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09-26-2012, 11:38 PM | #1 |
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Drives: 2012 and 2013! Join Date: Aug 2012
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2012 Fog relay
I cant seem to find the fog relay plug.
Remember his is a 2012, all previous diagrams dont mean squat!! BTW, my 2012 already has a fog light loom under the hood!!
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09-27-2012, 06:28 AM | #2 |
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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). D106.jpg
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09-27-2012, 11:00 AM | #3 | |
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Thank you, I was getting that impression from reading the Prius C forums. The fog harness behind the bumper is already there, as is the fog fuse. I do not have the OEM alarm, so brown to green? What wire is the parking light, if I cheese to not use low beam? Is the illustration pin side, or wire side? Again, thank you!
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09-27-2012, 11:14 AM | #4 | |
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If you have neither alarm nor DRLs - Green to Green. The connector illustration is looking at the pin side of the connector. For the parking light turn on, it is a bit more complicated for the 2012, as for the ones with DRLs, that functionality is built into the body ECU, so it will be completely different for DRL vs. non-DRL Yaris. I would start with seeing if it works at all on a non-factory equipped car.
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09-27-2012, 11:18 AM | #5 | |
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Got it, will let you know tonight. Thanks again!
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01-16-2013, 04:01 PM | #6 | |
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01-16-2013, 04:05 PM | #7 |
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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).
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01-16-2013, 10:00 PM | #8 | |
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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.
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03-22-2013, 09:56 PM | #9 | |
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03-22-2013, 11:04 PM | #10 |
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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).
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01-12-2016, 12:21 PM | #11 | |
Drives: Toyota Yaris 2014 LE Join Date: Dec 2014
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01-12-2016, 06:34 PM | #12 | |
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09-27-2012, 12:08 PM | #13 |
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Pins 3&4 are violet, and green.
Jumping them does not turn the fogs on. Using DVOM shows no voltage coming from either wire when turning on the headlights.
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09-27-2012, 12:16 PM | #14 |
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OK. DISREGARD my last post.
I forgot to turn on the ignition DOOOOHHH! Jumping the purple and green wires at 3&4 made the fogs go on!! The light on the dash also works!! Time to get some taps, and wire the switch. Now taking this one step further, how do I make it work with park, low, high. CT Scott, thank you for the help, also in advance!!
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09-27-2012, 03:31 PM | #15 | |
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09-27-2012, 05:46 PM | #16 |
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No DRLs.
Also now using a PIAA switch, as the cheap Chinese Toyota looking switch would not allow the fogs to turn off. New switch is a 3 wire, internal lighting, when on. It also allows the dash icon to turn on!!
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09-27-2012, 09:12 PM | #17 | |
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I just noticed that for both the DRL and non-DRL Yaris the fog relay coil is tied directly to the body ECU internally in such a way that it prevents the fogs from turning on except when it decides it is OK to. You would have to either do some surgery on the body ECU or use an external relay and rewire the fogs to it to override that behavior.
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09-27-2012, 09:25 PM | #18 | |
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The Chinese switch was a four, with isolated illumination. Wouldn't allow the fogs to turn off!! The three wire works as expected, Ill get another 4 wire to avoid future issues. Thanks a bunch.
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