Factory HID low beam suddenly dim

Tiny
MICHAEL95540
  • MEMBER
  • 2015 LEXUS RX 350
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
All other lights work. Not bad bulbs I already tried swapping. Checking fuses under the hood. All good except #49 which is for HID. Fuse not blown. Checked contacts without the fuse while engine on and headlight on, no power on #49. I cannot find a relay. Only relay is for DRL. Low beam on but not light up like before. Power to both ballasts okay.
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Saturday, April 23rd, 2022 AT 8:55 AM

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Tiny
KENNY K
  • EXPERT
Both headlights are dim, and they did this at the same time?

If that is the case, then we most likely have a control issue, but we need to start with checking the voltage that you are getting on each of the low beam circuits.

Basically, we need to find out if you are getting 12 volts going to the assemblies.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

If you are then we have a different issue.

However, let's start with this and then take a look at the wiring diagram which will show the relay that you have for each side.

Let's run through this and we can go from there.

Thanks
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Sunday, April 24th, 2022 AT 3:41 PM

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