olliecampbell Posted February 16 Share Posted February 16 (edited) Hi everyone I got the usual "headlight bulb is out" warning from the car the other day and the low beam had stopped working. I thought it was just a bulb replacement due, it seems it's a little more than that.... The standard H7 low beam has stopped working in the drivers side headlight. Plugging the drivers side headlight into the passenger side loom, the bulb is still not illuminating (I didn't try the other way round). There's continuity between pin6 on one of the bulb connector terminals, and pins 1,4 & 12 on the other terminal. Is this right? I will check that there is power to the pins above from the loom and that fuses are as they should be tomorrow. But as this headlight doesn't work in the passenger loom, I doesn't feel like a supply issue. I know that the wiring is fairly biodegradable on these cars, but what I can see of the wiring to the low beam bulb looks good. What else could it be? If it's the internal wiring, it looks a complete pig to try and sort so am I best just buying a replacement unit before I get pulled over by the fuzz? It's a halogen LCI unit, if that helps? Edited February 16 by olliecampbell Quote Link to comment Share on other sites More sharing options...
olliecampbell Posted February 16 Author Share Posted February 16 (edited) The connector looks right, but is the description correct? I have continuity between pins: 1->4 1->12 4->12 8->9 10->11 Which looks good, except for 1->4, unless that is correct? Edited February 16 by olliecampbell Quote Link to comment Share on other sites More sharing options...
Ray112 Posted February 17 Share Posted February 17 Maybe a stupid question but did you replaced bulb, and did you tried another buld in case first one was just faulty? Quote Link to comment Share on other sites More sharing options...
olliecampbell Posted February 17 Author Share Posted February 17 6 hours ago, Ray112 said: Maybe a stupid question but did you replaced bulb, and did you tried another buld in case first one was just faulty? Yep. Bought a brand new pair. No difference. Quote Link to comment Share on other sites More sharing options...
olliecampbell Posted February 17 Author Share Posted February 17 Definitely have power to pin 3 on the harness (listed in the picture as dipped beam)… Quote Link to comment Share on other sites More sharing options...
Ray112 Posted February 17 Share Posted February 17 2 hours ago, olliecampbell said: Definitely have power to pin 3 on the harness (listed in the picture as dipped beam)… If you have access to multimeter, test continuity from bulb connector to headlight main connector. If you get signed obviously there's nothing wrong with headlight. Next would be to check voltage at harness side, if anything is coming to headlight. If not, check fuses. If all good then need to look at light module, see what faults are there. Another thing you can try is with ignition off and keys out pull high beam stalk towards you( like to flash). With ignition off that will activate "coming home" lights. If those work, obviously it's all good with headlight and wiring a maybe switch is playing up or light module. Quote Link to comment Share on other sites More sharing options...
Ray112 Posted February 17 Share Posted February 17 And you get continuity between 1 and 4 because bulb is in, obviously bulb is connecting ground and positive lane. Quote Link to comment Share on other sites More sharing options...
olliecampbell Posted February 17 Author Share Posted February 17 Ok thanks. Yes get continuity to the bulb connector but wondered if I might be getting a short caused by the biodegradable wiring insulation. i expect it could be a light module issue but why would the drivers headlight not work on the passenger side loom? (Passenger side is working fine) Quote Link to comment Share on other sites More sharing options...
Gonzo Posted February 18 Share Posted February 18 If the faults on the light even when plugged into the other side it has to be the wiring. 1 Quote Link to comment Share on other sites More sharing options...
olliecampbell Posted February 18 Author Share Posted February 18 14 hours ago, Gonzo said: If the faults on the light even when plugged into the other side it has to be the wiring. The internal headlight wiring? Quote Link to comment Share on other sites More sharing options...
Gonzo Posted February 18 Share Posted February 18 3 hours ago, olliecampbell said: The internal headlight wiring? What else can it be if it doesn't work on either sides multiplug. Can you get probes on the bulb socket to check for continuity? Quote Link to comment Share on other sites More sharing options...
olliecampbell Posted March 12 Author Share Posted March 12 (edited) Just for completeness....it was the internal wiring. Replacement headlight, job done. If anyone would like the old headlight then let me know. I can't put an advert up in the For Sale section. Am only looking for postage costs covered Edited March 12 by olliecampbell Quote Link to comment Share on other sites More sharing options...
Ray112 Posted March 14 Share Posted March 14 On 12/03/2024 at 18:23, olliecampbell said: Just for completeness....it was the internal wiring. Replacement headlight, job done. If anyone would like the old headlight then let me know. I can't put an advert up in the For Sale section. Am only looking for postage costs covered Is it LCI halogen light? If so I'll happily have it. Will be something to practice to remove front lens off, before doing it on my actual lights. Just let me know what's the postage costs. Or depends where you are, might be able to collect it. Quote Link to comment Share on other sites More sharing options...
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