Wiring modifications and voiding factory warranty

I am planning to do a DRL mod as I consider DRLs to be an important safety option on vehicles, especially one as seemingly invisible to other drivers as the Prius. However, I am worried about Toyota voiding my warranty due to the modifications to my OEM wiring.

Plan one:
Rewire the 9005 high beams to function as DRLs at 50% power (1/2 of 65w = 32.5w), like on most current Toyota vehicles. This would require detaching the high beam bulbs from the OEM connector and connect them to an alternate wire harness that would enable the 9005 high beam bulbs to switch from the normal parallel circuit (100% power) to a series circuit (approximately 50% power) to serve as DRLs when in Ready Mode and parking/headlights are off. There would be a switch in the dash to enable/disable the DRL function. The system would have several relays to override the half power DRL mode when the high beams are turned on or flashed (switch back to parallel 100% power), or when the low beam head lights are turned on (power cut to high beam bulbs). So basically, other than the transmission position sensor functionality, this mod would mimic what is OEM on most Toyota vehicles available.

Technically, I would not be cutting or altering any of the factory wiring, or wiring harnesses. I would be disconnecting the high beam bulbs from the original factory harness and using my own harness which includes several relays (4), and many fuses (6) to ensure that everything works and is well protected if something doesn't work right. I am also considering making the DRL harness removable to go back to stock when needed (to service vehicle, etc.), though I don't know if any possible ECM codes could be generated from my mod, as the Prius is highly complex, especially with the integrated Hybrid/high voltage components.

Plan two:
Use my add-on OEM-type foglights with the 50%/100% power switching as DRLs with my DRL harness, as in Plan one, to avoid heat issues that can arise from running foglights at full power in a much smaller enclosure during hot, daytime temperatures (1/2 of H11 55w = 27.5w, or 1/2 of H8 35w = 17.5w). The major difference, in my mind, between the two options is that the foglights were not installed from the factory, so any modifications I make to the function and wiring of them can't be considered as altering existing factory components/electrical systems.

I would like the added visibility that the high beam DRLs would give because, in addition to being much higher vertically than the foglights, the high beam reflectors also cast a much wider angle of view than the foglights, which are recessed into the bumper literally inches from the ground. However, the warranty concerns have me thinking I may need to give in and use the foglights as a less than ideal DRL mod.

Sorry for the wall of text, but what do you think?

P.S.
I don't want to install an "LED strip" type DRL system, as I think it would seem like my vehicle is a Eurocar wanna be (no offense to any and all who have these installed.

 

Another question... has anyone run into warranty problems after doing any other mod like automatic headlights, folding/illuminated side mirrors, or SKS installed in passenger door/hatch?

 

Thanks for your reply, I'm aware of the Magnuson-Moss Act, but I also heard it can be difficult to go up against the car manufacturers if they deny you warranty coverage. Something like having to take them to court and such. A major hassle.

 

Lol, yeah that option is very pertinent but implied.