Question about 1990 Lexus LS 400

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My brake lights do not work tried replacing fuse ,bulbs, modular stil they dont work on my lexus 1990 ls400

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Is the brake light switch hooked up. The wire can be broken near the switch and the switch can fail too. do the turn signals and 4 way flashers work? Course if you have yellow turns then that test doesn't prove anything, The grong to the tailights can fail it's near the trunk latch under the trim, Wire can be broken putting heavy objects in the truck. Does the high mount brake light work? The bulbs in them don't last long the harness to the lights in the trunk lid get in troble and fail too. The light out module has more than one power source and all three have to be good for the brake lights to work does the dash moniter turn on the warning light when you put the brake on with the key on? If it does and the lights don't work the three circuits are good but if the warning doesn't come on and the lights still don't work then your still looking for a blown fuse. even the cig. light fuse has to be good, Check all the fuses with a test light as some blown fuses can look good and be bad.

Posted on Jun 04, 2010

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Then it's probably a ground wire that isen't atached

Posted on Jun 04, 2010

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Lexus ls400 brake lights


check fuse and change bulbs if this dosn't work check brake light switch

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I have a 1990 Lexus LS 400 and the middle rear tail lights are not working but they do work when I press on the brakes. I checked the fuse box by the driver seat and all fuses looked good. What do you guys...


the bulb for the back light and brake is in a single bulb so if one is bad the other will keep working take out the bulb and see it in day light you will see one of the springs in the bulb is broken replace this bulb

Feb 22, 2011 | 1990 Lexus LS 400

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I have a 1990 Lexus 250 ES. Brake lights inop.


check the brake pedal switch by connecting a test light to it and ground.

When the pedal depresses you might hear a click or see the button depress.

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Another way to do this is to change the brake pedal switch and see if it works.

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LS400,1996,replace rear window brake light bulb(s).


THREW THE TRUNK RIGHT UNDER WHERE THE LIGHT IS MOUNTED THERE SHOULD BE 2 WIRES GRAB AND TURN THE PLUG AT THE END OF THE WIRE THE PLUG WITH THE BULB SHOULD POP OUT

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