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

[CTScott]

Originally Posted by white_rice

Is anyone having an issue with the cruise control indicator light? For some reason my LED doesn't light up when I engage the cruise (OEM stalk) all the time. I will press it again to disengage it and then it comes on. It will do that sometimes, and sometimes it won't come on at all when I engage it, and other times it works properly. At first thought, was thinking it might be a short -- but it only happens when the cruise is either engaged or disengaged as opposed to just randomly coming on or off while driving.

The indicator module detects the voltage change when the on/off switch is pressed. If the connections between the ECM and the stalk are not solid, then the voltage drop across them can cause the module to misinterpret the press.

[CTScott]

That looks fine. And, the negative wire goes to a good chassis ground?

[i-trans]

the ground goes to the kick panel on the driver side

[CTScott]

OK. So if you measure between the positive and negative wires, you see 12V with the ignition on, and if you hold the ON/OFF button, it stays at 0V?

Also, the clutch switch is adjusted so that it is fully pressed when the clutch is up?

[i-trans]

yes, 0v when i press the On/Off button.
the clutch switch was ajusted and fully pressed.

[CTScott]

OK. And just to verify:

The top switch is on/off 0 You press that once.

The switch on the right (which becomes the left when installed) is the set button. You get to 25MPH or higher and press that one (having already pressed the top one above).

[i-trans]

exactly!

when i start my car i press the "on" button, when i go faster than 45Km/h i try to press "set" button.

i have try to just press, and keep my finger pressing this button about 3-5sec.

no result!

the clutch control switch has polarity?
the red wire on my ccswitch goes to the blue or the white wire in the fuse box in the driver side of the hood?
or nothing important?

[CTScott]

Originally Posted by i-trans

exactly!

when i start my car i press the "on" button, when i go faster than 45Km/h i try to press "set" button.

i have try to just press, and keep my finger pressing this button about 3-5sec.

no result!

the clutch control switch has polarity?
the red wire on my ccswitch goes to the blue or the white wire in the fuse box in the driver side of the hood?
or nothing important?

The clutch switch is not polarized. The only other thing I can think of is that the switches are poor quality and that rather than making a clean connection when pressed that they "bounce" causing multiple ons and offs with a single press.

[i-trans]

the switchs seem to be okay, no pulse when i push button.

i fugure that the problem are my cc clutch switch...
if my cc clutch switch are not okay, the cc are not functionnal.

i have try with the jumper in the fusebox, and unfortunately i have the same result...

i really don't know what is my cc problem, but i want to resolve that soon!

[CTScott]

Originally Posted by i-trans

the switchs seem to be okay, no pulse when i push button.

i fugure that the problem are my cc clutch switch...
if my cc clutch switch are not okay, the cc are not functionnal.

i have try with the jumper in the fusebox, and unfortunately i have the same result...

i really don't know what is my cc problem, but i want to resolve that soon!

The only way to tell if the switches are bouncing is with an oscilloscope. A voltmeter is too slow.

Also, are you absolutely sure that you are on the correct pin on the ECM?

[i-trans]

yes!
my connector was on the pin 40, i have make a re-check, and it was on the good pin.
For the switch, i have tested at this time with 14 switchs, buy at different store.
i have tested the 4 switchs mode, and the 2 switchs mode.
Actually i have 2 switch untested, i try these 2 switch after the lunch.
If the test are not okay, i pass an order for the stalk, or i pass an order for to momentary switch on an internet store....

[i-trans]

i have try my last switchs, and nothing new...no cruise control!
on my first switch i have 12,35volts.
when i push on, i have 0volts.
on the second switch i have 8,35volts.
when i push on this second switch i have 0volts.

i have 2 resistors ( 1x240 and 1x390 in serie ).

what are the best way to test my cruise control clutch switch?
i suppose that is my problem. (i have try with the jumper but, no result)
i have take a read of this 2 wires (in the fusebox, and i have no read (0volts)
when i push the clutch, i have no read ...)

if i read the white wire behind the puple wire, with the other blue wire, in diagonal i have a read of 12,33 volts.
I suppose that my blue wire behind the purple wire, are no voltage on in.

[CTScott]

That looks fine for a test setup. Snap a pic of your clutch switch wiring at the fuse box.

[i-trans]

this is my clutch switch wiring in the fusebox

[CTScott]

You're in the right place. The blue wire needs to have +12V to it in order for cruise to be enabled.

[i-trans]

the blue wire have +12v when i release the clutch in link with the white wire?

because i don't have any power on my clutch switch.

my wire are clutch switch +/- to fusebox (white and blue wires )

[CTScott]

Originally Posted by i-trans

the blue wire have +12v when i release the clutch in link with the white wire?

because i don't have any power on my clutch switch.

my wire are clutch switch +/- to fusebox (white and blue wires )

Correct - When the clutch is not pressed the blue gets 12V from the white and when it is pressed it opens and the blue has 0V.

[i-trans]

and this cruise control have a fuse anywhere, in case of shortcut ??
what's happen if utilise N.C switch for testing purpose?
in exemple the first switch are N.C (pin 40 to this switch) , and for the second switch i utilize an N.O switch?
the n.c switch when i push on it its "ON" when i repress on it its "off".
and the second switch its "set"