DIY Cruise Control FAQ (2006-2010 Yaris)

[frankmontreal]

got everything installed bud it do not work!

so ran a cable from pin 40 of the ecm to pin 1 of d3

grounded from pin 2 of d3 to a bolt of the column


installed the stalk with the new wire

the horn works fine.

i suspect the ground but its minus 15 celcius in the driveway so i'll
check that out again tommorrow,

anything i should test for if it's not the ground wire,

im reading about that ad4 thiing do i miss something?

2006 canadian yaris HB automatic

[teddy]

Originally Posted by frankmontreal

got everything installed bud it do not work!

so ran a cable from pin 40 of the ecm to pin 1 of d3

grounded from pin 2 of d3 to a bolt of the column


installed the stalk with the new wire

the horn works fine.

i suspect the ground but its minus 15 celcius in the driveway so i'll
check that out again tommorrow,

anything i should test for if it's not the ground wire,

im reading about that ad4 thiing do i miss something?

2006 canadian yaris HB automatic

I don't know what to check, but I definitely did not have to run anything to AD4 that we've heard about. It was direct from D3 to the to the ECM connector A21. Ran the cable through the grommet in the passenger side, under the carpet and eventually up into the steering column. On D3 I wasn't paying attention which pin was ground and which was to the ECM but it worked on the first try so apparently I got it right.

[CTScott]

Originally Posted by frankmontreal

got everything installed bud it do not work!

so ran a cable from pin 40 of the ecm to pin 1 of d3

grounded from pin 2 of d3 to a bolt of the column


installed the stalk with the new wire

the horn works fine.

i suspect the ground but its minus 15 celcius in the driveway so i'll
check that out again tommorrow,

anything i should test for if it's not the ground wire,

im reading about that ad4 thiing do i miss something?

2006 canadian yaris HB automatic

I assume you have an Automatic, since you don't mention installing the clutch switch?

AD4 is the middle connection point. Some years/configurations of the Yaris have the pin from ECM A21-40 to AD4, but then lack the wire from AD4 to D3. In your case, if you had to add A21-40, then AD4 is not of interest.

For testing, if you have a multimeter, I would start with measuring the voltage on pin 1 of D3 with the ignition on - It should measure 12V, indicating that the connection from D3 to the ECM is good.

Next, unplug D3, and with an ohm meter, measure the resistance between pins 1 and 2 on the column. It should measure as open, and then if you hold in the on/off button on the stalk it should go to a dead short.