On a Gen. 2 Prius am I going to flip out something by changing a standard filament bulb with an LED? I know that some cars flashers are dependent upon current draw. Higher current draw quicker flasher, lower current draw slow or no flashing. I also know that in some cars changing and standard bulb out with an LED can cause an erratic fast flashing. And still yet on others it flips out a computer which will indicates a problem with the bulb. What about my little Gen. 2 Prius?
If you just change two of the turn signal bulbs to LEDs and leave the other two as regular bulbs you'll have normal flash pattern If you put four LEDs at each corner of the car you'll have a fast flash and you can put the load resistors in on each side to solve the fast flash personally in the front of the car I run the off ram Sylvania amber mirror colored bulbs not LEDs these are glass mirrored bulbs in the front in the rear I have very bright LED turn signals in amber along with red 194 LEDs in the bottom and then very bright LED backup white lights and I have no fast flash in any of the three cars set up like this
I think you will find it is the other way around, and that certainly is what happens in a Gen2. That is, the indicators flash at a faster rate when you replace the (standard) tungsten filament indicator bulbs with LED bulbs. There is no such monitoring by any ECU so you are all okay in this respect. You will have to deal with the hyper-flashing though and that is done by replacing the indicator flasher unit under the dash. A good supplier of automotive LED replacements should also be able to supply a suitable flasher unit to use in conjunction with your new LED bulbs. Having said all that, I am not sure what is the driver for you considering changing to LEDs, but when I considered it for mainly power saving by way of lower wattage bulbs, I decided the savings would be minimal. I have replaced my headlights and side markers though. YMMV.
