tyre pressure warning light

byrnew2007 · September 22, 2018

Hi all, i drive a 141 Lexus IS300h F sport and the other day the tyre pressure warning light came on. i put air in all the tyres 36 psi as directed by the manual and it turned itself off . i don't see an option in the menu that shows u on the screen what pressure is in each wheel which im surprised in a premium car as such when its on my sister's Hyundai jeep. am i missing something that i cant see it or is there just none on them ?

Thanks

ianhu · September 22, 2018

Sounds like mine.

I think the tpms pressure on the display came after my 2014 model though

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Herbie · September 22, 2018

My late (November) 2013 RX450h displays four separate pressures but doesn't identify which pressure relates to which tyre.

BrunoLeal · September 22, 2018

The 2015 models also don't have it as I asked someone here in this forum with a 152 car about that after watching this video:

It looks like Lexus uses different parts all over the world as the video sounds like from America.

Lexus quality is impressive but it's quite a disappointment in these small things, like equipping 2014 versions without ability to change the odometer units.

rayaans · September 22, 2018

They don't have individual readouts. They're just there to let you know tyre pressure is low.

I actually had my first puncture in 15 years yesterday and the tpms on my RX came on. I have the individual readouts so knew which one it was and found a large nail in there. Luckily it was repairable and Lexus did it FOC.

BrunoLeal · September 22, 2018

I had that on my 2006 volkswagen. BMW has individual readouts by default for sometime now (at least 2010 in 3 Series). It's really a shame that in a car of this class we have to guess which tyre is having issues if it's not fully flat...

It's even worse noticing that US "version" has this by default since 2013.

byrnew2007 · September 22, 2018

2 hours ago, ianhu said:

Sounds like mine.

I think the tpms pressure on the display came after my 2014 model though

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thanks for the reply mate 🙂

byrnew2007 · September 22, 2018

2 hours ago, Herbie said:

My late (November) 2013 RX450h displays four separate pressures but doesn't identify which pressure relates to which tyre.

thanks for the reply mate 🙂

byrnew2007 · September 22, 2018

2 hours ago, BrunoLeal said:

The 2015 models also don't have it as I asked someone here in this forum with a 152 car about that after watching this video:

It looks like Lexus uses different parts all over the world as the video sounds like from America.

Lexus quality is impressive but it's quite a disappointment in these small things, like equipping 2014 versions without ability to change the odometer units.

thanks for the reply mate 🙂

byrnew2007 · September 22, 2018

2 hours ago, rayaans said:

They don't have individual readouts. They're just there to let you know tyre pressure is low.

I actually had my first puncture in 15 years yesterday and the tpms on my RX came on. I have the individual readouts so knew which one it was and found a large nail in there. Luckily it was repairable and Lexus did it FOC.

thanks for the reply mate 🙂

Hadrian · September 23, 2018

Mine came on for the first time, just after the spell of hot weather. I had to get the Lexus chappie to show me how to do a reset.

He said he'd had a number of people with the same issue, as the sensors are so sensitive.

Best not to do a reset at the working pressure. Reset when pressuresare a few psi below , then inflate.

Richard1200 · September 23, 2018

15 minutes ago, Hadrian said:

Mine came on for the first time, just after the spell of hot weather. I had to get the Lexus chappie to show me how to do a reset.

He said he'd had a number of people with the same issue, as the sensors are so sensitive.

Best not to do a reset at the working pressure. Reset when pressuresare a few psi below , then inflate.

Agree. Reset is needed. The reset button is hard to find. It’s down under on the right above your leg. It’s just a black button. You can only see it by getting out on your knees by the door and look up under the cover. Press and hold, see manual.

Rabbers · September 23, 2018

Not having previously owned a car with a 4-Tyres Pressure Monitor, my IS300h having had only the generic low-pressure warning despite it being the top-spec Premier model, I was so happy about its presence in my new RC300h F-Sport that I posted my impressions of it in the RC Forum (see In Praise Of The AL-TPWS etc., started December 26, 2016). I subsequently learned that the AL-TPWS was standard only on Continental European RC F-Sport models, and I suspect from the present thread that this has also remained the case with the IS. If so, I would be at a loss to understand the reason why. I confirm my enthusiasm for the AL-TPWS, which I use at least once a week to check if any single pressures need adjustment, which is something I was always too lazy or forgetful to do as regularly.

Tel · September 23, 2018

My experience is that on the first low temperature day my Lexus can display the Warning sign but goes off & never returns when said tyres get warmed up.

On the Yaris, same as above, but System has to be Initialised.

Easy to set from sitting on the drivers seat with the engine running once you know where the switch lies i.e. in the horizontal plane above the accelerator pedal.

Tel

NemesisUK · September 23, 2018

55 minutes ago, Rabbers said:

Not having previously owned a car with a 4-Tyres Pressure Monitor, my IS300h having had only the generic low-pressure warning despite it being the top-spec Premier model, I was so happy about its presence in my new RC300h F-Sport that I posted my impressions of it in the RC Forum (see In Praise Of The AL-TPWS etc., started December 26, 2016). I subsequently learned that the AL-TPWS was standard only on continental European RC F-Sport models, and I suspect from the present thread that this has also remained the case with the IS. If so, I would be at a loss to understand the reason why. I confirm my enthusiasm for the AL-TPWS, which I use at least once a week to check if any single pressures need adjustment, which is something I was always too lazy or forgetful to do as regularly.

I too find this feature very useful on my RC300h. I check the readings every trip and find it quite interesting how the pressures rise during the drive. Can be significantly different side to side and front to back, depending on how twisty the route is and how enthusiastically driven 😁

Rabbers · September 23, 2018

6 hours ago, NemesisUK said:

I too find this feature very useful on my RC300h. ...

Thanks for confirming that the UK RC F-Sport has the AL-TPWS. I had never been convinced by information to the contrary even though I had it from a Swiss Lexus mechanic just returned from training in the UK. There was a bit of confusion at the time about specifications, early promotional literature and some pre- launch reviews having mentioned things like a G Force meter and a wireless phone charger which in fact never materialized.

byrnew2007 · September 23, 2018

Thanks all for the replies. i read that after 5 years or so the lithium Battery i the tyre pressure sensor die and new ones need to be replaced and the cost is nearly £200 through a main dealer ? can you just take these out and go back to normal valves in the tyres or would the ecu in the car not allow this ? as great all all these gadgets are in modern cars all they end up been is an expense down the road. also due to no spare wheel if u get a puncture and u have to ur the gel to put in to get u to a garage will this ruin the sensor that is in the tyre and can tge tire be fixed and used again afyer this gel is put into the tyre to get u to a garage to fix ??? thanks .

NemesisUK · September 23, 2018

The batteries can be replaced if you fancy a bit of DIY.

Britprius did a great thread on the subject here

Rabbers · September 23, 2018

Notwithstanding the clarity of Britprius’ instructions, any attempt on my part to follow them in the event of need would place me so embarrassingly out of my depth as to lead me to take my trade to a tyre specialist who would do the job more cheaply and almost certainly no worse than Lexus.

ianhu · September 23, 2018

I had a tpms issue with one of mine when I bought the car. The fact of the matter being that the previous owner never had one tpms replaced. This leads to the indicator being on permanently.

Then I had a tyre replace and asked for the tpms to be replaced too. This was a general run of the mill tyre place. This is pertinent since after fitting a new tpms. Indicator light still lit. "just drive around a while it will learn the new ID or the tpms" - utter rubbish.

I had to get techstream out and program it to the car inputting the new tpms ID.

Garages who changed tyres should know this about certain cars. But it seems they dont

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byrnew2007 · September 23, 2018

not only are they costing us a fortune when mechanical problems fail now they are hitting us with stupid sensors in tyres that for years there was no need for them and now there is. its nearly a luxury to own a car these days to maintain them and it will keep getting worse with all there new tech and gadgets there putting in cars .

rayaans · September 24, 2018

9 hours ago, byrnew2007 said:

not only are they costing us a fortune when mechanical problems fail now they are hitting us with stupid sensors in tyres that for years there was no need for them and now there is. its nearly a luxury to own a car these days to maintain them and it will keep getting worse with all there new tech and gadgets there putting in cars .

Whilst I do agree have to say tpms does work and in my case potentially saved me from something worse

I was planning to go on a long trip over the weekend and if the tpms hadn't gone off it's likely I wouldn't have seen the screw. Could have been potentially nasty with whole family in the car

Pink · October 15, 2018

My 300h is the first car with sensors in the actual valves. Previous car (5 series) system was based on the rolling diameter of the tyre.

So when it comes to needing a new tyre, do tyre-places know how to deal with this system please? Presume I’ll have to specifically mention it to them, but reading the above, does the car then need coding to register a new tyre? Can they reinstall in existing valve or do they need to put a new one in each time? Thanks

Britprius · October 15, 2018

11 minutes ago, Pink said:

My 300h is the first car with sensors in the actual valves. Previous car (5 series) system was based on the rolling diameter of the tyre.

So when it comes to needing a new tyre, do tyre-places know how to deal with this system please? Presume I’ll have to specifically mention it to them, but reading the above, does the car then need coding to register a new tyre? Can they reinstall in existing valve or do they need to put a new one in each time? Thanks

The car does not require new tyres to be registered, and the valve only needs replacing if the transmitter on the valve stops working "usually due to Battery problems". If a new valve is required then that has to be registered into the cars system.

John.