TRC/VSC switch?

[Stiv]

I just read somewhere that Scion xD has on/off switch for TRC/VSC. It's located in on one of those 4 slots between shifter and hand brake.
If the motor is the same, same as some other stuff, is there by any chance some similarity in electrical wiring?
Maybe we could just make some kind of plug-n-play switch for our TS? :iono:
There could be a socket just waiting to be plugged :biggrin:
What do you think?

[Stiv]

Lucky you :)
I still have to do that brake - hand brake stuff.

Anybody have Yaris 2010 wiring diagram? I am electrical technician so it would help a bit :)

[Stiv]

Ok, I'll ask him. But if nothing else, you could pop that cover and take a look where the wiring goes. Maybe take a picture or two of connectors and wires? :)

[CTScott]

I have the 2010 EWDs. I'll PM you the VSC/TRAC one. It looks like it would be very easy to just wire up your own switch.

[tcpty]

Great News!!! When you decipher, please count me in as interested too so please post the solution if any !

[Stiv]

Sure thing mate. If this works I'll write a DIY.
In the meantime I looked at the wiring in my TS and there is no connector for this switch. So for now it's not plug and play but there must be at least an open pin on some connector.
I'll take a look at the EWD's CTScott sent me today.

[CTScott]

Take a look at this thread, starting with post#13:

http://www.yarisworld.com/forums/showthread.php?t=20621

When the 2010's came out with it in the US this year (other markets had it earlier than us), I did a quick writeup. You simply wire a switch to bring the input to ground and press and release to turn VSC off, or press and hold to turn TRAC off.

It looks like the wiring is only there if the switch is an option (or standard) for your market. Also, for the US (where the switch is not an option), the instrument cluster does not have the VSC OFF or TRAC OFF lights.

Also, take a look at this thread for info on how to turn it off, without doing any wiring:

http://www.yarisworld.com/forums/showthread.php?t=23651&highlight=vsc

[Stiv]

Take a look at this thread, starting with post#13:

http://www.yarisworld.com/forums/showthread.php?t=20621

When the 2010's came out with it in the US this year (other markets had it earlier than us), I did a quick writeup. You simply wire a switch to bring the input to ground and press and release to turn VSC off, or press and hold to turn TRAC off.

It looks like the wiring is only there if the switch is an option (or standard) for your market. Also, for the US (where the switch is not an option), the instrument cluster does not have the VSC OFF or TRAC OFF lights.


This sounds promising. I bet the TRC/VSC in new Yaris is taken from earlier TS models.

But how on earth should I reach that A30 connector from engine bay. I have no place to go to take a look from underneath.
By that picture you provided, I'm not sure it's even visible without taking at least the battery out.



Also, take a look at this thread for info on how to turn it off, without doing any wiring:

http://www.yarisworld.com/forums/showthread.php?t=23651&highlight=vsc

Yeah, I got tired of doing tis for past two years. That's why I want a nice little button :)

[CTScott]

This sounds promising. I bet the TRC/VSC in new Yaris is taken from earlier TS models.

But how on earth should I reach that A30 connector from engine bay. I have no place to go to take a look from underneath.
By that picture you provided, I'm not sure it's even visible without taking at least the battery out.



It's definitely not an easy place to get to. And, unfortunately, the only place it routes through is one of the connectors at the top of the dash, which would require removing the dash to get to. I have a feeling that you will find that the pin on connector A30 is empty on cars that don't have the switch. So, you would need to add the pin (Toyota Part Number: 82998-24250)

[Stiv]

Ok. So there is another connector behind the dash, but it's a good guess that it's not wired. So again, it would require to get to that connector from the engine bay and run a wire to the cabin, right? Or did i got my connectors mixed up :)

[CTScott]

Ok. So there is another connector behind the dash, but it's a good guess that it's not wired. So again, it would require to get to that connector from the engine bay and run a wire to the cabin, right? Or did i got my connectors mixed up :)

That's correct.

[Stiv]

Well then, this will have to wait until I find a way to get to that connector.
Or if someone else if willing to take a look at that A30 connector, and take a picture or two. Maybe even try to ground it with a piece of wire to do a quick test :)

There is just one thing that is bugging me in post http://www.yarisworld.com/forums/showpost.php?p=398122&postcount=23
"automatic TRAC on...if vehicle speed increases"
So what. We disable TRAC and push the pedal in "drag race" and it reactivates? That's just wrong :(

[127.0.0.1]

Well then, this will have to wait until I find a way to get to that connector.
Or if someone else if willing to take a look at that A30 connector, and take a picture or two. Maybe even try to ground it with a piece of wire to do a quick test :)

There is just one thing that is bugging me in post http://www.yarisworld.com/forums/showpost.php?p=398122&postcount=23
"automatic TRAC on...if vehicle speed increases"
So what. We disable TRAC and push the pedal in "drag race" and it reactivates? That's just wrong :(

if you turn off TRAC with the handbrake/footbrake method it will not turn on automagically. ever.

if you do it with a switch, it will. if you are drag racing and use a switch,
it will reactivate well after launch you should be past the point of spinning anyway

[CTScott]

That post has some contradictory info, which I couldn't find in the section of the manual that I have:

"automatic reactivation of TRAC and VSC
turn engine off

automatic TRAC on...if vehicle speed increases

automatic TRAC and VSC activation
they will not reactivate when speed increases"

[127.0.0.1]

That post has some contradictory info, which I couldn't find in the section of the manual that I have:

"automatic reactivation of TRAC and VSC
turn engine off

automatic TRAC on...if vehicle speed increases

automatic TRAC and VSC activation
they will not reactivate when speed increases"

straight from techinfo.toyota.com

look for the conjunction 'AND' in my post.

TRAC will activate automatically

TRAC -and- VSC will not

[CTScott]

Got it. I was thinking that quick press was VSC off, not TRAC off.

OK, so in that case, as long as one does the long press with the switch, there are no worries about TRAC being re-enabled on acceleration.

[Stiv]

I looked at Brake Control.pdf on Etimago's pages and found that one has to remove battery and battery holder to get to the brake actuator (page BC-87 and BC-88).
Now, on page BC-88, there is a sketch of brake actuator connector, and it looks different from what I expected. Am I looking at the right connector or is there another one for vehicles with VSC?

[CTScott]

The connector on the "Skid Control ECU" changes from connector A15 to connector A30 for VSC equipped cars. The connector is in the same general place, but is slightly different (so one can't be plugged into the other).

[Stiv]

Great, thanks mate. That's the information I was missing.
So now we wait for a lovely sunny day for me to get my hands dirty in the engine bay :)
I'll keep you all posted

[127.0.0.1]

Got it. I was thinking that quick press was VSC off, not TRAC off.

OK, so in that case, as long as one does the long press with the switch, there are no worries about TRAC being re-enabled on acceleration.


TRAC, if turned off by the mild button press, will reactivate automatically

VSC, if turned off by the hard button press, will NOT reactivate automatically

TRAC, if turned off by the feet and handbrake, will NOT reactivate automatically

that is what techinfo.toyota.com sez about 2010 yaris

[CTScott]

Great, thanks mate. That's the information I was missing.
So now we wait for a lovely sunny day for me to get my hands dirty in the engine bay :)
I'll keep you all posted

Sounds good. You owe us some pictures of your Yaris as well. I enjoy seeing them in their native habitats all over the world.

[knowmercy]

Makes me curious about the 2009 Yaris models.... going to have to do some research.

[CTScott]

Makes me curious about the 2009 Yaris models.... going to have to do some research.

For US Yaris, VSC and TRAC weren't available in 2009.

[DerFlosser]

Sounds good. You owe us some pictures of your Yaris as well. I enjoy seeing them in their native habitats all over the world.

:thumbsup:

[yaris2010RS]

so if u were to dissable VSC and TRAC (i have the switch, so i know the long hold) they will never turn on again unless the car is restarted or the switch is depressed again. and the car has no other traction control functions. i'm looking to drift and such but found with only TRAC off the independent braking still was applied (since i found out about the long hold for VSC it hasn't snowed again so haven't been able to test it)

[127.0.0.1]

so if u were to dissable VSC and TRAC (i have the switch, so i know the long hold) they will never turn on again unless the car is restarted or the switch is depressed again. and the car has no other traction control functions. i'm looking to drift and such but found with only TRAC off the independent braking still was applied (since i found out about the long hold for VSC it hasn't snowed again so haven't been able to test it)

so TRAC doesn't come back on by itself, as vehicle speed increases...if you previously disabled only TRAC and not disabled VSC also ?

techinfo says trac will come back on, if only trac was turned off

[Stiv]

Ok, so I took a look at the brake actuator yesterday, a found that it's quite accessible. But it was late last night and I wasn't feel like taking out the battery. The connector really looks like A30 (quite big and without round corners like A15).
I'll try to do that dirty test with a wire during this weekend.

[Kongo-Otto]

Is it possible for someone who got the switch from factory to make a picture of its back? I found some connectors under my handbrake lever and want to know if maybe i can attach the TRC/VSC switch to one of them.

[CTScott]

Is it possible for someone who got the switch from factory to make a picture of its back? I found some connectors under my handbrake lever and want to know if maybe i can attach the TRC/VSC switch to one of them.

Here's what the 2010 service manual shows of the connector on the bottom of the VSC off switch:

31485

[Kongo-Otto]

Thank you but no luck for me. I found this little guy but have no clue what it is used for.

http://i46.tinypic.com/14bj76u.jpg

[CTScott]

Thank you but no luck for me. I found this little guy but have no clue what it is used for.



Do you have keyless entry? That connector looks like the one for the keyless entry receiver.

[Kongo-Otto]

No but maybe its prewired. "Executive" models have keyless entry here.