DIY Cruise Control on 07-08 Yaris (step by step)

[coffiend]

quick question,

im not real familiar with electrical circuits and whatnot, but when adding 2 resistors in a series is it equivalent to the sums of the 2 resistors?

the reason I ask is because i could not find a resistor between 351-426, so i grabbed a 250 and a 150, assuming that together they'd make 370?

or am I just being way too simple minded?

[CTScott]

Originally Posted by coffiend

quick question,

im not real familiar with electrical circuits and whatnot, but when adding 2 resistors in a series is it equivalent to the sums of the 2 resistors?

the reason I ask is because i could not find a resistor between 351-426, so i grabbed a 250 and a 150, assuming that together they'd make 370?

or am I just being way too simple minded?

That's correct. When you connect them in series you sum the resistance (so 250+150 = 400).

[coffiend]

Okay thanks man, much appreciated

[flybabys]

thanks,than ive been waiting for this!but i'm not sure that can be use in my car at china!

[CTScott]

Originally Posted by flybabys

thanks,than ive been waiting for this!but i'm not sure that can be use in my car at china!

Unfortunately, it won't work on your Yaris. Another person from China tried it and verified that your ECM is not setup for cruise control.

[tomlock]

Two questions: 1) To make the A21-40 connection, are you just jamming the wire into the receptacle housing and hoping it makes connection to the corresponding pin on the ECM? Or do you know the part number for the proper crimp terminal to snap into the housing? 2) Why are you running the clutch switch to the engine bay fuse box instead of to C20-56 on the ECM?

[CTScott]

Originally Posted by tomlock

Two questions: 1) To make the A21-40 connection, are you just jamming the wire into the receptacle housing and hoping it makes connection to the corresponding pin on the ECM? Or do you know the part number for the proper crimp terminal to snap into the housing? 2) Why are you running the clutch switch to the engine bay fuse box instead of to C20-56 on the ECM?

I'm not at my desk right now to easily do the search, so if you look at the other two cruise control threads, you'll find my posting with the part number for the correct pin for the ECM connector.

For the clutch switch connection, you can go to either point, although the fuse box connection is easier to get to from the clutch switch.

[1NZYaris1]

What Voltage should i see at pin 40

[CTScott]

Originally Posted by 1NZYaris1

What Voltage should i see at pin 40

If your ECM supports cruise, pin 40 should measure 12 V with the ignition on, and nothing connected to the pin (other than your voltmeter).

[CTScott]

Originally Posted by yaris07hb

Is it possible that my failure to follow instructions, not jumping the clutch switch terminals, and attempting to activate the cruise has affected my ECM? I find nothing out of place, nor did I disturb anything other than the ground lug on the battery and the ECM connector to install the wire at Pin 40.

Has anyone else had a rough idle during or after performing this mod? Is it a super-coincidence that I now must perform a forum search on rough idle, and then go clean my MAS or something else?

Thanks...

Forgetting the clutch switch or bypass of it wouldn't cause an issue, other than the cruise not kicking on.

Your rough idle is probably due to having pulled the connector off of the ECM. Connector A21 carries power to the ECM, so when you pull it, you reset the short term data. Drive it for a couple of days and it should cure itself.

[WolfWings]

Originally Posted by yaris07hb

I still have a very low, very rough idle. This was not the case before yesterday.

Same thing happened here when I first did the mod to install the factory stalk on my '07 MT LB, CTScott's right: Give it a full tank of gas to re-learn things, it'll behave itself again.

[Smsimpson]

So I need some help with the actual routing of the wires...

I have an 08 Sedan MT. I have gone with the 4 button method and Installed them on a project box from the Shack ( I don't want to drill my dash because i want to eventually get a stalk). I'm stowing it in the Drivers side mini glove box essentially the same as mounting on the power mirror panel. I have run the negative lead to the Driver's side door sill to the ground bolt. My issue is how did you guys route this cable over to the passenger side floor (to access the grommet under the carpet)? any pictures of this process would be really nice. Also some help with the clutch switch routing would be nice too.

Thanks guys.... I'm and Audio Engineer so the soldering and electrical stuff is pretty easy for me, but I have never really worked on cars. So I need that help.

[1NZYaris1]

I have a factory Cruise stalk if anyone is interested

[hirstmusic]

Hey guys,

My brother helped me install the DIY cruise control today, and it works great! Tonight however, I was testing the cruise again and randomly the P/S (Power Steering) indicator came on. It may have come on after one of the following, but I'm not sure exactly what cause this... I tried to recreate the problem. It might have come on because...

1) I accidentally held "Cancel" instead of "Set" - would that cause a problem?
2) I tried to "Set" the cruise below 25 mph, which I know isn't supported, wondering if that was the problem and the light came on then.

Has anyone experienced something similar with the DIY Cruise Control and the Power Steering indicator? If so, what was the issue you found with it?

Any help would be really appreciated... I just want to make sure nothing is going to blow up or melt down or anything :-) Thanks!

[CTScott]

Originally Posted by hirstmusic

Hey guys,

My brother helped me install the DIY cruise control today, and it works great! Tonight however, I was testing the cruise again and randomly the P/S (Power Steering) indicator came on. It may have come on after one of the following, but I'm not sure exactly what cause this... I tried to recreate the problem. It might have come on because...

1) I accidentally held "Cancel" instead of "Set" - would that cause a problem?
2) I tried to "Set" the cruise below 25 mph, which I know isn't supported, wondering if that was the problem and the light came on then.

Has anyone experienced something similar with the DIY Cruise Control and the Power Steering indicator? If so, what was the issue you found with it?

Any help would be really appreciated... I just want to make sure nothing is going to blow up or melt down or anything :-) Thanks!

Check the power steering ECU (located directly above the steering column). Depending on how you pulled your wires through, you may have loosened one of the connectors. Neither of the two events you mentioned would cause an issue.

[upgradedyaris]

Originally Posted by 1NZYaris1

I have a factory Cruise stalk if anyone is interested

Price on this? Would this work with my car?

Thanks
Duane

[yarstar]

You guys are FREAKING AMAZING!

I almost bought the Rostra CC back in the summer because I was so sick of trips with my foot cramping up.

Now I'm so glad I didn't. Thanks for coming up with this and sharing your knowledge.

[cynsofdm]

Wow this is awesome. It sounds easy enough that I could do it knowing nothing about cars or electronics. I was searching for this though because I am moving to Gainesville, fl from Atlanta, Ga tomorrow. I had to make the trip a couple days ago and my leg and back were killing me. I was hoping to find a way I could pull something off in a couple of hours. You think it's possible? I have a couple of guys familiar with cars and electrical stuff that are coming to help me move tomorrow...

The other thing was I really liked the "test" install Yaris07hb did, because then I could worry about mounting it later. Or possibly something even simpler... installing it in a slip of cardboard... I have tons of cardboard.

Also is the only worry with modifying the remote possibility of voiding a warranty? I bought my '08 HB used, and I don't have a warranty, at least that I know of... it's my first nice new to me car.