This 5 volt source is the one generated by the engine ECU for all of the power-train sensors. I've considered using it for another purpose but did not because I wondered whether tapping into it could possibly cause driveability issues or phantom problems with a sensor that would be hard to diagnose. I simply do not know.

The OP is correct that certain years require that 5 volts be sent to the TPMS dash light LED to turn it off. Some have used 12 volts but I chickened out because during at certain times the voltage will spike to 14 volts or so. In the end I tapped into a 12 volt source and made a simple 5 volt stand-alone devise out of a few cheap semiconductors.

 

How does Taco'09 know all this stuff? Toyota tech? anyway I can only speak from the experience Ive had so far. On my 2009 taccoma I had routed the TPMS jumper wire to a +12v to turn off tpms light. I drove it for 8 months with no problems. I only tried this blue wire 5v thing recently on my new (to me) 2007 tacoma a few days ago but everything is good so far. I will report back in a month or so to let everybody know if anything goes wrong or not. To me, it seems fine. There is no voltage that comes from this blue TPMS wire, so all this is doing is feeding off the +5v wire. I guess you could say maybe it is changing the resistance on the blue wire providing the +5v? Anyway, I will happily be the guinea pig on this one..

 

KauaiYota, I cheat. I have all the technical manuals and have done a bunch of it myself. Even then I only get it right way less than 50% of the time lol.

The secret is when you have a success you brag it up......but when you smoke something you keep it quiet.

Please keep us posted on using that 5 volt source long term.

BTW, you will be really impressed when the real talent shows up and post.

 

to name a few?
You mean the likes of Pb, and toku58 to name a few?

 

TPMS Bypass

You can also make a small PVC pipe. Capped at both ends with the sensors inside. Add a metal tire valve on one end. Pressurize the tube. And put it in the trunk.

 

You can also make a small PVC pipe. Capped at both ends with the sensors inside. Add a metal tire valve on one end. Pressurize the tube. And put it in the trunk.

I can't find the trunk on my '09 Tacoma Access Cab.:facepalm: I guess that I'll have to tap into the wire.

 

Hello to all I have a taco 06 and Tried the ground to disable the TPMS on the dash, I tried several ground spots and the light still comes on, I even used an extended cable and tried the battery and still comes on. I was going to try to put 5v to the blue wire, but I'm not sure since that method is only for 2007 and up. Anybody here not successful that can give me a hint. I spent hours and still no able to get rid of the light on the dash. Any help will be appreciated.

 

U must have the wrong wire or your connection is not good. Did you use the one behind the glove box or behind the stereo? Did you cut it or just push a wire in the back of the connecter?

 

Strange? I did mine and worked like a charm. Light has been out for several days now with no issues. Nice to have that annoying light gone!

 

Take a voltmeter and test the wire you are putting to ground (with the key turned to on of course) I what is it reading?

 

thank you for the reply. for some reason, My taco is an 2006 but ground did not work, the light green wire to blue wire worked perfectly, it has been working for a week or so with out any problems. thank you again for all your help.

 

FYI: 2014 spare has no TPMS, it's a different wheel, too; black steel & label says "For Temporary Use", even though it's the same tire as the other four. Probably "Temporary Use" because of no TPMS. Sounds like "lawyereze" to me.

 

Tried this on my 2006 Tacoma. Took 10 minutes and the tpms light is gone for good.
Thanks KauaiYota!

 

just checking back in here. its been months since I connected to the blue 5V wire and no problems at all! TPMS light still off and no adverse conditions.. this appears to be fine to do!

K

 

KauaiYota, thanks for the update....and where have you been? We have not heard from ya in a while.

Now try sending 12 volts back up to that sucker and see how long it lasts. Ha, just kidding.:grin:

Its always good when someone reports back that something they tried works and has not developed problems.

 

What's up taco 09. My truck is just too dialed in now! I consider it a GOOD thing when I don't have to visit the forums!

 

Subbed. Looking to do this on my 2015

 

Just used your advise and it's gone! Every year I put the snows on and that light flashed at me for 4 months. Not anymore.
Thanks!

 

Interesting discussion. I bought a set of 2013 steel wheels removed from a 2013 Tacoma for my 2013 TRD Tacoma, which came with alloy wheels. Not that steel vs alloy makes a difference. The wheels came with sensors and lug nuts. The lug nuts for a steel wheel are different than on an alloy. On my 2013, the warning lamp flashes, than goes solid. It took a few miles for that to happen. After a few trips, the same thing. For the last few trips the warning lamp doesn't come on at all. Is it possible the system sees the new sensors since they come from the same year? I know all the sensors are given individual ID numbers. Got the codes from the replacement wheels. Don't see why the wheels have different ID's since there's only one warning lamp.

 

I bet you're storing your alloys with the original sensors nearby at home. Your truck is reading those and not the steel wheel sensors. You have to program the sensors in the ECM before it will see them. They use different codes in case you have two Toyotas. And you certainly don't want yours going off telling you low pressure when you drive by another Tacoma/Toyota on the highway.

 

TPMS disabled in a 2012

Thanks, KauaiYota! I can verify the "blue to blue" behind the glove
box DOES work on a 2012 SRS ! I have hated TPMS systems since they were conceived ! If you cannot be trusted to check your tire pressure, you probably should not be driving !

 

Just tried this fix on my 2013 Tacoma and it worked fine to disable the orange light. I had put on some old rims with studded snows for the winter. Thanks.

 

A 7805 three pin regulator will give you an amp at five volts if it's heat sinked, from a 12 volt source, but even free standing you'll get enough to fool the TPMS without overloading the device. Left terminal to 12 V, center grounded, and right one is 5 volts. Just tape it up well after soldering. They were under a buck at Radio SHack, now you may have t hit the internet. I'd be very leary of messing with a 5 volt logic line from the ECU, for fear of a spike getting back to the ECU and letting all the magic smoke out.

 

2005 Tacoma did not have TPMS.

 

Thanks for posting this. I just did this mod for my '14 Tacoma. Using my voltmeter I found a blue wire that had +12V on it and connected it via a switch to the the blue wire that feeds the TPMS light circuit. I lowered the pressure on one tire to trigger the light and, then flipped my switch to "on", and the light goes off. My TPMS sensors are mounted on my aftermarket summer rims / tires, and I am installing Blizzaks on my factory steel rims for winter driving, but I did not want the hassle of dealing with another set of sensors. For the short 60 to 90 day time frame that we deal with winter in MD, I think I can manage to check the tire pressure manually.

 

Welcome aboard! :welcome: Please tell us where you obtained the switch and a part number if you would not mind.

FWIW I have not been advocating sending +12v back up to the LED. That LED was designed to turn off at 5v which is the trigger that comes out of the TPMS module.

Reason being that once you start the truck the voltage regulator can put out almost 15v for a short time depending on the charge in the battery and that is almost 3X the intended voltage. I've messed with LEDs enough that they can be easy to ruin. So on later trucks (not the earlier models) it would be wise IMHO to create a 5v circuit off that wire and then route that to the LED if you are so inclined.

 

^ Welcome to TN. Nice job on the switch with labeling and location.

 

Instead of mandating these expensive failure prone devices, we need simple legislation that if you sell gasoline then you must provide free compressed air and an accurate air gage. It also wouldn't hurt if people had to have basic maintenance training before getting a license to drive
I know so many people that have so much trouble with these tire pressure systems. It never ends.