Trying to modify the way my lights come on... electrical help appreciated! - Toyota Nation Forum : Toyota Car and Truck Forums

MrSo0h0o · 02-12-2009, 06:17 PM

Hey guys, long story short, I have already done the independent fog light mod and they are fully operational in any stalk position, but I would like to be able to have the fogs on with the side marker lights and tail lights on, without the DRL's coming on. So here is my question:

Based on these wiring diagrams,

would I be able to essentially perform the same modification I did on the fog light relay on the tail light relay? (bend pin 1 out and wire it to a 12v switched source of my choice)

If this seems feasible, will the DRL's come on when the tail light relay is powered on? Does anyone see a way around the DRL's not coming on with the tail lights?

carlo$ · 02-12-2009, 06:59 PM

sorry, your question is too complex for me.

***Punks_Not_Dead5*** · 02-12-2009, 09:10 PM

I get what you're saying...sounds cool..would like to know how you do it(if you get an answer) And i hope you do!

MrSo0h0o · 02-12-2009, 11:01 PM

Quote:

Originally Posted by djkor

What light's come on with the DRL and are they always on with the car? Sorry, this feature is not something we have around here in Aus.

I can kinda get what you want to do there and from the sounds of it, would most certainly be possible. You need to consider though whether you want you DRL to still work or be completely disabled?

The way I see it is that you simply need a three way switch for you fog light relay and have on pole of the switch to a constant positive and the other pole tapped into the tail light relay. This way when the switch is in the neutral position your fog lights are off; when it is in the 1st ON position you will have your fog lights forced on; and in the second ON position your fog lights are triggered by the tail lights.

The above idea is completely independent of the DRL. I would need more information about the workings of the DRL to get a better idea on the best way to have all this.

DRL stands for daytime running lights. They are basically the high beams on running at a lower wattage. Some people find it a nuisance, like me.

As for the modification, from what I can gather, the DRL is tied into everything. If you look at the gen 5.5 manual here: http://camrystuff.com/index.php?page=Gen55_Manuals , you can find the wiring diagrams. I cannot find a way to work around the DRL system (ie: removing fuses without the high beam function not working)

To comment on your idea about the three way switch, I forgot to mention I want to be able to do all this with the OEM stalk. If you could figure out a way to work around the DRL system, I would be in your debt for... well at least a week or so lol...

Off topic, are you an EE or deal with electrical wiring?

camryguru · 02-13-2009, 01:13 AM

from what i understand, basically you want to disable drl? correct? and going between pages 120 and 121 of the diagram from the link you should be able to remove wire labeled R-L and connect it to wire labeled R-W, with the 10 amp fuse. it should disable drl's. take a look tell me what u think. its late. im tired. good luck.

MrSo0h0o · 02-13-2009, 09:06 AM

ok i looked at the diagram and I think I understand what you mean..

basically I have to splice in that diode into the R-W wire? This R-W wire, does that mean red-white wire? Also, from the way it looks, the wire leads to the right hand high beam bulb directly, right? What will the diode actually do?

I appreciate your help!

camryguru · 02-13-2009, 10:03 AM

yep, he's got it right. the diode only allows current to flow in one direction (anode to cathode) (it goes the way the arrow points). in the drl circuit the high beam bulbs are wired in series which cuts the voltage to each in half making them dim. that diode prevents the current from getting to a ground thus preventing the lights from working. but turn on high beam and the current is allowed to flow thru the number 3 relay giving power to the Right high beam, and the Left already has power thru number 2 relay. and at the same time when you turn on the high beam you close relay number 4 giving both high beam bulbs a path to ground.

MrSo0h0o · 02-13-2009, 10:52 AM

Do you know where I can purchase the required diode? I did a google search and nothing really comes up..

Also, I will just have to cut the R-W(red white?) wire that is part of the bulb wire harness and solder in the diode, right?

LoudCamry · 02-13-2009, 11:56 AM

go to a shop that sell electronic component like radioshack, diode dun cost much.

MrSo0h0o · 02-13-2009, 12:01 PM

Quote:

Originally Posted by LoudCamry

go to a shop that sell electronic component like radioshack, diode dun cost much.

i tried the radioshack website and the one that djkor pointed me to was not on there..

LoudCamry · 02-13-2009, 12:11 PM

ok, ima try to see if i can find a zener diode that can handle up to 75watts in my little breadboard kit.

LoudCamry · 02-13-2009, 12:13 PM

would a transistor or a rectifers work since it acts as a diode??

MrSo0h0o · 02-13-2009, 11:18 PM

The closest thing I can find is the following:

http://www.radioshack.com/product/in...ductId=2062575

It is not rated up to 6A, but 1.5A and a max of 1000V.

carlo$ · 02-14-2009, 09:04 AM

I just had an idea. Instead of using a diode, add two long wires with a toggle switch. With this arrangement the system will work as normal when the switch is off and it will work the way you want it when the switch is on. You get the best of both worlds!

MrSo0h0o · 02-14-2009, 09:06 AM

Quote:

Originally Posted by carlo$

I just had an idea. Instead of using a diode, add two long wires with a toggle switch. With this arrangement the system will work as normal when the switch is off and it will work the way you want it when the switch is on. You get the best of both worlds!

I dont want to add a toggle switch. I want to be able to use the OEM components to control it. I dont care for the DRL's so I wouldnt need to switch it on and off anyway. Thanks for the input though!