DIY - Bypassing Tire Pressure Warning System (TPWS / TPMS)

[jimmykicker]

Originally Posted by CTScott

Looking at the EPC, the part number for your TPMS ECU is unique to the 07+ XB (89769-12030). I only have the 06 XB service manual, and since the TPMS wasn't added until 07, it's not covered. If you can track down the TPMS section of the service manual or at least the instrument cluster electrical wiring diagram, then I can tell you if this method will work. As far as location goes, the EPC shows a very poor representation of the location, but I think it is showing it as being behind the lower part of the C-pillar cover.

Now I am a bit confused about that. There was no 2007 Scion xb. 2006 models ran late, and they didn't introduce the new style to 2008.

Let me see what I can find out about the wiring diagram. Shouldn't be too hard to come up with. I'l probably just buy a service manual. It's the only car I have never bought one for. Thanks.

J

[CTScott]

Originally Posted by jimmykicker

Now I am a bit confused about that. There was no 2007 Scion xb. 2006 models ran late, and they didn't introduce the new style to 2008.

Let me see what I can find out about the wiring diagram. Shouldn't be too hard to come up with. I'l probably just buy a service manual. It's the only car I have never bought one for. Thanks.

J

In the EPC I was looking at build date, so the 2007's were really 2008's for the US.

[CrankyOldMan]

I had forgotten about having done this mod, until the light came on last week. Of course, I should have expected it since my winter tires don't have TPMS stems, but it still took me by surprise. Strangely enough, all I could think of when it came on, was of an anthropomorphic Yaris screaming, "I can't feel my tires! AAAAUGH!"

[jimmykicker]

Ah...gotcha. I will see what I can do. Thanks!

[yarisugi]

Don't know if 2004 is same as 2008.
Does this help, CTScott?

[CTScott]

Originally Posted by yarisugi

Don't know if 2004 is same as 2008.
Does this help, CTScott?

Different - That one has 16 pins whereas the 2008 has 12.

[yarisugi]

aw crap. oh well. Thought you had the EPC for all the Toyotas. hehe.

After Googling I came across this link.
Some member said it worked on their 2007 4Runner, is 2007 and 2008 different?

@carlisle737 - trade in your 4Runner for a Yaris.

[CTScott]

Originally Posted by yarisugi

aw crap. oh well. Thought you had the EPC for all the Toyotas. hehe.

After Googling I came across this link.
Some member said it worked on their 2007 4Runner, is 2007 and 2008 different?

@carlisle737 - trade in your 4Runner for a Yaris.

08 is different, as that 07 diagram still shows a 16 pin connector.

There are a bunch of ebay vendors that sell copies of the Toyota service manuals for about $10.

[BobGood]

Thanks, CTScott, for providing the bypass of the TPWS system on my 2008 Yaris. The lights out now. I had damaged my TPMS valve stem so I ordered one off of Ebay with the exact same serial number as my old one but once I had it installed at a local tire place the light remained on. I called the Service Dept for the closest Toyota dealership near me (an hour and half away from where I live) and was informed that the TPMS needed registering with the TPMS ECM which would cost me $90.00. Then I read in this thread that the battery in the TPMS would give out after 7 years or so and would then need to be replaced ($130.00 x 4 + $90.00 equals quite a bit of money). I then decided to try your suggestion in post #115 and it worked...and simple to do as well.

So, thanks again. :).

BTW, I registered here just so I could thank you.

Best regards,

Bob

[dave van muyden]

I tried this but by accident grounded the red wire now abs light on no powersteering and speedo doesnt work

[CTScott]

Originally Posted by dave van muyden

I tried this but by accident grounded the red wire now abs light on no powersteering and speedo doesnt work

You popped the 10A ECU-IG fuse, which is in the fuse panel under the bottom of the dash by the hood release.

[xiaoya]

Oops, I got it totally opposite. My wife is driving the car today, will fix it tomorrow.

Thank you very much CTScott

[maui]

I was just studying this TPMS sensor solution. Comparing photo #2 the the color coded diagrams, it looks like one just clips the brown wire and splices it to the white one, and that this would be easy using one of those press down splicers, and of course taping off the end of the other brown wire.

Please let me know if this interpretation is correct. Or if anyone has a picture of the completed splice please post.

Since this is reversible it looks like an easy solution.

Thanks,

Maui

[hatchbackkid82]

Will this work if you have a bad TPMS? My light flashes and stays on.

I'd rather disable it all together, stupid shop wants $320 for one sensor

[CTScott]

Originally Posted by hatchbackkid82

Will this work if you have a bad TPMS? My light flashes and stays on.

I'd rather disable it all together, stupid shop wants $320 for one sensor

Yes it would make the light go away.

[hatchbackkid82]

I did this over the weekend when i had my tires replaced. I had them pull the sensors out too. Worked like a charm. Thanks guys

[tradergordo]

I did this fix on a 2010 Yaris and it worked perfectly, so thanks a lot! But now I want to do the same on a 2014 Yaris (4 door hatchback) but I don't see the TPMS ECU behind the glove box. Does anyone know where it is? I couldn't find any free repair manuals online like there are for older models, cheapest one on eBay is $60...

[CTScott]

Originally Posted by tradergordo

I did this fix on a 2010 Yaris and it worked perfectly, so thanks a lot! But now I want to do the same on a 2014 Yaris (4 door hatchback) but I don't see the TPMS ECU behind the glove box. Does anyone know where it is? I couldn't find any free repair manuals online like there are for older models, cheapest one on eBay is $60...

There is not a simple solution for 3rd gen (2012+), as the TPMS ECU now sends the info to the cluster via CAN bus message, rather than by a simple single line driving an LED.

The third gens do allow you to easily relearn the TPMS sensors by simply pressing a button, so the simplest solution is to have a second set of sensors in your alternate rims.