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Old 07-12-2019, 09:06 AM   #1
chuckster57
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TPMS in Lexus

Ok, Full disclosure I am NOT familiar with the new (2007 Mandated) TPMS systems on cars/trucks. We just upgraded from a 2004 Honda accord and 2005 Mercury Mariner to a 2016 Kia Soul and a 2009 Lexus RX350.

NO issues with the Kia, but the Lexus is a different story. When the DW bought it she was all gaga that they put a new set of tires TPMS light came on in 2 days. She took it back and they did something and it stayed off for another week. Door pillar tire placard states 30 PSI, Tire sidewall states max inflation is 46 PSI.

I know mileage is better at 46 than 30, but can any TPMS guru give me a high school lesson on this stuff. I have read a lot and I know about checking battery level and such. Looking at buying the AUTEL TS501 as it will work on most all tpms systems.

My real question is how can I determine what the PCM/BCM says the pressure should be and can I CHANGE it?
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
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Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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Old 07-12-2019, 02:05 PM   #2
Tbos
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You may have to go to You Tube or a Lexus forum for that one. Good luck.
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Old 07-12-2019, 02:32 PM   #3
busterbrown
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As Tom mentioned, specifics on how to change TPMS thresholds may be best found on a Toyota or Lexus enthusiast forum.

Not that it will help, but with all 3 of my FCA vehicles, I purchased an android app and OBD2 BT adapter and can manipulate pressures thresholds as well as dealer controlled PCM settings (DRLs, tires sizes, activating non-factory options, etc). Best $49 I spent on my Chryslers. My RAM's thresholds are locked down from the factory at 65/80 PSI. Now, the dash isn't lit up like a x-mas tree when I air down when not towing.
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Old 07-12-2019, 02:34 PM   #4
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Thanks. I Actually got a response from AUTEL and they said what ever is on the placard on the door pillar is what it is and cant be changed without a bidirectional tool.....TOO MUCH $$$$. don't even know if Lexus can change it. Looks like more searching or phone calls as You Tube wasn't that much help. I have learned a lot though.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.

Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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Old 07-12-2019, 03:02 PM   #5
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Check the spare. I just read that some Toyotas (even Lexus) have TPMS on the spares.
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2017 Keystone Bullet 308BHS in Saddle.
2017 RAM 2500 Laramie Mega Cab 4x4 Hemi 6.4L
2008 GMC Yukon XL Denali (SOLD)
Hensley SwiftArrow Control Hitch with 1000 lb Spring Bars
Me, DW, (3) little DS's, and 1 rambunctious Boston Terrier

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Old 07-12-2019, 03:45 PM   #6
chuckster57
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Quote:
Originally Posted by busterbrown View Post
Check the spare. I just read that some Toyotas (even Lexus) have TPMS on the spares.

Will do. I wish I could take her car in and watch what they do. Iím probably going to buy the tool I mentioned since i do still work on cars. Canít afford the OTC bidirectional tool @ $2500.00.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.

Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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