Headlight not working - LS 400 Lexus Cars & Trucks

Check fuses first!

Solution: If both headlights aren't working, it's unlikely that a bulb is at fault. The likely cause is a fuse, headlight relay, headlight switch, dimmer switch or a wiring fault. ... Consult your owner's manual to locate the main fuse for the headlight circuit and replace that fuse with one having the same amp rating.
OR
Most total headlight failures are caused by a bad component like a fuse, relay, or module. Wiring problems can also cause both headlights to stop working. High beam headlights don't work or low beams don't work. The cause: A burned out bulb, or a problem with the high beam switch or relay.
https://www.lifewire.com/fix-non-working-headlights-4137021

HEADLIGHTS NOT WORKING

It can be faulty headlight switch or issue with its wiring. Or its faulty head light fuse.

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To troubleshoot the issue i suggest you few help links with appropriate solution. So you can follow the test and confirm what exact problem is there in your case of headlights not working:-----

Click the link below: -----

All headlights not working?

http://repairhelpcenter.blogspot.com/2012/01/all-headlights-not-working.html

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• Working of Headlight switch?
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• Both headlight bulbs blow together?

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• Car headlight bulbs don't last long?

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2007 Dodge Caliber: Low Beam Headlight Not working

http://technoanswers.blogspot.in/2012/06/2007-dodge-caliber-low-beam-headlight.html

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2003 Toyota Camry: Headlights Work Intermittently?

http://technoanswers.blogspot.in/2012/04/2003-toyota-camry-headlights-work.html

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Chevy Tahoe: Low Beam Lamps are not working?

http://technoanswers.blogspot.in/2012/04/chevy-tahoe-low-beam-lamps-are-not.html

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2001 Chevrolet Tahoe: Headlights not coming ON?

http://technoanswers.blogspot.in/2012/04/2001-chevrolet-tahoe-headlights-not.html

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2004 Dodge Ram: High Beam Light is DIM?

http://technoanswers.blogspot.in/2012/04/2004-dodge-ram-high-beam-light-is-dim.html

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2001 Chevrolet Tahoe: Both Low Beam Lamps Not Working?

http://technoanswers.blogspot.in/2012/04/2001-chevrolet-tahoe-both-low-beam.html

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Low beam headlights Modification?

http://schematicsdiagram.blogspot.in/2012/04/low-beam-headlights-modification.html

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How to Replace a Headlight

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight.html

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How to Replace a Headlight Bulb

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-headlight-bulb.html

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How to Replace a Headlight Switch

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-headlight-switch.html

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How to Replace a Headlight Assembly

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight-assembly.html

How to Replace a Park Light Assembly

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-park-light-assembly.html

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Low beam headlights Modification?

http://schematicsdiagram.blogspot.in/2012/04/low-beam-headlights-modification.html

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Headlight Assembly Removal On Honda Accord

http://technoanswers.blogspot.in/2012/06/headlight-assembly-removal-on-honda.html

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Honda Headlight Assembly Removal
http://schematicsdiagram.blogspot.in/2012/06/honda-headlight-assembly-removal.html

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How to Replace a Headlight Door

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight-door.html

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How to replace HID headlight bulbs for lexus 400h?

http://schematicsdiagram.blogspot.com/2012/01/how-to-replace-hid-headlight-bulbs-for.html

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These will help.

Thanks.

On some cases there are few hidden clips holding the assembly from under hood,that has to be released to remove headlight .

There are few troubleshooting help links showing how to replace car headlights,i suggest you to refer the links to solve these issue.

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Click the link below:------
How to Replace a Headlight http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight.html

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How to Replace a Headlight Bulb

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-headlight-bulb.html

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How to Replace a Headlight Switch http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-headlight-switch.html

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How to Replace a Headlight Assembly

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight-assembly.html

How to Replace a Park Light Assembly http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-park-light-assembly.html

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Low beam headlights Modification? http://schematicsdiagram.blogspot.in/2012/04/low-beam-headlights-modification.html

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Headlight Assembly Removal On Honda Accord http://technoanswers.blogspot.in/2012/06/headlight-assembly-removal-on-honda.html --------------- Honda Headlight Assembly Removal
http://schematicsdiagram.blogspot.in/2012/06/honda-headlight-assembly-removal.html-----------
How to Replace a Headlight Door http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight-door.html

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All headlights not working? http://repairhelpcenter.blogspot.com/2012/01/all-headlights-not-working.html

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How to replace HID headlight bulbs for lexus 400h? http://schematicsdiagram.blogspot.com/2012/01/how-to-replace-hid-headlight-bulbs-for.html

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• Working of Headlight switch?
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• Both headlight bulbs blow together?
------------
• Car headlight bulbs don't last long?


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These will help.
Thanks.

Check out related help links with solutions to troubleshoot these problem.
Click the link below directly:---
Heater fan and headlights will not turn off with ignition off? http://technoanswers.blogspot.com/2012/01/heater-fan-and-headlights-will-not-turn.html

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High beams stopped working but headlights still work?

http://howtobyme.blogspot.com/2011/11/highbeams-stopped-working-but.html

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Only one head light works on 2001 Dodge Caravan? http://howtobyme.blogspot.com/2011/11/only-one-head-light-works-on-2001-dodge.html

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Headlight Assembly Removal On Honda Accord http://technoanswers.blogspot.in/2012/06/headlight-assembly-removal-on-honda.html ------------- Honda Headlight Assembly Removal
http://schematicsdiagram.blogspot.in/2012/06/honda-headlight-assembly-removal.html-----------
All headlights not working? http://repairhelpcenter.blogspot.com/2012/01/all-headlights-not-working.html

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Headlight wiring diagram for 1997 Lincoln Town Car?

http://technoanswers.blogspot.in/2012/02/headlight-wiring-diagram-for-1997.html

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Dash Lights And Front Marker Lights Flashing On And Off http://schematicsdiagram.blogspot.com/2012/10/dash-lights-and-front-marker-lights.html
---------- 2001 Chevrolet Tracker: Headlights and Dash lights Pulsating? http://whoisbyme.blogspot.in/2012/06/2001-chevrolet-tracker-headlights-and.html
--------- No parking lights and headlights not turning OFF? http://technoanswers.blogspot.com/2012/01/no-parking-lights-and-headlights-not.html
------------- How to replace HID headlight bulbs for lexus 400h? http://schematicsdiagram.blogspot.com/2012/01/how-to-replace-hid-headlight-bulbs-for.html
--------- Head Lights Comes ON by Itself? http://whoisbyme.blogspot.in/2012/07/head-lights-comes-on-by-itself.html
--------- Only high beams work but head lights not working on Ford F350?

http://howtobyme.blogspot.com/2011/11/only-high-beams-work-but-head-lights.html

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Only high beams working on GMC Savana?---------
• Working of Headlight switch?

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• Both headlight bulbs blow together?
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• Car headlight bulbs don't last long?

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How to replace Headlight Bulbs on Lincoln Town Car?

http://howtobyme.blogspot.com/2011/12/how-to-replace-headlight-bulbs-on.html

How to change headlight?

http://repairhelpcenter.blogspot.com/2011/12/how-to-change-headlight.html

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Both headlights and turn signals not working? http://schematicsdiagram.blogspot.com/2011/12/both-headlights-and-turnsignals-not.html

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Headlights will not turn OFF on Ford expedition and car trailer?

http://technoanswers.blogspot.com/2012/01/headlights-will-not-turn-off-on-ford.html

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Headlight Assembly Removal on 2010 buick lacrosse? http://technoanswers.blogspot.in/2012/04/headlight-assembly-removal-on-2010.html
--------- Headlights flickering and car hesitates to start?

http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html

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Hummers headlights flashes while start?

http://technoanswers.blogspot.in/2012/02/hummers-headlights-flashes-while-start.html

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Using non-AFS headlamp assembly for AFS assembly?

http://schematicsdiagram.blogspot.in/2012/02/using-non-afs-headlamp-assembly-for-afs.html

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How to replace Headlight Bulb on 2001 mitsubishi magna
http://www.howtorepairguide.com/2012/10/how-to-replace-headlight-bulb-on-2001.html

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These details will help.
Thanks.

It can be issue with headlight switch,but as its already been replaced.Try disconnecting high beam headlight wiring from headlight assembly and reconnect direct external wire from headlight switch to headlight assembly,then by switch see if headlight is getting off and turning on or not.
See below related help links,similar to your issue.Click the link below:----
Only high beams work but head lights not working on Ford F350?

http://howtobyme.blogspot.com/2011/11/only-high-beams-work-but-head-lights.html

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Only high beams working on GMC Savana?---------- High beams stopped working but headlights still work? http://howtobyme.blogspot.com/2011/11/highbeams-stopped-working-but.html
---------- • Working of Headlight switch? ----------

• Both headlight bulbs blow together? ----------

• Car headlight bulbs don't last long?
------------ Only one head light works on 2001 Dodge Caravan? http://howtobyme.blogspot.com/2011/11/only-one-head-light-works-on-2001-dodge.html

----------
these will help.
Thanks.

For all types of car headlights repair and service issues.Click the link below and follow the troubleshooting:----All headlights not working? http://repairhelpcenter.blogspot.com/2012/01/all-headlights-not-working.html
--------headlights flashes while start? http://technoanswers.blogspot.in/2012/02/hummers-headlights-flashes-while-start.html
---------Headlights flickering and car hesitates to start? http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html
----------Both headlights and turn signals not working? http://schematicsdiagram.blogspot.com/2011/12/both-headlights-and-turnsignals-not.html
--------Headlight wiring diagram ? http://technoanswers.blogspot.in/2012/02/headlight-wiring-diagram-for-1997.html
---------This will help.Thanks.

might have to replace the headlights/bulbs. I have an 85 rx7 and I didnt have low beams only high and I replaced both headlights and now they work.

take it to the work shop

Dear Sir/Madam,

1. Check your fuses. The plastic panel covering the fuses should have a diagram detailing what each fuse covers. If yours is missing, or unlabeled, check your owner's manual, or a Hanes(tm) or Chilton(tm) repair manual. Often if a headlight is not working, it is the result of a blown fuse. Fuses have a wire running through them that will melt when too much current is run through them. If the fuse is blown, the wire will be broken. If the fuse for the headlight you are working on has an intact wire, it is likely the problem lies elsewhere.
2. Swap the headlight for its twin. If your left headlight does not work, put the light from your right headlight in its place. If it works with the other headlight in place, your headlight bulb is dead, and needs to be replaced.
3. If this does not work, try using a voltmeter on the plug for the bad headlight. Turn on the ignition, and turn the headlight switch. If the voltmeter shows no current, then either your switch or the wiring leading to the headlight has gone bad.
4. If replacing your headlight switch does not solve the problem, then there is a break in the wiring leading to the headlight, and the wiring will need to be replaced.

Thanks
Good Luck


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