just got the same warning for(I think) the first time in about 4 years on a 64 plate is300.聽 聽Stop, start, all good no warning again...聽 聽Will keep an eye.聽 聽Apparently it's BSM=Blind Spot Warning system.聽 聽So, even if it does recur, it's not a STOP, DON'T DRIVE type warning.聽 聽Which is nice.聽 聽But hopefully all's well with you too.

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54 minutes ago, Robert Wilson said:

I just got the same warning for(I think) the first time in about 4 years on a 64 plate is300.聽 聽Stop, start, all good no warning again...聽 聽Will keep an eye.聽 聽Apparently it's BSM=Blind Spot Warning system.聽 聽So, even if it does recur, it's not a STOP, DON'T DRIVE type warning.聽 聽Which is nice.聽 聽But hopefully all's well with you too.

If it helps mine was resolved by Lexus replacing the 12v Battery so that was the cause, was easy for them to test the Battery too so might be worth doing?聽

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