Tpms light

[Alan64]

Does anybody know how to disable this light on an is300h

Thanks guys

[200h]

i havent heard of you being able to disable the tpms system

but personally i prefer a cure find the issue and resolve it,

it cant be much thats making the light come on

either an air leak or a Battery issue in a sensor 

[LenT]

Before you disable it, check that it isn’t trying to warn you of a problem!

If there’s no apparent problem, I’d try to turn it off by resetting it.  On my IS250 there’s a reset button tucked under the dash about inline with the steering wheel.  It’s hard to find.  In fact I had to get in the footwell with a torch to locate it.

To reset, first set the cold tyre pressures correctly.   Then in the ‘Ignition On’ mode, press and hold the button for three seconds.  The TPMS warning light should flash three times and then go out.  Stay in the ‘Ignition On’ mode for a few more ‘minutes’.

When you restart the light should be out.  If not, then there could be a tyre or valve problem.  The TPMS valves do work off a Battery that has a finite life, so they will all eventually have to be replaced!

Hope this helps.

 

[Alan64]

I have tried the above and the light keeps going back on, pressure is fine in the tyres and has been stable for some time so thats y i was looking to dissable it, i have seen some videos on utube but none for the is300h

[200h]

does your car tell you of the pressure in each tyre ??? if not

do you have any diagnostics to see what pressure each

sensor is reporting there maybe 1 thats under reporting the

pressure thus putting your light on

[Alan64]

No diagnostics on it i just have checked the pressures manualy i have a suspision its the front left as when i bought the car the guy said that tyre was running a slow punture a long time and he was just over inflating it rather than replacing the tyre so i would imagine this has done the sensor no good

[200h]

off to a tyre outlet then and see if they could

reseal the tyre on the rim for you and repair

any punctures you may have

[LenT]

32 minutes ago, Alan64 said:

No diagnostics on it i just have checked the pressures manualy i have a suspision its the front left as when i bought the car the guy said that tyre was running a slow punture a long time and he was just over inflating it rather than replacing the tyre so i would imagine this has done the sensor no good

Yes, that certainly might explain why the warning light keeps coming on.  But you should fix the fault, not disable the warning system.  That would be like taking the Battery out of a CO sensor because it keeps going off!

Incidentally, one tyre problem I discovered the hard way is that it’s best to fit plastic dust caps.  I discovered that I had one metal cap which had corroded onto the valve...which sheared off when trying to remove it.  This cost me £70 for a new valve.

But fortunately I had an emergency tyre in the boot, having ditched the rubbishy sealant system which would have been useless in this case.

 

 

 

[Alan64]

1 hour ago, LenT said:

Yes, that certainly might explain why the warning light keeps coming on.  But you should fix the fault, not disable the warning system.  That would be like taking the battery out of a CO sensor because it keeps going off!

Incidentally, one tyre problem I discovered the hard way is that it’s best to fit plastic dust caps.  I discovered that I had one metal cap which had corroded onto the valve...which sheared off when trying to remove it.  This cost me £70 for a new valve.

But fortunately I had an emergency tyre in the boot, having ditched the rubbishy sealant system which would have been useless in this case.

 

I have fit 2 new tyres 2 the front a few weeks ago and the pressure is fine with them but the light remains on so thats y i just wanted to disable it, i dont see the point in them i have been driving 30 years without any such system with no issues at all 🤔🤔

 

1 hour ago, LenT said:

Yes, that certainly might explain why the warning light keeps coming on.  But you should fix the fault, not disable the warning system.  That would be like taking the battery out of a CO sensor because it keeps going off!

Incidentally, one tyre problem I discovered the hard way is that it’s best to fit plastic dust caps.  I discovered that I had one metal cap which had corroded onto the valve...which sheared off when trying to remove it.  This cost me £70 for a new valve.

But fortunately I had an emergency tyre in the boot, having ditched the rubbishy sealant system which would have been useless in this case.

 

 

 

No diagnostics on it i just have checked the pressures manualy i have a suspision its the front left as when i bought the car the guy said that tyre was running a slow punture a long time and he was just over inflating it rather than replacing the tyre so i would imagine this has done the sensor no good

[Alan64]

I have fit 2 new tyres 2 the front a few weeks ago and the pressure is fine with them but the light remains on so thats y i just wanted to disable it, i dont see the point in them i have been driving 30 years without any such system with no issues at all 🤔🤔

[200h]

if the tyre pressures have been set to say 36psi but the tpms

system is set at 40psi then you may still get the warning light on

the dashboard , press and hold the tpms reset button to set the

new tyre pressures.

[Alan64]

Yes tried this several times, light stays off for a say 10 mins then pops back on 😡

 

[200h]

by any chance are the tpms sensors the original ones from when the car was new

[Alan64]

Tbh i couldnt be sure 

[200h]

since your GS is 12 / 13 years old if they are original they will probably be getting low on power

and we all know when the 12v accessory Battery starts to get low on power on our hybrids

we can get loads of spurious messages and issues with the car, my thinking is the batteries 

maybe be getting low on power and not reporting the tyre pressures correctly.

if you can get the id off the sensors it may be possible to find out when they where manufactured

you'll then know how old the batteries are.

 the carista paid version can give you the id from the tpms sensor

[Alan64]

Can these batteries be changed if it is them, oh the car is my 2013 is

[200h]

7 minutes ago, Alan64 said:

Can these batteries be changed if it is them, oh the car is my 2013 is

even though the batteries are 7 / 8 years old

if you have a look on the forum there is a guide on how to change them

i think the member went to a tyre bay and had the tpms valves removed and

had std valves fitted so he could work on the tpms valves at home

the member also purchased a new set of seals for when the valves where re fitted

 

[Vlady]

1 hour ago, Alan64 said:

I have fit 2 new tyres 2 the front a few weeks ago and the pressure is fine with them but the light remains on so thats y i just wanted to disable it, i dont see the point in them i have been driving 30 years without any such system with no issues at all 🤔🤔

The sensor could be damaged during tyres re-fitting! When  I bought the car, the garage swapped tyres (rear ones) and sheared off one of the sensors. Not a problem, they bought a new sensor and fitted it. The problem was that they never introduced the sensor to the car and my light was always on and could not be re-set, I took the car to Lexus garage and they fixed it.

So, if you have a new sensor, may be it was not fit properly and you need some coding or you have an old sensor with dead Battery.

[paulrnx]

I’d get it off to a dealership to have them check the TPMS system out

[LenT]

9 hours ago, Alan64 said:

I have fit 2 new tyres 2 the front a few weeks ago and the pressure is fine with them but the light remains on so thats y i just wanted to disable it, i dont see the point in them i have been driving 30 years without any such system with no issues at all 🤔🤔

You may then have a problem with the MOT.  On vehicles first used after 1st January 2012, under section 2:12 Wheels and Tyres section of the Car Parts Checked at an MOT list, the TPMS monitoring light is checked to ensure it’s functioning correctly.

You can check out these MOT requirements on the gov.uk site.

 

[LenT]

12 hours ago, paulrnx said:

I’d get it off to a dealership to have them check the TPMS system out

Alan64, possibly the best advice yet!  Thanks for raising the topic as I had no idea just how complex and varied the TPMS was until you raised it. No wonder even tyre specialists can get it wrong.

I did a search for TPMS MIL and found lots of info for auto technicians.  One US site was a page titled ‘Dealing with TPMS problems. Tips to avoid issues and diagnose glitches.’  

Two general points that leapt out at me were the warnings to only use plastic dust caps, as ferrous metal ones can interfere with the system, and not to use chemical type leak systems, which can block the valves.  It also confirms that the batteries in the valves have a seven to ten year life.

It also states that less than 40% of vehicles now have a system that can reset itself - and none of them appear to be Lexus/Toyota!

 

[Thackeray]

A possible problem is that one of the sensors has stopped transmitting. Either its Battery is flat or it's broken. Before spending lots of money at a dealership, as 200h says above you can find out which sensor is faulty by using a Carista OBD plugin adapter. There are more sophisticated and more expensive OBD adapters but the Carista is fine for checking tyre sensors.

I think they offer a free trial of their app. But if not I use a free app called Tire Assistant with the Carista adapter. Tire Assistant tells me the pressure reported by each TPMS sensor, its ID number and the tyre temperature.

If you see that one of the TPMS sensors is not reporting a pressure you'll know that this is what's turning the warning light on. You'll then have to work out which sensor is in which tyre by adjusting pressures and checking which sensor shows the changed pressure.

Here's a thread about Tire Assistant:

 

[paulrnx]

So spend money and time on self diagnosing or spend money on having a dealership diagnose. I’d prefer the latter but it’s clear that quite a few prefer the former. A personal choice I guess.

[Vlady]

Another advice, I knew what sensor was causing an issue by checking them visually, well, the garage I bought it from told me they put in a new sensor but I didn't know which one, so a visual check actually told me which one it was as it is a different colour to other three.

I took the car to Lexus garage to code the sensor in and it cost about £100, luckily the garage (the one I bought the car from) agreed to pay, the price would be higher if I didn't know what sensor was faulty, well, it is according to Lexus garage as would need to check every wheel and every sensor which takes time and money!

[paulrnx]

£100 to recognise a new sensor!!!! Blimey. Expensive.