ToyotaLexus

just ordered a bunch of LED bulbs from v-leds... 7440s and 7442s....
as well as several other..... then this question occured to me:

will using LED bulbs in the RX300 cause warning light(bulb failure)
or quick flashing turn signal?

HarrierRX300

No problems for me. I changed my from parking lights and rear license plate lights to LED and no problem.

code58

Normally TURN SIGNALS do require a different flasher when you go to LED's. The LED's draw so little juice they won't cause a flasher to work properly.

cduluk

Yes it will, as ive been through this myself.

I replaced the rear tail lights with the same LED bulbs. The indicator on my dash came on within a few hours after installing. I simply removed the indicator bulb from the rear of the dash (figured it would be quicker and cheaper than buying and installing 4 load resistors...

Then i replaced the front and rear directional bulbs with LED bulbs. They started to flash very rapidly. Had to put a load resistor between the + and - for each bulb...

And getting the 3" long load resistors to fit behind the rear tail lights (between the housing and the car) was very tight and takes some maneuvering. NO way in hell could you fit two resistors (one for tail and one for blinker). That's why you really need to take out the pilot light on the dash. The resistors (even with heatsink) do get VERY hot, so be careful not to touch them after they've been on.

As for parking lights and license plate lights, they're not hooked up to the "indicator light" circuit so you don't need a load resistor for these.

They've been running like this for 2 years or so with no problems.

AlexusAnja

+1 to CDULUK. Turn signals with LED act like if the light blew out, just blinks real fast. If you don't mind the quick flashing, let it be, as well as the blown light out.