Toyota Tundra Forum

Hi all! I ran across this PDF and was wondering if this will work or not? I'm more of a SmashBang kind of a guy then Hum, Buzz, light.......... so if someone with some electrical experience could check it out I'd appreciate it before i screw up my truck.

Attached Files

DRL.pdf (201.6 KB, 43 views)

I believe Tox will probably know.

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Good Gawd Squid that is one ugly Tundra.

Lots of reading so I skimmed through parts. Looks like it should work.

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Any questions about truck mods I have done need to be asked in the forums. Don't send me a private message about mods cause I probably won't answer that PM unless there is money involved.

2007 SR5 Crewmax 5.7L 4x4
Mods: nerf bars, Truxedo tonneau, radar detector power, 3M clear bra, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI, Llumar tint, CompuStar Pro alarm, ProComp 6066 20" wheels, Cooper Zeon LTZ 275/60/20 tires, OME HD coilover lift, Firestone helper air bags, 55w reverse lights, stereo cable lock, Tekonsha P3 brake controller, colormatched exterior parts (de-chromed truck), eDead sound proofing, CDT Audio speakers, Custom made speaker brackets, Weathertech floor mats
All mod descriptions and pictures © 2007-2009 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only.

I just read it and it is kind of cool and the guy who wrote it and did the drawing knows his stuff.

Quote:

DIY: Enable DRL Function Even though your Tundra does not have DRL from the factory, all the wiring for DRL is already in place. What you are missing are the DRL/Flasher Relay, and the Logic to control this relay. All the factory functional logic to control the DRL is located inside the Main Body ECU, but you can’t turn this control on. Nor will Toyota allow the dealers to turn it on. That’s Ok. You can “replicate this logic” outside the Main Body ECU using two relays. This design will enable your DRL to operate as follows: With Ignition Key “On” the Turn Signal Bulbs (27-watts) light up as the DRL. With Headlights “On”, the DRL will be turned “Off”. When using the Turn Signal, the DRL for the side you wish to signal will turn off function as the DRL and turn on function as the Turn Signal until the turn indicator is canceled. Once Canceled DRL function will return. If you would like to be able to turn the DRL system off at any time you can install an “Optional Switch” (of your choice). Please see the diagram for the location to install the optional switch. Please note: I have intentionally left out of this design, the ability to turn off the DRL lights when in Park with the Parking Brake applied. I did this to save the cost of a third relay and simplify the design as much as I could. Install switch

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instead if you want to turn them off.

I find it easier to just switch on the headlight (low beam) and leave it on all the time. When I leave and lock the truck, the lights are on a timer of about 20-30 seconds, after which they go off automatically. The battery does not appear to be drained from this setting, even after the truck is sitting idle in the driveway for a few days.

Yeah, I do the same especially since I don't have the automatic headlamp control option. However, the dashboard and temp/clock backlighting does dim slightly when running with any exterior lamps on, which may or may not be a problem - usually not because of the crazy tunnel design.
Also found out that double-clicking the lock button on the remote turns off the lights immediately.

I can't really comment on the original topic though, because the Canadian edition has DRLs enabled by default.