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It makes the turn signals flash, and it is sensitive to the resistance in the circuit so that if a bulb burns out, you'll know by it flashing quickly. If you do not replace the flasher when replacing the headlights, your turn signals will flash too quickly as your original headlights have 2 turns signal bulbs and the new ones only have one.
That is what it's for yes. The tails are already LED on the car.
Jeff
My 2006 does not have led tailights. I ourxhpurca set of '13 tailights to install. Jw if jumping from non led to led tails involves any resistors or relays? Thanks
^^^^Yes its does, they are larger in size than the LEDs used in current taillights. If you removed the assembly, you would see that there are two bulbs, both replaceable for the turn signal and the back up lights. The tail and brake lights are non-replaceable LEDs.