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^^^ What did you check so far? Can't help unless you do some diagnostic work first. The above comments on ground loops is the most common issue here.
Need to grab a multimeter and start checking for ground loops (set multimeter to millivolt scale, touch two suspect ground points, should read zero volts, if there are some finite about of potential - you've found a ground loop - continuity check would also work, but not as sensitive).
Could also be a bad LED - try replacing them with standard bulbs and see if the noise goes away. If it does - you could have either bad, noisy LEDs and/or they are the wrong impedance and drawing much more juice than they are supposed to (could damage wiring, PCB traces, put too much of a strain on your charging system).
Could also be something completely unrelated to the bulbs. Could have a bad alternator or the battery is on its way out. Have those checked out and double check the chassis/engine ground points under the hood (just follow the wiring) - make sure the connection point is clean and dry.
As with any electrical work - make sure to disconnect the battery before you start unplugging wiring.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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all i did was buy some led bulbs and replaced the stock ones
Linear Mode
