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Old 02-23-14, 06:03 PM   #1
1Putt
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Default Headlight low beam issue

Noticed my passenger side HID low beam went out about a week ago... 2008 ls460, out of warranty

1 - changed HID bulb, still out
2 - checked applicable fuses in fuse box in engine compartment, all seems fine
3 - changed to new ballast, still nothing

All the other lights in the headlight are operating fine, only the low beam is still out. Somehow the ballast is not receiving power

Anyone ever encounter this or heard of something ? Pretty much ready to turn it over to my indy mechanic or the dealer if necessary

Last edited by 1Putt; 02-23-14 at 06:33 PM.
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Old 02-24-14, 08:14 AM   #2
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Do you KNOW the ballast is not receiving power? Did you test with an ohm meter?

Don't ya just LOVE electrical gremlins?
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Old 02-24-14, 10:15 AM   #3
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No I haven't tested yet, but that is what I suspect. The headlight housing is brand new
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Old 02-27-14, 09:22 AM   #4
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Update-

As suspected, it's one of the electrical relays attached or integrated into the fuse box in engine compartment that went bad. Just my luck, it's very unusual for this to fail; my indy Lexus shop has never seen this before in our cars and hardly on other models. Strange, the power goes to this relay first then the fuse box, then headlight/low beam. That's why the applicable fuse was still fine. When diagnosing it, they powered the fuse box and the low beam was able to come on.
At least problem was identified
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Old 02-27-14, 11:35 AM   #5
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Soooo ....cheap fix???
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Old 02-27-14, 12:56 PM   #6
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Yeah, the relay is about $50, plus minimal labor to install. Thankfully it's one of the items that are separately serviceable and not part of the fuse box itself. However, they did take about 2 hrs to pinpoint the problem, so that'll probably be added on
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Old 02-27-14, 04:21 PM   #7
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Thanks for the follow up and you came out cheap.
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Old 02-27-14, 05:00 PM   #8
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Quote:
Originally Posted by 1Putt View Post
Yeah, the relay is about $50, plus minimal labor to install. Thankfully it's one of the items that are separately serviceable and not part of the fuse box itself. However, they did take about 2 hrs to pinpoint the problem, so that'll probably be added on
Man everyone is getting good news today!

If it were me, I wouldn't have the same luck. With my luck, I'd go in for a turn signal that wasn't working and they'd tell me the car's computer was kaput.
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Old 02-27-14, 05:21 PM   #9
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I know what you mean... but I feel like I already had the bad luck by having be the relay versus the bulb, which it is 99% of the time
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Old 03-07-14, 06:58 PM   #10
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Another update--

The relay part that was brought in was not the correct item. Ended up having to replace a junction box that contains multiple relays that are integrated to this piece. One of these integrated relays was the culprit. $300 part. Had to wait a little longer, at least now its done and back to normal
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Old 03-07-14, 08:32 PM   #11
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Man, nothing is a cheap fix anymore.
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Old 03-07-14, 08:57 PM   #12
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Still....not TOO bad.... considering. Glad it all works now 1putt!
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Old 03-08-14, 04:34 AM   #13
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Thanks... good to have the baby back after over a week
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2007, ballast, beam, beams, changed, dont, fuse, headlight, is250, lexus, low, lowbeam, ls460, relay, sc400, work

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