DIY - Bypassing Tire Pressure Warning System (TPWS / TPMS) - Page 5 - Toyota Yaris Forums

Tiddlygoose · 01-21-2009, 07:20 PM

Quote:

Originally Posted by CTScott

The dealer can't disable it.

Can you take some pictures of your wiring, so I can help you troubleshoot it?

Mine has been running fine disabled (no light) since I posted the updated version on 11/30/08.

Cool, I appreciate it. I think at this point I shall wait until it warms up above freezing. I nearly got frostbite on my fingers when I did this a few weeks ago... I will live with the light for now.

ricktoyota73 · 02-25-2009, 11:40 PM

Ok, so on a new project, I should use 130 ohm resistors, correct?
I have a bunch of 20 guage wire. Is that ok to use?
CTScott...how did you figure this shit out?
I have been working in the parts department of car dealers for the last 10 years and, from the things I've seen over the years, you never want to cut the factory wire harness. I will definitely leave enough wire where I can reconnect the SOB, but it still scares the crap out of me. It will be worth it to get rid of the cursed light, though.

CTScott · 02-25-2009, 11:58 PM

Quote:

Originally Posted by ricktoyota73

Ok, so on a new project, I should use 130 ohm resistors, correct?
I have a bunch of 20 guage wire. Is that ok to use?
CTScott...how did you figure this shit out?
I have been working in the parts department of car dealers for the last 10 years and, from the things I've seen over the years, you never want to cut the factory wire harness. I will definitely leave enough wire where I can reconnect the SOB, but it still scares the crap out of me. It will be worth it to get rid of the cursed light, though.

110 to 150 ohm resistors will work - Just make sure they are 1/2 Watt.

Cutting into factory harnesses can be dangerous if you don't know what you are doing. I design more complex systems for a living, so I enjoy reverse engineering automotive systems.

ricktoyota73 · 02-26-2009, 04:41 PM

Quote:

Originally Posted by CTScott

110 to 150 ohm resistors will work - Just make sure they are 1/2 Watt.

Cutting into factory harnesses can be dangerous if you don't know what you are doing. I design more complex systems for a living, so I enjoy reverse engineering automotive systems.

I sell auto parts and I honestly don't understand how half of this stuff works!
Thanks for the info. Hooking it up as soon as we get a weekend above freezing and I can stand to be out in the garage for a while.

ricktoyota73 · 03-17-2009, 08:09 PM

Just curious, if I'm not putting in a switch and don't care if I ever enable the system again, can I just cut and connect the wires to the resistor package instead of using tap splices?

CTScott · 03-17-2009, 08:24 PM

Quote:

Originally Posted by ricktoyota73

Just curious, if I'm not putting in a switch and don't care if I ever enable the system again, can I just cut and connect the wires to the resistor package instead of using tap splices?

Yes you can.

I wrote it up with use of the tap splices keeping in mind that many people are not comfortable soldering under the dash (and in relatively close proximity to the passenger air bag).

mikenacarato · 03-17-2009, 09:15 PM

Quote:

Originally Posted by ricktoyota73

Just curious, if I'm not putting in a switch and don't care if I ever enable the system again, can I just cut and connect the wires to the resistor package instead of using tap splices?

thats what i did and it works fine, i even removed both TPMS modules, one under the dash and one in the paneling behind the trunk. theres a good .02 lbs and weight saved!

ricktoyota73 · 03-17-2009, 09:07 PM

So, just using butt connectors not a good idea (uh huh huh huh...I said "butt" huh huh)?

CTScott · 03-17-2009, 09:28 PM

Quote:

Originally Posted by ricktoyota73

So, just using butt connectors not a good idea (uh huh huh huh...I said "butt" huh huh)?

Butt connectors are fine - Just don't use big ones (unless you like that kind of thing...)

ricktoyota73 · 03-17-2009, 09:18 PM

Funny about the weight savings!

regal · 03-23-2009, 04:57 AM

When doing this will there still be an OBDII code? I ask because to pass emissions in PA you can't have any OBDII codes.

CTScott · 03-23-2009, 07:47 AM

Quote:

Originally Posted by regal

When doing this will there still be an OBDII code? I ask because to pass emissions in PA you can't have any OBDII codes.

The TPWS does not report codes over OBDII, so you should be fine. It's data is accessible over the CAN bus, but a Toyota specific communication tool is required to access the data.

AznGouki · 04-13-2009, 05:55 PM

Does every yaris have it? I have the base with no AC 08. Any way to verify before I start looking for the module?

Taiyaki · 05-19-2009, 05:17 PM

Ok so to get rid of it without a switch all you have to do it start off with the light not on, turn off the car, unplug the thing, and cut the green and brown wire and connect them to eachother, and leave the harness unplugged?

CTScott · 05-19-2009, 05:39 PM

Quote:

Originally Posted by Taiyaki

Ok so to get rid of it without a switch all you have to do it start off with the light not on, turn off the car, unplug the thing, and cut the green and brown wire and connect them to eachother, and leave the harness unplugged?

Jump to post 45 and you'll see the resistor voltage divider. You need to make one of those up. Clipping the wires turned out to not work.

gwasabi · 05-19-2009, 05:21 PM

no i think u gotta put resisters in between?

Taiyaki · 05-20-2009, 03:56 AM

Ok i think ill just put a switch in it.

CTScott · 05-20-2009, 07:34 AM

Quote:

Originally Posted by Taiyaki

Ok i think ill just put a switch in it.

Just to clarify; adding the switch doesn't really make it any easier. If you want to do it without the switch, you build the voltage divider shown below (from page 3 of this thread). You unplug the TPWS connector (and leave it disconnected) and connect the red wire to the red wire show below, the black wire to the white wire shown below, and you connect the green wire to the brown wire below.

The switch method is just for people who run two sets of rims with one of the two sets still having the sensors installed.

04-13-2009, 05:55 PM	#13
AznGouki Metsu Drives: NCP91 ; E36 Join Date: Oct 2008 Location: Calgary Posts: 154	Does every yaris have it? I have the base with no AC 08. Any way to verify before I start looking for the module? __________________

05-19-2009, 05:21 PM	#16
gwasabi View User's Garage Drives: 07 Blazing Blue LB Join Date: Jun 2007 Location: Honolulu, Hawaii Posts: 692	no i think u gotta put resisters in between? __________________ Most Satisfying Crew Serious Business... MunkyWurks Garage - 8088488794

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02-25-2009, 11:40 PM	#2
ricktoyota73 Drives: 2014 Yaris 3-Door Join Date: Oct 2008 Location: Kalamazoo, MI Posts: 33	Ok, so on a new project, I should use 130 ohm resistors, correct? I have a bunch of 20 guage wire. Is that ok to use? CTScott...how did you figure this shit out? I have been working in the parts department of car dealers for the last 10 years and, from the things I've seen over the years, you never want to cut the factory wire harness. I will definitely leave enough wire where I can reconnect the SOB, but it still scares the crap out of me. It will be worth it to get rid of the cursed light, though.

03-17-2009, 08:09 PM	#5
ricktoyota73 Drives: 2014 Yaris 3-Door Join Date: Oct 2008 Location: Kalamazoo, MI Posts: 33	Just curious, if I'm not putting in a switch and don't care if I ever enable the system again, can I just cut and connect the wires to the resistor package instead of using tap splices?

03-17-2009, 09:07 PM	#8
ricktoyota73 Drives: 2014 Yaris 3-Door Join Date: Oct 2008 Location: Kalamazoo, MI Posts: 33	So, just using butt connectors not a good idea (uh huh huh huh...I said "butt" huh huh)?

03-17-2009, 09:18 PM	#10
ricktoyota73 Drives: 2014 Yaris 3-Door Join Date: Oct 2008 Location: Kalamazoo, MI Posts: 33	Funny about the weight savings!

03-23-2009, 04:57 AM	#11
regal Drives: 09 Yaris 3 Dr White LB Join Date: Mar 2009 Location: PA Posts: 432	When doing this will there still be an OBDII code? I ask because to pass emissions in PA you can't have any OBDII codes.

05-19-2009, 05:17 PM	#14
Taiyaki アキバ製 View User's Garage Drives: 09' White LB, Celica GTS Join Date: Apr 2009 Location: Honolulu, HI Posts: 524	Ok so to get rid of it without a switch all you have to do it start off with the light not on, turn off the car, unplug the thing, and cut the green and brown wire and connect them to eachother, and leave the harness unplugged?

05-20-2009, 03:56 AM	#17
Taiyaki アキバ製 View User's Garage Drives: 09' White LB, Celica GTS Join Date: Apr 2009 Location: Honolulu, HI Posts: 524	Ok i think ill just put a switch in it.