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Old 04-14-2017, 02:22 PM   #1
Blake99
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Default Help! Daytime running lights not wokring

Hi there, I need some help diagnosing my 2004 sti. I am going into get it safetied soon and I noticed my daytime running lights don't work. Already checked the connection behind the glove box on the passenger side to see if they may have been disconnected by previous owner but they weren't. Now I need to check the fuse for them. Wondering where that is located on the car.

Any help appreciated, thanks
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Old 04-14-2017, 02:34 PM   #2
Preludicrous
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The fuse is either behind the dash (in the 06-07 it's behind the coin holder, I'm assuming the same for 04) on the driver's side or under the hood. Consider also that the relay itself may be bad.
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Old 04-14-2017, 06:26 PM   #3
424wrx
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is there a plug in front of the airbox? thats where my relay is on my 08. give it a check.
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Old 04-14-2017, 09:39 PM   #4
Blake99
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Okay, so there are two fuse spots on the car, one behind the coin holder and on the right side on the engine. Now when checking the fuse, on the diagram will it be specifically be labelled "Daytime Running Lights"? Also how would i tell if the relay is bad, where would I look for the relay?
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Old 04-15-2017, 09:47 AM   #5
424wrx
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Quote:
Originally Posted by Blake99 View Post
Okay, so there are two fuse spots on the car, one behind the coin holder and on the right side on the engine. Now when checking the fuse, on the diagram will it be specifically be labelled "Daytime Running Lights"? Also how would i tell if the relay is bad, where would I look for the relay?
look where i am telling you. the plug and relay are right there. should be the same as mine i would think. right below your passenger headlight inside the engine bay.
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Old 04-15-2017, 10:13 AM   #6
Mulder
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Quote:
Originally Posted by 424wrx View Post
look where i am telling you. the plug and relay are right there. should be the same as mine i would think. right below your passenger headlight inside the engine bay.
That's not a relay, it is the dropping resistor for the DRL's. It supplies the reduced voltage to the low beams in DRL mode. You can test it with an ohmeter, it should have a fairly low resistance reading. If it's open that may be your problem. Also you can probe it for voltage when the DRL's should be operating but this may be tricky since the car has to be running with the handbrake released so you need to make sure it doesn't roll. The resistor should have full vehicle voltage on one side and reduced voltage on the other.
I'll assume your low beam lights do work when you turn them on normally?

By any chance is your brake light on with the car running? If it is, due to low brake fluid, the DRL module will be getting the same signal as if the handbrake was up and the DRL's will not turn on.

Also a note-Blake it looks like you are in Canada. Your version of the STi had halogen lights with DRL's in '04, ours in the US had HID's with no DRL's. This was because they are a legal requirement up there but not down here.
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Old 09-17-2019, 07:59 PM   #7
wawacoffee
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Quote:
Originally Posted by Mulder View Post
By any chance is your brake light on with the car running? If it is, due to low brake fluid, the DRL module will be getting the same signal as if the handbrake was up and the DRL's will not turn on.
OMG I have spent all day figuring out what's the matter with my DRL circuit to install a custom LED DRL. I test every single wire, fuse and relay and concluded it is the problem of body integration unit (BIU) and there is nothing I can do beyond taking it to the dealer to be checked with a Subaru Select Monitor. Now I know it is because of the had brake. I always park my car with handbrakes on and never thought about it. Thanks a lot.
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Old 09-17-2019, 09:20 PM   #8
WRXnick16
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The handbrake will certainly do it Also makes it harder to take a picture of the DRLs.. no parking on inclines/declines.
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Old 09-18-2019, 09:03 AM   #9
rtv900
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why does it matter for your safety inspection?

I disabled my DRL's on my 16 and never once had anybody ask about it
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Old 09-18-2019, 10:22 AM   #10
Norm Peterson
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Quote:
Originally Posted by rtv900 View Post
why does it matter for your safety inspection?

I disabled my DRL's on my 16 and never once had anybody ask about it
OP lives in Canada where DRLs are required by law. Pay attention!


I pulled the plug on the DRL dropping resistor on the '10 LGT we used to have within a couple of weeks after driving it home. Eventually took it completely off the car. Never had any issues with inspection or otherwise with inop DRLs myself either (and just for your individual benefit, rtv600, disabling the DRLs neither screwed up nor helped the double-clutching ).


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