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TundraGeneral discussion forum for the 2007 and later Toyota Tundra.
This is a discussion thread titled "Fog light mod?", within the Tundra forum, part of the Truck Forums category.
is there any way (thats not too complicated) to make the driving lights come on with just the parking lights? and stay on when the high beams are on? i hate that they can only be on when the low beams are on.
MODERATOR NOTE:corrected topic,changed to fog lights
is there any way (thats not too complicated) to make the driving lights come on with just the parking lights? and stay on when the high beams are on? i hate that they can only be on when the low beams are on.
By Driving Lights I assume you mean Fog Lamps?
Yes, there are threads detailing that modification to your ride. It does look cool in an urban kind of way to have only these lights on.
is there any way (thats not too complicated) to make the driving lights come on with just the parking lights? and stay on when the high beams are on? i hate that they can only be on when the low beams are on.
I haven't taken a look at this yet at all, however all you really need to do is find a way to supply the fog light relay power from the parking lights relay (jumper wire etc...)
I used a mod like that in a previous car I owned, where you just ran a jumper wire from one relay to the other (in the under hood relay/fuse box).
You'd need to do a little research as to which lead to send power too on the relay etc... but I don't see why this approach wouldn't work her.
Again, I have not looked at this at all, so right now it's just a "crazy suggestion" that that might help point you in the right direction.
I haven't taken a look at this yet at all, however all you really need to do is find a way to supply the fog light relay power from the parking lights relay (jumper wire etc...)
I used a mod like that in a previous car I owned, where you just ran a jumper wire from one relay to the other (in the under hood relay/fuse box).
You'd need to do a little research as to which lead to send power too on the relay etc... but I don't see why this approach wouldn't work her.
Again, I have not looked at this at all, so right now it's just a "crazy suggestion" that that might help point you in the right direction.
I can't figure out how to post wiring a new diagram.
It looks like the relay side of the fog light relay has B+ coming from the 15 amp tail lamp fuse and the main body ecu grounds it to close the power switched side when the fog lights are "allowed" on. So it looks like you would have to find a ground to the #2 pin in the fog lamp relay. I don't know if you be able to turn them off if you put a direct ground to them. I need to do some research on this one.
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tundrabay, i went to the link and you had. apparently this is much harder than i thought. i'm not very good at the electrical stuff. i thought that if someone had done this and it wasn't to difficult i'd try it. doesn't look that way. no big deal its not like i can see the front of my truck when i'm behind the wheel except for the occasional glances in store front windows.
tundrabay, i went to the link and you had. apparently this is much harder than i thought. i'm not very good at the electrical stuff. i thought that if someone had done this and it wasn't to difficult i'd try it. doesn't look that way. no big deal its not like i can see the front of my truck when i'm behind the wheel except for the occasional glances in store front windows.
I had considered getting a separate fog light switch (all those blanks to fill in the dash) so that I could just have them on if I wanted. Looked at all those various wiring / soldering / finding ground / "it didn't work after all" postings and I realized I'm too lazy. The DRLs are nice, I know I've got good visibility to traffic passing / oncoming or turning in front of me. . . I see the '07 Tundras coming a long way down the road.
I have enough projects with wiring in my winch, electric brake controller, built-in inverter, Sirius Satellite Radio, door alarm to tell me when my tailgate is open, and central unlocking for the tailgate. . .
That there's a few weekends of projects!!!!
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It looks like the relay side of the fog light relay has B+ coming from the 15 amp tail lamp fuse and the main body ecu grounds it to close the power switched side when the fog lights are "allowed" on. So it looks like you would have to find a ground to the #2 pin in the fog lamp relay. I don't know if you be able to turn them off if you put a direct ground to them. I need to do some research on this one.
You're right,the main body ECU grounds the fog relay coil circuit,same with the headlights.
Three ideas:
1)Bypass the body ecu. Remove FFOG and FFGO wire connections to the ECU then connect those two wires together. The factory fog switch is still used.
2)Remove the connection from body ecu to relay and use a seperate switch to turn the foglights on and off.
3)Use idea # 1 plus a SPDT relay so the fogs shut off @ high beams for legal purposes.
DRLs shouldn't be affected,they're through the headlights right? I'm drawing up diagrams right now...
Bump. I'm trying to figure out how to do this while utilizing the OE switch. There's got to be a cheap and efficient way to do this...but I'm not an electrical-diagram whiz.
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Bump. I'm trying to figure out how to do this while utilizing the OE switch. There's got to be a cheap and efficient way to do this...but I'm not an electrical-diagram whiz.
Idea #1 then. Locate the main body ECU and cut the two wires shown in the diagram then make a jumper wire to bypass the ECU. Another plus to this mod is you can turn them on with just the parking lights,and will stay on even with the highbeams on.
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Idea #1 then. Locate the main body ECU and cut the two wires shown in the diagram then make a jumper wire to bypass the ECU. Another plus to this mod is you can turn them on with just the parking lights,and will stay on even with the highbeams on.
Did it work for you? Looks like it should.
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Fog light mod?
Re: driving lights
Radiant Red 
I had considered getting a separate fog light switch (all those blanks to fill in the dash) so that I could just have them on if I wanted. Looked at all those various wiring / soldering / finding ground / "it didn't work after all" postings and I realized I'm too lazy. The DRLs are nice, I know I've got good visibility to traffic passing / oncoming or turning in front of me. . . I see the '07 Tundras coming a long way down the road.
Linear Mode
