DIY Cruise Control on 07-08 Yaris (step by step) - Page 20 - Toyota Yaris Forums

scape · 12-09-2011, 03:28 PM

quick question on those momentary switches: I found a few at radioshack but they are low-amp rated (like .5A).. I noticed the referenced digikey switches are around 3 amps. what's the max rated amperage I should shoot for?

i found a few packs of resistors at the local radioshack, but none at 240. looks like i'll be soldering them together to make 240. they're rated at 5% tolerance, if combining them would the tolerance inherently go up?

CTScott · 12-09-2011, 03:45 PM

Quote:

Originally Posted by scape

quick question on those momentary switches: I found a few at radioshack but they are low-amp rated (like .5A).. I noticed the referenced digikey switches are around 3 amps. what's the max rated amperage I should shoot for?

i found a few packs of resistors at the local radioshack, but none at 240. looks like i'll be soldering them together to make 240. they're rated at 5% tolerance, if combining them would the tolerance inherently go up?

Any momentary switch is fine. You are switching an analog input to a microcontroller, so the current is negligible.

For the resistors the tolerance means how far they can be off, so a 100 ohm, 5% can be 95 to 105 ohms. Since it is a plus or minus rating, chaining them together means that they can cancel each other out, or add to the percentage off in either direction. If you have a multimeter, you can measure the actual resistance of each.

scape · 12-09-2011, 04:01 PM

Quote:

Originally Posted by CTScott

Any momentary switch is fine. You are switching an analog input to a microcontroller, so the current is negligible.

For the resistors the tolerance means how far they can be off, so a 100 ohm, 5% can be 95 to 105 ohms. Since it is a plus or minus rating, chaining them together means that they can cancel each other out, or add to the percentage off in either direction. If you have a multimeter, you can measure the actual resistance of each.

thx for the quick reply. what then would be the permitted resistance ratings to get this to work? I plan on just using 2 switches, listed is 240 and 390-- how close should i be to that?

scape · 12-09-2011, 04:10 PM

actually looking back at the wiring for two buttons, one single resistor of 630ohm seems like it would work-- between the two buttons on positive; still not sure about the set-cc pushbutton resistances range though

CTScott · 12-09-2011, 04:11 PM

Quote:

Originally Posted by scape

thx for the quick reply. what then would be the permitted resistance ratings to get this to work? I plan on just using 2 switches, listed is 240 and 390-- how close should i be to that?

You can use any value within these ranges:
216 to 264 ohms for one between resume and on/off
351 to 426 ohms for the one between set and resume
819 to 1001 ohms for the one between set and cancel

For the two button method, a single resistor 567 to 690 ohms can replace the 240 and 390 ohm resistors.

For current rating of the resistors, like the switches, it really doesn't matter, so 1/8 W, 1/4 W, 1/2 W, etc. are all fine.

scape · 12-09-2011, 04:49 PM

ah ok great, that helps big time in finding a proper resistor. why is it necessary to use the different clutch switch assembly, can the original clutch start-switch assembly be tapped in to?

CTScott · 12-09-2011, 04:54 PM

Quote:

Originally Posted by scape

ah ok great, that helps big time in finding a proper resistor. why is it necessary to use the different clutch switch assembly, can the original clutch start-switch assembly be tapped in to?

No, they are two different switch functions. The existing one detects that the pedal is fully pressed for starting and the CC one detects the initial press of the clutch pedal.

spectra · 12-19-2011, 02:11 AM

to do this do I need to buy a new terminal pin for the ecm? where can I get this?

CTScott · 12-19-2011, 09:32 AM

Quote:

Originally Posted by spectra

to do this do I need to buy a new terminal pin for the ecm? where can I get this?

I have the ECM pins available.

spectra · 12-23-2011, 04:57 PM

thanks so much! I got everything in and the test run went perfectly!

CTScott · 12-23-2011, 09:25 PM

Quote:

Originally Posted by spectra

thanks so much! I got everything in and the test run went perfectly!

Nice! And, in plenty of time for your road trip.

spectra · 12-23-2011, 09:59 PM

Yup! even had time to clean the car top to bottom

:-)

yaryarbing · 09-01-2012, 01:40 PM

Just installed the two switch DIY cruise control on my '07 Yaris Sedan. Can't believe it works! Not that I had any doubts in the DIY instructions. I have zero experience in electronics. I just bought the parts (<$10!), installed as instructed, and I now have cruise control!

Thanks so much for this thread and instructions. I am a traveling salesman with a four state territory. The cruise will make my travels SO much easier

-Yaryarbing

the beagle · 12-31-2011, 11:04 PM

After reading the entire thread on DIY cruise, I installed a $9.73 cruise on my son's 08 liftback, thanks to all of you for your perseverance and innovation. We ran the wires to the console between the seats. The two button controls are partially covered by the brake handle. A very clean install if I do say so myself.
CTScott, how can I get one of those ECM terminal pins?

CTScott · 01-01-2012, 04:52 PM

Quote:

Originally Posted by the beagle

After reading the entire thread on DIY cruise, I installed a $9.73 cruise on my son's 08 liftback, thanks to all of you for your perseverance and innovation. We ran the wires to the console between the seats. The two button controls are partially covered by the brake handle. A very clean install if I do say so myself.
CTScott, how can I get one of those ECM terminal pins?

PMed with payment info. I have the pins available.

bad · 01-07-2012, 01:15 PM

I've used the CTScott cruise control system and procedure. works great. I have little experience working on cars. successful install.

bad · 01-07-2012, 01:20 PM

oh but i should mention you'll need a variety of butt splices and extra wire ... i wish i could remember the gauges but its all around 16 to 22. depening on what wire you use to ground you might need a different gauge lug for that too.

menz · 06-13-2012, 08:59 AM

I am from Egypt (middle east). I have seen this DIY years ago but never had the guts to do it. I am a noob when it comes to car mechanics and also afraid of electronics :D. I don't know if my car has cruise function. To summarize, I need to check if PIN 40 has 12 volts when ignition on. Wish me luck everybody. I hope that the car has the function so I can do it, my 300 kms daily route to work would be so much better. I think that toyota must have installed it in all the cars not specific to a certain segment. When I first bought the car it had no rear speakers and when I bought the speakers and during installation, I found out that all the wiring is done and all I have to do it place the speakers and that was it. Do I need to remove the steering wheel to get to the D3 connector??? :d

09-01-2012, 01:40 PM	#13
yaryarbing Budget Buster View User's Garage Drives: 2007 Polar White Sedan Join Date: Apr 2011 Location: Maryland Posts: 9	It Works! Just installed the two switch DIY cruise control on my '07 Yaris Sedan. Can't believe it works! Not that I had any doubts in the DIY instructions. I have zero experience in electronics. I just bought the parts (<$10!), installed as instructed, and I now have cruise control! Thanks so much for this thread and instructions. I am a traveling salesman with a four state territory. The cruise will make my travels SO much easier -Yaryarbing __________________

12-31-2011, 11:04 PM	#14
the beagle I've made a post! Drives: '08 Liftback Join Date: Dec 2011 Location: N Central, IA Posts: 1	Cruise for Christmas! After reading the entire thread on DIY cruise, I installed a $9.73 cruise on my son's 08 liftback, thanks to all of you for your perseverance and innovation. We ran the wires to the console between the seats. The two button controls are partially covered by the brake handle. A very clean install if I do say so myself. CTScott, how can I get one of those ECM terminal pins?

01-07-2012, 01:15 PM	#16
bad Winterizing Drives: 2010 Toyota Yaris Hatchback Join Date: Oct 2011 Location: Pennsylvania Posts: 157	I've used the CTScott cruise control system and procedure. works great. I have little experience working on cars. successful install. __________________ 33.7 mpg in PA

01-07-2012, 01:20 PM	#17
bad Winterizing Drives: 2010 Toyota Yaris Hatchback Join Date: Oct 2011 Location: Pennsylvania Posts: 157	oh but i should mention you'll need a variety of butt splices and extra wire ... i wish i could remember the gauges but its all around 16 to 22. depening on what wire you use to ground you might need a different gauge lug for that too. __________________ 33.7 mpg in PA

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12-09-2011, 03:28 PM	#1
scape View User's Garage Drives: 2007 Yaris Hatchback Join Date: Jul 2007 Location: Beaufort, South Carolina Posts: 388	quick question on those momentary switches: I found a few at radioshack but they are low-amp rated (like .5A).. I noticed the referenced digikey switches are around 3 amps. what's the max rated amperage I should shoot for? i found a few packs of resistors at the local radioshack, but none at 240. looks like i'll be soldering them together to make 240. they're rated at 5% tolerance, if combining them would the tolerance inherently go up?

12-09-2011, 04:10 PM	#4
scape View User's Garage Drives: 2007 Yaris Hatchback Join Date: Jul 2007 Location: Beaufort, South Carolina Posts: 388	actually looking back at the wiring for two buttons, one single resistor of 630ohm seems like it would work-- between the two buttons on positive; still not sure about the set-cc pushbutton resistances range though

12-09-2011, 04:49 PM	#6
scape View User's Garage Drives: 2007 Yaris Hatchback Join Date: Jul 2007 Location: Beaufort, South Carolina Posts: 388	ah ok great, that helps big time in finding a proper resistor. why is it necessary to use the different clutch switch assembly, can the original clutch start-switch assembly be tapped in to?

12-19-2011, 02:11 AM	#8
spectra View User's Garage Drives: 2007 Yaris Join Date: Dec 2011 Location: Los Angeles Posts: 17	to do this do I need to buy a new terminal pin for the ecm? where can I get this?

12-23-2011, 04:57 PM	#10
spectra View User's Garage Drives: 2007 Yaris Join Date: Dec 2011 Location: Los Angeles Posts: 17	thanks so much! I got everything in and the test run went perfectly!

12-23-2011, 09:59 PM	#12
spectra View User's Garage Drives: 2007 Yaris Join Date: Dec 2011 Location: Los Angeles Posts: 17	Yup! even had time to clean the car top to bottom :-)

06-13-2012, 08:59 AM	#18
menz Drives: yairs blue 2007 automatic 1.3 Join Date: Apr 2007 Location: Egypt Posts: 24	I am from Egypt (middle east). I have seen this DIY years ago but never had the guts to do it. I am a noob when it comes to car mechanics and also afraid of electronics :D. I don't know if my car has cruise function. To summarize, I need to check if PIN 40 has 12 volts when ignition on. Wish me luck everybody. I hope that the car has the function so I can do it, my 300 kms daily route to work would be so much better. I think that toyota must have installed it in all the cars not specific to a certain segment. When I first bought the car it had no rear speakers and when I bought the speakers and during installation, I found out that all the wiring is done and all I have to do it place the speakers and that was it. Do I need to remove the steering wheel to get to the D3 connector??? :d