Question about 1992 Lexus Ls 400

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I have a lexus ls400 and my tail lights don't come on. They work when I press the brakes. Is it a fuse or something? I already replaced the bulbs.

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Its you taillight relay located in trunk on driver side directly in corner mounted next to the stereo amp

Posted on Sep 30, 2011

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Check wiring harness that runs round boot/trunk hinge.these get stretched and cause all sorts of probs

Posted on Feb 22, 2009

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  1. I don't have the Year of Your Vehicle Owners Manual will tell You where Fuses are Located, if not I have Resources to Find it for you, need year of Vehicle.
They work when I press the brakes. Is it a fuse or something? I already replaced the bulbs.

Hi I figure You Need to Know That When you press the Brake Pedal Those are the BRAKE LIGHTS that Come on and are A Totally Different Circuit.

Now Off the Cuff I Think its Possible you have, 1 of 2 Causes for this After ruling Out Bad FUSE


  • Headlight switch is Bad because there is a park light lead for Front and another for the Rear Coming out or the Switch.CHECK THIS "AFTER" Rueling OUT Fuse and Cause below.
  • Is A Bad GROUND Connection in the Trunk that Runs From A Connector or Screwed to the Steal of trunk So Fallow the Light Harness FROM Tail Lamps Towards front of trunk Look for A Connector or Ground to BODY in Trunk see if it is Corroded if so Repair With New Eye Connector and Clean to BARE Metal Where its Mounted. IF YOU Find a Harness CONNECTOR Unplug it and inspect it for Corrosion if it is Clean With Electrical Spray Cleaner After this you may need to Plug & unplug a number of time to get a Good Clean Contact then Spray them out again. Plug em together check , If Harness Plugs Were Corroded and still don't work after this Plug is UNREPAIRABLE and must be replaced.
  • I truly Hope this info is of value to you and it Gives you Tail Lights as THATS A TICKIC And I Love Helping folks out.
  • Have A good Day, Rejakwilson

Posted on Jan 14, 2009

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Re please and grease the inside the wire harness be for putting in bulbs.

Posted on Mar 01, 2009

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1 Answer

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I've seen this before, the problem ended up being the brake light bulb lead contacts touching each other on the dual filament bulbs allowing back feed voltage to travel through the park/dimmer switch circuit causing the lights to activate while pressing the brake pedal. I would pull all the brake light bulbs out and look at the back of each one, if you see nothing unusual, I would still replace them all only because it could be internal to the bulbs as well. Let me know if this fixes your problem.
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