2012 Fog relay

[06yarishb]

Originally Posted by CTScott

There is none on the 2012. The fog light relay is built into the body ECU.

To see if it is enabled on your car, you can jump pin 3 to pin 4 on the headlight switch connector D106. Pin 3 will be brown or green (depending on if you have the OEM alarm) and Pin 4 will be green.

Jump those wires and have the ignition on and the headlight switch in the low beam position. If the fogs don't light then the relay is not in there. For the 2nd gens for instance the integrated relay for the power windows and locks is not present on cars that were not built with them (and there are different part number for the body ECU).



Attachment 48579

Sorry stupid question: what do you mean by jump pin 3 to pin 4? Is that mean you connect the pin 3 to pin 4? just got a 2012 yaris hb le and want to add the fog light on. Thanks

[CTScott]

Originally Posted by 06yarishb

Sorry stupid question: what do you mean by jump pin 3 to pin 4? Is that mean you connect the pin 3 to pin 4? just got a 2012 yaris hb le and want to add the fog light on. Thanks

With the 2012's to add fogs you simply install and connect the foglights on the front bumper and then install a switch that connects the wires in pins 3 and 4 together (i.e. jumps one wire to the other).

[Absolutely Red 12]

Originally Posted by 06yarishb

Sorry stupid question: what do you mean by jump pin 3 to pin 4? Is that mean you connect the pin 3 to pin 4? just got a 2012 yaris hb le and want to add the fog light on. Thanks

Remove the lower steering column cover.
Locate the connector shown in my picutre.
Tap the fog switch wires, one to the violet, and the other to the green wire.
The two by themselves.

You can alternatively not use a switch, and jump the two wires, they will go on, and stay on when the headlights are turned on.

[oohcory]

Originally Posted by Absolutely Red 12

Remove the lower steering column cover.
Locate the connector shown in my picutre.
Tap the fog switch wires, one to the violet, and the other to the green wire.
The two by themselves.

You can alternatively not use a switch, and jump the two wires, they will go on, and stay on when the headlights are turned on.

I for the life of me cannot find this. All that's below my steering column is an airbag? I'm a noob, little help please?

[CTScott]

Originally Posted by oohcory

I for the life of me cannot find this. All that's below my steering column is an airbag? I'm a noob, little help please?

You are looking too far down. You need to remove the lower steering column cover to find that connector (which is at the base of the headlight switch).

[oohcory]

Originally Posted by CTScott

You are looking too far down. You need to remove the lower steering column cover to find that connector (which is at the base of the headlight switch).

Oh ok, is there a trick to taking it off? Or is it just the three screws and pop her off

[CTScott]

Originally Posted by oohcory

Oh ok, is there a trick to taking it off? Or is it just the three screws and pop her off

Just the three screws and squeeze it by the seam to separate it.

[oohcory]

Originally Posted by CTScott

Just the three screws and squeeze it by the seam to separate it.

Thanks! I jumped it, everything's golden!

[Eforno]

Originally Posted by Absolutely Red 12

Remove the lower steering column cover.
Locate the connector shown in my picutre.
Tap the fog switch wires, one to the violet, and the other to the green wire.
The two by themselves.

You can alternatively not use a switch, and jump the two wires, they will go on, and stay on when the headlights are turned on.

I tried PMing you but it didn't work for some reason; I see no record of it in my sent inbox. I've read this entire thread and I am still confused with how the wiring works. How exactly do you jump a wire? Scott's definition is to connect it with the switch, but how do I jump it without anything, as to test if the relay is there or what not. All I can think of when it comes to jumping a wire to to slice it open and then twisting it together.

[CTScott]

Originally Posted by Eforno

I tried PMing you but it didn't work for some reason; I see no record of it in my sent inbox. I've read this entire thread and I am still confused with how the wiring works. How exactly do you jump a wire? Scott's definition is to connect it with the switch, but how do I jump it without anything, as to test if the relay is there or what not. All I can think of when it comes to jumping a wire to to slice it open and then twisting it together.

Tap Splice connectors are the easiest way. They bite through the insulation on two pieces of wire to make the connection:

[Eforno]

Originally Posted by CTScott

Tap Splice connectors are the easiest way. They bite through the insulation on two pieces of wire to make the connection:

I thought of scotchlocks when Absolutely Red 12 mentioned tapping the wires from the fog switch to Pin 3 and 4; I was just confused about what it meant to "jump" a wire, because I wasn't expecting to have to splice into any wires just to "check/test" them. Instead, I thought using something like an alligator clip wire to clip onto each pin would work; because if I jumped 2 wires with a tap and they happened to be the wrong ones, I'll end up having to seal the plastic insulation of each wire, as caused by the removal of the tap. (I don't even know if using alligator clips to jump wires would work. I made that whole scenario up in my head w/o any electrical/wiring knowledge)


So just to clarify, to jump wires that are inserted into a connector, I should pull one of the wires w/ the pin out, cut the pin off, and then t-tap it to the pin wire that is still in the connector?

Another thing I can't really comprehend is, how is it that purple and green wire in Absolutely Red 12's picture pin 3 & 4, respectively, if when the connector is oriented like this: .

And as for the fog light switch, can I just tap any of the two of the four switch wires to the purple or green pin wires? What do I do with the remaining two wires from the fog light switch? Fuse tap one of the wire to dash illumination, and ground the other wire?

I sorry I have so many questions, and I know many may have already been answered in other threads, but thank you so much for always answering CTScott