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headlamp
New User
Jan 29, 2008, 11:37 AM
Post #1 of 7
(1730 views)
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I have a 2004 Nissan Pathfinder with one headlamp that is acting up. The daytime light works but the low and high beams do not. I have swaped the bulb from the working side headlamp and have the same issues...so it's not the bulb. I've swaped out the relay switch as well with the same outcome. Any ideas? Can I just run a new electrical wire from the working headlamp to the non-working headlamp?
Thanks
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DanD
Veteran
/ Moderator
Jan 29, 2008, 1:53 PM
Post #2 of 7
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Re: Headlamp issues
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This system uses independent fuses for left & right headlights, # 59 (right) & 60 (left) fuse are found in the under hood fuse box, on the right front fender well; make sure these are ok before anything else.
Here’s a brief description of how the system is intended to work.
The fuses power the relays, the relays are controlled by the “smart entrance control unit”; no I’m not making these names up. LOL.
Once the control unit turns on the relays, powers from the relays go to the “daytime light control unit”. When you turn on the headlight switch (which is a grounding switch) these different ground signals depending on high or low beam goes to the daytime light control unit. This unit, again depending on your request of high or low beam headlight, determines which light elements to power.
Simple right? LOL
As for telling you, who or what is causing this issue would be a complete and total guess. I would have to start doing pin checks and following power flows until we would find the problem.
Dan.
Oh yea; as for running wires from one headlight to the other; don’t.
If one of the control units isn’t at fault for this already, there’s a good chance of them becoming a problem, if you do this. There would be too much draw on that part of the working headlight circuit and likely burn something out, just adding to the problem.
Canadian "EH"
(This post was edited by DanD on Jan 29, 2008, 1:59 PM)
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headlamp
New User
Jan 29, 2008, 3:27 PM
Post #3 of 7
(1711 views)
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Re: Headlamp issues
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Great, thank you Dan!!!
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headlamp
New User
Jan 29, 2008, 7:13 PM
Post #4 of 7
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Re: Headlamp issues
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Hi Dan, okay so I found a burnt out fuse for my left headlamp. I have replaced this fuse with a good one and now another problem...my left headlamp now only works when I switch to the high beams (low still does not work and now the daytime no longer works).
The right headlight (which never had a problem in any setting) now no longer works in daytime setting but does in high and low. Any suggestions?
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DanD
Veteran
/ Moderator
Jan 29, 2008, 7:34 PM
Post #5 of 7
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Re: Headlamp issues
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Try replacing the left headlight bulb? I haven’t checked this system but most daytime lights work by using the high beam’s filaments at a reduced intensity, by using the low beam’s filament as a path to ground (adds resistance to current flow). In other words, if a low beam filament is burnt out, of course it won’t work but it’ll also shut down both (left & right) daytime lights. If this is the case, maybe when the low beam filament burnt, it may have also taken out the fuse that you just replaced?
Dan.
Canadian "EH"
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headlamp
New User
Jan 30, 2008, 5:42 PM
Post #6 of 7
(1691 views)
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Re: Headlamp issues
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Hi Dan,
I was mistaken when I said the daytimes weren't working yesterday (had the e-brake engaged so that's why they didn't come on...stupid me!). Anyway, I have replaced both bulbs, checked both fuses, and now everything works except the left low beam (so both daytime, both high beams...this is new, and only the right low beam works). I'm hoping you have an easy fix to this!?!?! I'm not sure what else I can try!
Thanks
(This post was edited by headlamp on Jan 30, 2008, 6:35 PM)
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DanD
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/ Moderator
Feb 1, 2008, 5:44 AM
Post #7 of 7
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Re: Headlamp issues
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I’ve not actually worked on this particular system but looking at the wiring diagram, I’m assuming that the red wire at the left headlight plug is the power feed to that headlight? Could you confirm this for me by using a test light, clipped to a known good ground (battery negative) and the test light’s probe to the red wire’s terminal of the headlight plug? With the headlight switch on, ignition switch on, the test light should light regardless of high or low beam selection.
Does it?
If not tell me which if any of the three terminals do and what position the high/low beam switch was in?
Like I said, I need to know this, so I don’t send you looking for power on a wire when we should be looking for ground.
Make sure you test that the test light is making a good connection to ground, by touching the probe to battery positive; the light should light.
Dan.
Canadian "EH"
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