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Old 12-09-2019, 05:06 PM   #1
ZepSL2
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Default Dim driver side headlight fuses checked but strange behavior

i have a dim driver side headlight low beam and high beam dim it also appears the daytime running lights (high beam at what half power?) are not working either side. (unless parking brake needs to be off for them to turn on?)

When i pulled the Left side fuse no change which surprised me i thought the driver side would go out but it stayed on but dim

When i pulled the right side fuse as expected the passenger side went out but unexpectedly the driver side went out also. I swapped fuses no change and i even put a spare fuse in to make sure. it doesn't appear to be a fuse issue

the turn signal works on the dim side and appears to be normal brightness.

what heck is going on?

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Old 12-09-2019, 05:20 PM   #2
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Default Re: Dim driver side headlight fuses checked but strange behavior

Sounds like a poor ground issue.

Just curious too, have you released the parking brake and observed this also? And does the dash RED brake light go off when the parking brake is released?

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Old 12-09-2019, 07:29 PM   #3
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Default Re: Dim driver side headlight fuses checked but strange behavior

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Originally Posted by toggenburg View Post
Sounds like a poor ground issue.

Just curious too, have you released the parking brake and observed this also? And does the dash RED brake light go off when the parking brake is released?
no I didn't release parking brake and that's why i added the part about parking brake. Yes red light goes off but i know from driving before. when i tested this in driveway a few hours ago i never released brake. Just started up and stuck car in neutral and tested.

What i wanna know is WHERE is the current coming from if the left fuse is pulled so that the driver side light are still on but dim? No fuse it should only be ground side reaching the bulbs i would have thought. With fuse pulled it is still dim so that to me means it is getting ground side but wire must be open/short from fuse box to bulb?

I also see the DRL relay is on the right side wiring only. strange.

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Old 12-09-2019, 11:12 PM   #4
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Default Re: Dim driver side headlight fuses checked but strange behavior

I would first take off the parking/emergency hand brake; that needs to be OFF for the DRL circuitry to work, and come on.
The DRLs run through their under the hood relay, then current flows in series to the high beams at 6vdc. You enable and disable the DRL via the parking brake, which if headlamps are turned on, then the same headlights are now powered in parallel to deliver current at 12vdc. Nice huh?

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Old 12-10-2019, 01:10 AM   #5
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Default Re: Dim driver side headlight fuses checked but strange behavior

DRL wiring diagram - http://www.saturnfans.com/forums/sho...wiring+diagram, post#2.

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Old 12-10-2019, 09:48 AM   #6
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Default Re: Dim driver side headlight fuses checked but strange behavior

Check the bulbs.
Rumor has it that some people upgrade the passenger side bulb to “obnoxious bright F_U World!”, but leave the driver’s side stock factory O.E.M. out of courtesy to oncoming drivers in a feeble attempt to make-up for past egregious sins. At least that’s what I heard.

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Old 12-10-2019, 12:32 PM   #7
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Default Re: Dim driver side headlight fuses checked but strange behavior

Quote:
Originally Posted by toggenburg View Post
I would first take off the parking/emergency hand brake; that needs to be OFF for the DRL circuitry to work, and come on.
The DRLs run through their under the hood relay, then current flows in series to the high beams at 6vdc. You enable and disable the DRL via the parking brake, which if headlamps are turned on, then the same headlights are now powered in parallel to deliver current at 12vdc. Nice huh?
interesting


well tested the DRLs this morning neither side works. Put car in neutral
released parking brake. red light goes on dash get out of car go look
and no DRLs BOTH not working. Since i know the passengers side low and high beams work im assuming the DRL relay is hosed?

thoughts?

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Old 12-10-2019, 12:34 PM   #8
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Default Re: Dim driver side headlight fuses checked but strange behavior

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Originally Posted by fdryer View Post
nice thanks

it looks like the left side fuse should cut all + current? or am i missing something. Ill have to study that more later i just quick glanced it right now as i wanted to reply to everyone first lol

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Old 12-10-2019, 12:36 PM   #9
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Default Re: Dim driver side headlight fuses checked but strange behavior

Quote:
Originally Posted by bumpdraft View Post
Check the bulbs.
Rumor has it that some people upgrade the passenger side bulb to “obnoxious bright F_U World!”, but leave the driver’s side stock factory O.E.M. out of courtesy to oncoming drivers in a feeble attempt to make-up for past egregious sins. At least that’s what I heard.
i swapped bulbs and both high beam and low beams bulbs still do it.
And the bulbs were fine on other side.

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Old 12-10-2019, 06:09 PM   #10
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Default Re: Dim driver side headlight fuses checked but strange behavior

Quote:
Originally Posted by toggenburg View Post
I would first take off the parking/emergency hand brake; that needs to be OFF for the DRL circuitry to work, and come on.
The DRLs run through their under the hood relay, then current flows in series to the high beams at 6vdc. You enable and disable the DRL via the parking brake, which if headlamps are turned on, then the same headlights are now powered in parallel to deliver current at 12vdc. Nice huh?
more info I just went out and tested in the dark the DRL's are on but very dim. I thought they were totally out in day light. all lights are dim and on when i did just DRL test. It should be just the high beams at half power right?


Low beams on the passenger side low beam works fine but the high beam is on too but dim and the drivers side are all dim. If i put high beams on then passenger side high beam works fine but the low beam stays on but dim. That should be off right right? driver side all on all dim as always.

I swapped the DRL relay from my other Saturn and no change. That is a working relay for sure cause other Saturn is fine.

if i put the parking brake on the DRL go off nothing is lit up. So that works except its just dim and everything is on not just high beams.

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