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Old 03-02-2011, 06:28 AM   #163
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I just put a piece of black tape over the light when I changed the rims. Didn't feel like cutting wires.
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Old 03-02-2011, 06:43 AM   #164
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So just... find the brown wire, cut it, splice the side going OUT from the plug unto the white wire and leave the brown wire going INTO the plug capped?
Correct.
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Old 03-02-2011, 06:55 AM   #165
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Old 05-16-2011, 09:52 PM   #166
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CT Scott, is this this the way it's done in an easy to understand pic?
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Old 05-16-2011, 09:58 PM   #167
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Yes.
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Old 05-16-2011, 10:37 PM   #168
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mmm I should get this done! too much time playing with sound system!

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Old 05-16-2011, 10:40 PM   #169
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Originally Posted by CTScott View Post
Yes.
OK then.
SO, this method does NOT require the the light to be off pre procedure OR that the wheels/sensors to be mounted on or near the car before starting, right? Even if you start out with the light on, it does'nt matter this way.
Is this all true?
Thanks!
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Old 05-17-2011, 06:36 AM   #170
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Originally Posted by auxmike View Post
OK then.
SO, this method does NOT require the the light to be off pre procedure OR that the wheels/sensors to be mounted on or near the car before starting, right? Even if you start out with the light on, it does'nt matter this way.
Is this all true?
Thanks!
That is correct. This mod actually just disables the warning light, which is why the initial state before doing the mod does not matter.

The TPWS is completely independent of all other systems on the car. It actually uses legacy ISO-9141 comm, rather than CAN bus, so the ECM doesn't even have the ability to talk to it.
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Old 05-17-2011, 07:40 AM   #171
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CTScott,

Just wanted to say THANK YOU!

This is the first thing I did when I bought my new Yaris a few months back.

Sure beats taking the inst cluster out and covering the led for the light!

so THANKS AGAIN!

Kevin
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Old 07-31-2011, 06:38 PM   #172
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Quote:
Originally Posted by CTScott View Post
That is correct. This mod actually just disables the warning light, which is why the initial state before doing the mod does not matter.

The TPWS is completely independent of all other systems on the car. It actually uses legacy ISO-9141 comm, rather than CAN bus, so the ECM doesn't even have the ability to talk to it.
So the light is the only onboard indicator of TPMS state? Is there a service tool to interface with the TPMS and read/report status? I suppose I'm basically wondering if there's any advantage to tricking the system into seeing a "good" state vs just disabling the warning light.

Also, is there any identifier such as a part number on the TPWS ECU?

I'm really excited to try this!
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Old 07-31-2011, 07:04 PM   #173
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Originally Posted by zelig View Post
So the light is the only onboard indicator of TPMS state? Is there a service tool to interface with the TPMS and read/report status? I suppose I'm basically wondering if there's any advantage to tricking the system into seeing a "good" state vs just disabling the warning light.

Also, is there any identifier such as a part number on the TPWS ECU?

I'm really excited to try this!
The TPMS is completely independent of the ECM, but the Toyota Techstream tool can communicate with it via the ODB port. The TPMS is the only system on the Yaris that does not communicate over CAN BUS, but rather just communicates via the older ISO-9141 spec. So, there really isn't any advantage to tricking the system instead.
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Old 08-16-2011, 01:29 PM   #174
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info

I did this mod by opening up the tmps module, pulling
the pcb, soldering in 3 wires, cutting one, and using a switch
screwed into the face, as in the pics a few posts earlier
----


One note:

you can easily pull the tpms pcb by using a small flat blade screwdriver on the
small plastic tabs on the gray tpms cover....
there is no need for any tools other than that. the tpms cover pops right
off and the pcb slides right out. super easy.

Last edited by A-Dingo-Ate-My-Baby; 08-16-2011 at 02:00 PM.
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Old 09-12-2011, 08:13 PM   #175
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Thank you, Scott! Did the no switch option mod tonight; bye-bye light that irritated me all weekend driving through VA
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Old 10-09-2011, 09:00 PM   #176
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Thank you for this DIY.
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Old 10-25-2011, 10:02 AM   #177
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Thank you Scott!!!
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Old 01-31-2012, 09:21 PM   #178
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Quote:
Originally Posted by yarisugi View Post
Thanks to them, I was able to make mine with a switch.

I'm putting winters on this week, just did the mod yesterday. I still can't find my digital camera, but the pics/schematics shown are plenty to get it done.
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Old 04-14-2012, 01:10 PM   #179
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I just did this in about ten minutes. You don't need remove the whole black box, remove the connector plug with the wires in it and then carefully pry the clips up on the cover surrounding the connector and remove it. After that the board slides straight out. I just cut one pin lead and soldered it to the one next to it as pictured above. Lights out now! I've been living with that for over four years......
PS It appears the top of the green PC board is conformal coated to protect against moisture and dust. It looks like it's UR vs. the Humiseal acrylic and it's handbrushed on..
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Last edited by auxmike; 04-14-2012 at 01:26 PM.
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Old 08-09-2012, 03:17 PM   #180
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Quote:
Originally Posted by CTScott View Post
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.
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