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Fog Light Problem

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Old Jan 11, 2024 | 10:46 AM
  #1  
Stude Lover's Avatar
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4wd Low
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Default Fog Light Problem

Anyone here ever deal with the fog lights? My new to me 2003 with 84k (and new engine) works well, but the front fog lights don't come on (rear ones work fine).
Wife wants them fixed, so I'm trying. Found a fuse under the hood, but it's ok. I think the switch is getting power, but nothing happens when it's pushed (no little orange light).
I really doubt both of the front ones are burned out, and yes, I tried them with the headlights on. Is there some other fuse? A grounding wire somewhere? I also tried jumping the connector behind the switch, but no dice.
Any help would be appreciated.
Any yes, I realize how extremely minor this is in the DII world...

Thanks!
 
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Old Jan 11, 2024 | 10:55 AM
  #2  
Richard Gallant's Avatar
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From: Mission BC Canada
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Fogs are wired to low beam (originally) so headlights with the headlights on then the fogs should come on when you push the switch. They could also just be dead.
 
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Old Jan 11, 2024 | 04:10 PM
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greisinb's Avatar
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From: Kitsap County, WA
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Strictly speaking, only the parking lights (and not the headlights) have to be on in order for the fog lights to be on, but since that's also true of the rear light you probably already have that part figured out. I would pull the foglight fuse and put a multimeter set to amps in it's place and try and turn the switch on and off to see if you get and change in current. They're probably just dead.
 
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Old Jan 11, 2024 | 07:12 PM
  #4  
Stude Lover's Avatar
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Originally Posted by greisinb
Strictly speaking, only the parking lights (and not the headlights) have to be on in order for the fog lights to be on, but since that's also true of the rear light you probably already have that part figured out. I would pull the foglight fuse and put a multimeter set to amps in it's place and try and turn the switch on and off to see if you get and change in current. They're probably just dead.
I'll keep trying. OK, someone in a related thread published the wiring diagram for the fog lights. After the 15-amp fuse is a relay. If that's bad, lights don't work. And that relay is powered by the BCM. So, if I bypass that relay, I can deduce more.
 
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Old Jan 11, 2024 | 08:12 PM
  #5  
mln01's Avatar
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From: Charlotte
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You can certainly try bypassing the relay, or you can just swap it with one of the other two or three in the box that are the same size.
 
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Old Jan 12, 2024 | 11:39 AM
  #6  
Tony Luna's Avatar
Winching
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From: San Mateo, CA
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Fogs or aux driving lights?




 

Last edited by Tony Luna; Jan 12, 2024 at 11:41 AM.
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