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Lexus GS450h 2009 - TPMS #

Posted by Ian Butler on October 6, 2017, 6:00 pm

Year of Manufacture *: 2009

Hi All
Ive got an on going problem with a lexus GS450h that has lost its tpms id's and am having issues trying to rewrite to the tpms ecm. I purchased a tool from the States (WRTRST50) made by Bartech which is designed to take the vehicle out of open loop.I dont seem to be able to delete permanent codes C2126 and C2127 using Techstream. Ive tried reading the id's with an Autel 401 TPMS tool but there are no ids there.When I look on the data on Techstream it looks to have received the codes for the main set which I have taken from the sensors(with tyres off)and inputed myself. I have also tried driving the vehicle for 10 mins at 19kph or above after coding.
Has anyone had similar problems with Toyota/Lexus setup? Many thanks in advance

Re: Lexus GS450h tpms

Posted by Ian Baxter <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT1560' width='330' height='300' border=0 style='border:none;'> on October 6, 2017, 9:35 pm, in reply to "Lexus GS450h tpms"

Hello Ian,
Is your techstream a proper or a moody one ?
I've had problems with moody ones.

I use G-scan on Toyota/Lexus and always use O.E sensors even though they are expensive.

Sometimes I've had to remove all wheels and break the beads to manually read the codes, so I can write them in because the system doesn't know what wheel is where.

What does live data show?
In live data you can inflate and release pressure by hand and see which one shows movement.

Forgot to say those codes you have relate to tpms not seen/reconised for 2 sensors

Ian.

Re: Lexus GS450h tpms

Posted by Ian Butler <iframe src='https://members4.boardhost.com/ukautotalk/info/user=ukat3993' width='330' height='300' border=0 style='border:none;'> on October 8, 2017, 9:16 pm, in reply to "Re: Lexus GS450h tpms"
Ian Butler

Yeah hello Ian thanks for the reply. The techstream is a moody one but have used it before on something similar without any issues.The live data doesnt show an instant change to tyre pressure changes but does eventually catch up. The codes are being written to the ecm as I have tried changing them around and this does follow. The codes were obtained by manually removing tyres as they needed replacing thru wear.One thing I did find today was that a replacement sensor I installed (Schraeder) is not giving live data ie pressure or temperature.Ive tried reading all sensors with an Autel TS401 which incidentally states that the frequency should be 315mhz and im pretty sure the one I purchased through a reputable TPMS supplier was 430MHZ this obviously wont help matters and I will need to break the bead to double check. What I dont understand is why the sensors cannot be read by the Autel by choosing both types of frequency?Is there some means of waking these up?

Re: Lexus GS450h tpms

Hello Ian,
As far as I know the only way to excite the sensors is to let air out of the tyre or to inflate the tyre.
Ian

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