DIY - Bypassing Tire Pressure Warning System (TPWS / TPMS) - Page 7 - Toyota Yaris Forums

regal · 05-30-2009, 07:57 AM

I finally got it to work after cutting about half the waires off, I am using a different 12V source and the voltage divider, the TPMS unit is unplugged. Not pretty but does work. CTScottt mentioned there is a regulated 4V signal coming out of theTPMS uit, I couldn't find one on my 09 only a 6V.

Treyz · 07-07-2009, 07:31 PM

Sedans don't get the DRL options like the lifback. My old '07 had them as well as my new '09.

I did the switch today. I had to leave it dangleing because I don't think the quick connects (splicers) made a solid cut through the facotry wires. I'll get to it eventually lol.

CTScott · 07-07-2009, 09:18 PM

Quote:

Originally Posted by Treyz

Sedans don't get the DRL options like the lifback. My old '07 had them as well as my new '09.

I did the switch today. I had to leave it dangleing because I don't think the quick connects (splicers) made a solid cut through the facotry wires. I'll get to it eventually lol.

Here's an even easier method that I figured out one day. I just haven't gotten around to writing up a DIY on it:

busdriver · 09-22-2009, 03:15 PM

CT Scott:
Great thread. Using your scematic, I did the fix in 30 mintues.
Thanks!

CodyTheBody · 08-09-2012, 04:17 PM

Quote:

Originally Posted by CTScott

Here's an even easier method that I figured out one day. I just haven't gotten around to writing up a DIY on it:

So this method replaces the very first post of this entire thread? I'd like the ability to switch back and forth between wheels. Put some different rims/tires and had the TPMS light come on and stay on.

CTScott · 08-09-2012, 04:42 PM

Quote:

Originally Posted by CodyTheBody

So this method replaces the very first post of this entire thread? I'd like the ability to switch back and forth between wheels. Put some different rims/tires and had the TPMS light come on and stay on.

Correct.

Treyz · 07-08-2009, 12:54 AM

So now we are back to three wires? I did the heat shrink and all with the 150ohms.

CTScott · 07-08-2009, 09:00 AM

Quote:

Originally Posted by Treyz

So now we are back to three wires? I did the heat shrink and all with the 150ohms.

It's not cutting the VSS and ESS wires (like the original started with). In doing some reverse engineering of the TPWS, I realized that it has a regulated 5VDC output that powers the radio receiver module. Tapping the white wire in pin 5 gives us this regulated voltage, so the resistor voltage divider isn't necessary. Both methods work, but this one is a bit more simple.

Keith Tinari · 07-28-2009, 12:01 PM

I just took off my rims, I will be doing this in a little to get the light off permanently.

regal · 07-28-2009, 12:29 PM

I found my 09 to have completely different colors, I used a DMM to find the right wires.

Keith Tinari · 07-28-2009, 12:38 PM

I re read this thread and realize I am not even close to competent to do this lol.

CTScott · 07-28-2009, 12:51 PM

Quote:

Originally Posted by Keith Tinari

I re read this thread and realize I am not even close to competent to do this lol.

Just look at post #115 above. As long as your wire colors/positions match up, it is quite simple, especially if you do the non-switch version. Basically, you clip one wire and tap it to another.

regal · 07-28-2009, 12:45 PM

learn how to use a DMM they cost like $6 at harbor freight, use the resistors to split a 12V line to 5V and send to the indicator light.

Liu997 · 08-19-2009, 11:06 PM

ehh I did the resistor thing anyway, so basically the resistors was just for a 5v dc?
Doesn't matter soldering is fun

Anyways you da man CT

jonismyname · 08-29-2009, 02:00 PM

i just completed this in 90 seconds with a pocket knife.

it'll take another 30 seconds when i have a piece of tape to finish.

bronsin · 09-23-2009, 02:12 PM

Hmm I bought a rim for my Yaris with a useable tire but no sender. What happens if the warning light goes off! Ok to put tape over it?

CTScott · 09-23-2009, 02:54 PM

Quote:

Originally Posted by bronsin

Hmm I bought a rim for my Yaris with a useable tire but no sender. What happens if the warning light goes off! Ok to put tape over it?

The light will come on eventually. It doesn't affect anything other than being annoying. You can tape it, or do the mod.

yarisugi · 12-21-2009, 10:18 PM

Thanks to them, I was able to make mine with a switch.

07-07-2009, 07:31 PM	#2
Treyz ~ ambient one ~ View User's Garage Drives: 2009 Bayou Yaris Liftback Join Date: Jan 2007 Location: Long Island, NY Posts: 1,046	Sedans don't get the DRL options like the lifback. My old '07 had them as well as my new '09. I did the switch today. I had to leave it dangleing because I don't think the quick connects (splicers) made a solid cut through the facotry wires. I'll get to it eventually lol. __________________ AMBIENTLIFESTYLE Tri-State Sport Compact EZine ambientlifestyle.com------------ambientlifestyle.ning.com Micro Image Store - Network - Online microimageonline.com------------microimage.ning.com

07-08-2009, 12:54 AM	#7
Treyz ~ ambient one ~ View User's Garage Drives: 2009 Bayou Yaris Liftback Join Date: Jan 2007 Location: Long Island, NY Posts: 1,046	So now we are back to three wires? I did the heat shrink and all with the 150ohms. __________________ AMBIENTLIFESTYLE Tri-State Sport Compact EZine ambientlifestyle.com------------ambientlifestyle.ning.com Micro Image Store - Network - Online microimageonline.com------------microimage.ning.com

07-28-2009, 12:01 PM	#9
Keith Tinari Scrubble with a poke. Drives: 2009 Yaris LB Join Date: Jul 2009 Location: Holland PA. Posts: 166	I just took off my rims, I will be doing this in a little to get the light off permanently. __________________ "If you cannot find truth right where you are, where else do you expect to find it?" Dogen

12-21-2009, 10:18 PM	#18
yarisugi やりすぎだ～ View User's Garage Drives: Me: Nuts: Join Date: Nov 2008 Location: ハワイ Posts: 2,041	thank you CTScott and Rick!! Thanks to them, I was able to make mine with a switch.

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05-30-2009, 07:57 AM	#1
regal Drives: 09 Yaris 3 Dr White LB Join Date: Mar 2009 Location: PA Posts: 432	I finally got it to work after cutting about half the waires off, I am using a different 12V source and the voltage divider, the TPMS unit is unplugged. Not pretty but does work. CTScottt mentioned there is a regulated 4V signal coming out of theTPMS uit, I couldn't find one on my 09 only a 6V. Last edited by regal; 05-30-2009 at 08:59 AM.

09-22-2009, 03:15 PM	#4
busdriver I've made a post! Drives: 08 Yaris Join Date: Sep 2009 Location: Kelowna BC Posts: 1	CT Scott: Great thread. Using your scematic, I did the fix in 30 mintues. Thanks!

07-28-2009, 12:29 PM	#10
regal Drives: 09 Yaris 3 Dr White LB Join Date: Mar 2009 Location: PA Posts: 432	I found my 09 to have completely different colors, I used a DMM to find the right wires.

07-28-2009, 12:38 PM	#11
Keith Tinari Scrubble with a poke. Drives: 2009 Yaris LB Join Date: Jul 2009 Location: Holland PA. Posts: 166	I re read this thread and realize I am not even close to competent to do this lol. __________________ "If you cannot find truth right where you are, where else do you expect to find it?" Dogen

07-28-2009, 12:45 PM	#13
regal Drives: 09 Yaris 3 Dr White LB Join Date: Mar 2009 Location: PA Posts: 432	learn how to use a DMM they cost like $6 at harbor freight, use the resistors to split a 12V line to 5V and send to the indicator light.

08-19-2009, 11:06 PM	#14
Liu997 Drives: 2008 Red Yaris LB Join Date: Nov 2008 Location: Hicksville, LI Posts: 125	ehh I did the resistor thing anyway, so basically the resistors was just for a 5v dc? Doesn't matter soldering is fun Anyways you da man CT

08-29-2009, 02:00 PM	#15
jonismyname Drives: 08 liftback 5spd Join Date: Oct 2008 Location: adirondacks, ny Posts: 220	i just completed this in 90 seconds with a pocket knife. it'll take another 30 seconds when i have a piece of tape to finish.

09-23-2009, 02:12 PM	#16
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,792	Hmm I bought a rim for my Yaris with a useable tire but no sender. What happens if the warning light goes off! Ok to put tape over it?