So I recently added LEDs to my 2009 Lexus RX350 & everything was working fine but they Flickered so I added the Anti Flicker harness that I purchased just in case this was an issue. After installing the harness my RH DRL which are also the High Beams when switched on doesn't work even though I know the bulb is good (crossed checked with LH Harness plug. But even if remove the flicker harness & I hook it back to the main Harness plug the light still wont come on. Also the small bulb at the top of the light doesn't work either & I know it was good because I just replaced it. Fuses look Good. The Lights & Harness came from CARID.
Anyone have a clue what might be wrong.
Thanks

 

I'm confused after reading that lol, so after you tried the anti-flicker harness and removed it, the bulb now does not work in both DRL and high beam?

 

Correct
All the lights worked previously but the DRL/High beam lights would flicker so After I finally got the anti flicker harness installed I noticedbthe RH DRL/High beam wasn't working at all so I thought something might be wrong with AF harness because I actually had to reverse one end of the plug because they were reversed from one end to the other (positive/Negative) I hooked everything up & they worked fine yesterday but today the RH light wont come on with the AF harness so I unplugged the AF harness & plugged the bulb back to just the car harness(the AF comes with a module that plugs in between the car plug & Bulb. So even putting everything back to factory the light wont come on & on the RX350 there is an additional bulb that sits at the top of the headlight fixture just above the regular bulb that doesn't work also. When the DRL light is on so is the smaller bulb which is hooked to a separate plug. I know this all doesn't seem to make sense but it's hard to describe.

 

So, after re-hooking things up it seems to only be the RH DRL that doesn't want to work. The high beam part of this bulb works fine as does the smaller bulb as described above.

 

Have you swapped the Left LED with the Right LED? These aftermarket LEDs typically hate PWM signals which is how Lexyota runs their DRLs, it could be the LED bulb itself is bad when not given 12v constant.

 

Lexuswiz
Thanks for the idea.
That will be something I try in the morning, I did swap the RH to LH when it wouldn't do anything to see if it was the bulb but did not think to try the LH in RH fixture. The LH is fine with no issues & since they both used to work before I added the AF harness & it does the same thing thing even if I unhook the the AF harness & plug it into the factory car harness it very well could be the Bulb.
Been around long enough to figure that out but didn't cross my mind.
LOL

 

Haha no worries, also long as we can get to the bottom of it. I did add LED highs and LEDs to the small bulbs (running lights) with no issues. But unlike you I disabled the DRL completely using techstream, never liked those anti-flicker harnesses. Worked great until I got rid of my RX330.

 

I also have them for small bulbs,Fog & HIDs which work fine.

 

Dble Post so just deleted it.

 

Lexuswiz
I switched the bulbs & it is definitely the RH DRL that is not working. I read something that was g about the fuse box by the RH Tire well but that was a way to not use the DRLs at all. Is it possible that one of those relays might be the issue.

 

I recall it's a single relay to control both DRLs but do double check. If you're willing to put up the cash to test it, I recommend OEM only for DRL relay, aftermarkets can get iffy but with this, Lexus does not accept returns on electrical for me.

 

So are you saying let them check it or just buy the relay from them?
Thanks

 

That's up to you if you want Lexus to check it. But my recommendation is if the relay is the issue (from whoever diagnoses it), replace with a genuine Toyota/Lexus relay only, but this is a gamble since we aren't 100% sure.

 

Thanks for the help & Info

 

Can someone tell me or a pic would be best where the DRL Modules for each light are actually located on the 2009 RX350. The only thing I can find is you have to remove the bumper. I believe that is the problem with the RH DRL not working because I swapped the bulbs with no change & even removed the LED harness to hook straight back to how it was when I bought & the Bulb still it wont light-up for the DRL but will on High Beams. Also checked all the fuses/relays I could find for DRL's.
Thanks