1strx300

Has anyone had an issue with their high beam headlights not working? I have checked bulbs, fuses, and relay and they all seem to be ok. Any advice would be greatly appreciated!

bearbrew

Several months ago I was having a problem with one of my high beams not working all the time. I replaced the high beam bulbs twice and the fuse to no avail. At this time the light out indicator in the instrument cluster was on. Finally I had someone run thru all the lights while I watched from outside the RX300. Turns out the bulb in the third tail light was burned out. Replaced the bulb and had no more problems.

It still puzzles me as to how the brake light could affect the high beam head light as they are run by different fuses. Perhaps there is something in the lighting system that changes resistance or voltage and can make this occur.

Just my experience.

1strx300

Thanks so much for sharing your experience with me. It's strange because all of our lights work (front and back) but the lights just won't go on high beam. We replaced a couple of bulbs that were still working but looked dark like they were ready to blow. Also, replaced the relay and that didn't make a difference either. Somebody mentioned that it may be in the switch where you turn the lights on but I still don't understand why everything else works except the high beam!

Thanks again!

MellonC00

I have the same problem. At some point this year my high beams (both) stopped working. Can someone shed some 'light' on this subject?

bearbrew

Anyone have a schematic of the high-beam system and possibly trace the electrical path from source to the headlights? Is there a secondary fuse or fuseable link in the circuit?

Bearbrew

carguy07

You need to troubleshoot the headlight dimmer switch and see if it is working.

bearbrew, I think you have those PDFs? If not I can send them to you.

code58

To ANY in this thread who have problems with the high beams not working... have you checked the fuse? high beams are almost always on 1 fuse, whereas the low beams are fused separately. Often people will LOOK at the fuse and say it "looks fine". "Looks fine" isn't worth 5 cents. Test BOTH sides of the fuse with the lights on and if it shows juice on both sides, "reset" the fuse. With the lights off, unplug the fuse and re-insert, 3 or 4 times. I have seen many times, a plug or fuse not conducting the voltage when it looked good and even tested good. A "reset" would bring things back to life. With everything today run through computers and relays, often the control line (what USED to carry the full load), and is now often only the signal line (carries such a low amperage) that it loses the ability to convey the command, even when the contacts look perfectly good. When the wires carried the full amperage of the "load", the amperage was heavy enough to "Power through", not so any more. Check the simplest and easiest 1st! And this fits that description.

bearbrew

Carguy,

I had a PDF schematic until my computer hard drive crashed and I lost everything.

Bearbrew

carguy07

Check your email, you should have them again.

bearbrew

Carguy07,

Thank you for the PDF files. Now,I just need to spend some time chasing everything down.

Bearbrew

bearbrew

Some of the areas to check when both high beam lights fail to illuminate.

Blown fuse or corroded connector.

From the manual.
1. Headlight dimmer switch. Check for continuity across the pins in the
switch.
2. Daytime running light main relay. Check for continuity.

3. Wire harness

Short on time so I will look into the problem when time permits.