Help with TPMS bypass/disable

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TheGrrrrr said:
Can someone explain the 'why' on this mod? Not trying to be snarky, just legitimately want to understand the reason for wanting to get rid of the TPMS sensors.
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Hey Grrr, I've not seen notifications from this thread. I deployed my encapsulation widget when I had two sets of rims/tires, and the blinky is annoying when running 'the other set'. Also, I check pressure so frequently (thanks to InDeflate magic device) I hubrised this feature away. Beyond that, any time there is an opportunity to work around something that has its origin in some stupid gov't regulation it's gratifying to do so.
 
danny23 said:
Has anyone figured out how to bypass the TPMS? Ive done it on several other Toyota’s and Lexus by splicing together two wires. I haven’t seen any write ups for a 200 series. I located the wiring harness for the module, behind the passenger/rear panel but don’t know which wires will ground the module.

View attachment 2832201

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Hi, were you able to do it? Wanted to ask which wire to cut? Would like to do the same. Thanks
 
Bump. Has anyone figured out how to delete or bypass this useless system mandated by our nanny state?
 
Aside from putting 5 tpms in a small sealed container and pressurizing it?
I haven’t seen an electronic bypass yet. I suspect it would require putting a raspberrypi on the canbus spoofing the Tpms module messages.
 
HUZZAH said:
Bump. Has anyone figured out how to delete or bypass this useless system mandated by our nanny state?
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Upgrade your vehicle
IMG_3352.webp


Better, right?
 
I've never understood people wanting to get rid of such a useful system. Might as well disable your gas tank gauge.

Just a few weeks after buying my LX 5.5 years ago I got a second set of wheels for winter tires, installed a set of programmable, aftermarket TPMS sensors (Autel MX) into them, programmed the new sensors to the same IDs as my original, OEM sensors, and haven't had any issues since. Replace the wheels seasonally, the LX reads the "new" sensors just as if they were the old ones. Zero TPMS-related work to do, no problems, and peace of mind seeing my tire pressures at all times.
 
eatSleepWoof said:
I've never understood people wanting to get rid of such a useful system. Might as well disable your gas tank gauge.

Just a few weeks after buying my LX 5.5 years ago I got a second set of wheels for winter tires, installed a set of programmable, aftermarket TPMS sensors (Autel MX) into them, programmed the new sensors to the same IDs as my original, OEM sensors, and haven't had any issues since. Replace the wheels seasonally, the LX reads the "new" sensors just as if they were the old ones. Zero TPMS-related work to do, no problems, and peace of mind seeing my tire pressures at all times.
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Well maybe I just like to live on the edge. Sometimes, I'll put tape over my gas guage and count the miles on the trip just to see how close I can get to empty--it's a rush.
 
Here’s an example of an inane TPMS issue.

IMG_6668.webp
 
Go to Tundras.com. I bypassed my 2007 SR5. I’ve got a 2010 now. Gonna try a set of
Aftermarket sensors, the second they fail I’ll start clipping wires.
 
lx200inAR said:
Wouldn’t hitting the “set” button fix that issue? I don’t remember what the max value the system will set as default is. Maybe it’s too low.
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Yeah, looks to me like the TPMS reset was last done with the spare over-inflated (as I do, buys more time before I have to top it up), and it bled down.

I could be totally wrong though.
 
bloc said:
Yeah, looks to me like the TPMS reset was last done with the spare over-inflated (as I do, buys more time before I have to top it up), and it bled down.

I could be totally wrong though.
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So the theory here is if I put the spare back to 65 psi the light will go off. So it remembers the specific pressure of each tire?

I had a flat recently (some sort of 3/8” construction bolt), and actually had to use my spare. I pulled the extra air out of it for use.

I have tried the tpms reset button, but it seems to really like it the current setting and is resistant to change.
 
grinchy said:
So the theory here is if I put the spare back to 65 psi the light will go off. So it remembers the specific pressure of each tire?

I had a flat recently (some sort of 3/8” construction bolt), and actually had to use my spare. I pulled the extra air out of it for use.

I have tried the tpms reset button, but it seems to really like it the current setting and is resistant to change.
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Yes it remembers each individual TPMS ID and the pressure when you do a reset, then triggers a light if you get some % under that number, which generally indicates a leak at that tire. So you are memorizing 65 as the "normal" operating PSI and it is triggering at 42 or around there.

Another way to go about it would be to set all of your tires including spare to the road tire cold pressure, do the reset, then inflate your spare up to whatever you want. This way the light will only come on when you really need to fill something. Or do a reset with it at 50 or so? Up to you.

I keep my spare at 50 and road tires at 33 around town then 42 for trips to eek out a mpg or two. I do my TPMS resets with the spare at 50 though, so even if I forget to check pressure, I'll get a light well before it is too low to be usable. Since my rig isn't my daily my old spare (a cheapo same-size AT on a damaged rim) would lose pressure quickly enough this was useful. With the switch back to to stock size Michelin Defenders they hold air so well it hasn't come up.

Edit: I believe @gaijin has posted in the past about the pressure alarm strategies toyota uses with their TPMS system, he'd probably know the conditions the computer looks for to trigger a light.
 
bloc said:
Edit: I believe @gaijin has posted in the past about the pressure alarm strategies toyota uses with their TPMS system, he'd probably know the conditions the computer looks for to trigger a light.
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Not just Toyota. Applicable regulation is Federal Motor Vehicle Safety Standard (FMVSS) No. 138 (found here: FMVSS-No138) wherein we can find the following (highlight mine):

Executive Summary Under section 13 of the Transportation Recall Enhancement, Accountability, and Documentation (TREAD) Act, the Secretary of Transportation was required to complete a rulemaking for a regulation mandating a warning system in each new motor vehicle to indicate to the operator when a tire is significantly under-inflated. Accordingly, the accompanying final rule requires a tire pressure monitoring system (TPMS) to be installed in all new passenger cars, multipurpose passenger vehicles, trucks, and buses that have a gross vehicle weight rating (GVWR) of 4,536 kg (10,000 lbs.) or less, except those vehicles with dual wheels on an axle. The final rule requires that the driver be given a warning when tire pressure is 25 percent or more below the vehicle manufacturer’s recommended cold tire inflation pressure (placard pressure) for one to four tires. (We note that the agency had previously issued a final rule providing two different compliance options with different levels of stringency. However, a court decision1 found that the TREAD Act requires a TPMS with a fourtire detection capability, so the court vacated the standard for further rulemaking consistent with its opinion.) The final rule also requires a TPMS malfunction indicator, as well as a warning when the system detects under-inflation of 25 percent or more in one to four tires.

HTH
 
grinchy said:
I have tried the tpms reset button, but it seems to really like it the current setting and is resistant to change.
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I'm sure your "problem" will be resolved by properly re-initializing your TPMS system. It can be a little finicky, so you might want to review the procedure.

Toyota hides the procedure for my 2013 LC200 in the do-it-yourself maintenance section of the manual, but I'm guessing the procedure will be pretty much the same for your LX570:

TPMS2_Reset_18JAN18_zps8pwuusr9.webp


It is important to carefully follow all the steps of the procedure.

HTH
 
One last thought @grinchy

If you do 5-tire rotations including the spare, and keep the spare at a higher pressure as you described, you'll need to do a reset every time you rotate.

Otherwise the ID that was stored with 65 as correct will alarm as soon as you put it at street pressure.
 
Yeah, that’s what it did.

Reset works with the engine running
Reset requires all 5 tpms to be detected and none below the low pressure threshold (mid 20s), can’t recall exactly where that one is at.
 
Now working on an off road only CANBUS based solution.
Got a basic R/W CAN logger and OBD2 breakout (CAN is available on OBD2 , at least some of the network) inbound.
First order of business is to see what messages and when the TPMS module is putting on the bus.
Then will be creating some simple code to keep the boot and normal mode messages alive when aired way down.
Finally burn all of that to a custom board and make a permanent installation or replacement.
 
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