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Old 06-03-2008, 10:38 PM   #1
Snowphun
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Default Combination switch acting up, just affecting one headlight?

I'm having an issue with my headlights that is somewhat different that the other combination switch issues I found when searching: sometimes the drivers side low beam goes out, but the passenger side is never affected. Typically it happens when I touch the stalk to use a turn signal, but not always. Sometimes it comes back on its own, other times I wiggle the stalk and the light returns. I have changed the bulb a number of times so I am confident that is not the issue. Usually I do hear the relays clicking away when the light goes out, similar to what other people have seen wth stalk issues.

So, my question: has anyone else had combination switch issues that only affected one low beam?

Thanks.
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Old 06-03-2008, 11:02 PM   #2
jdubya301
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what year wrx do you have?
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Old 06-04-2008, 06:09 PM   #3
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It's a MY02.
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Old 06-04-2008, 07:42 PM   #4
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hmmm. i looked at the 02 wiring diagram, and the only separation i could find between the left and right headlights was the power supply.

it looks like each light uses it's own fuse under the hood. maybe thats where you are having a problem?
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Old 06-10-2008, 03:24 PM   #5
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Thanks for the suggestion, I was surprised to see seperate fuses and relays for both headlights. I swapped both the fuse and relay side to side, unfortunately the problem continues on the left side. I'm thinking now that it is not the combo switch but something else, maybe a bad connection somewhere. The issue appears to be only with the low beam, I can switch to highs and it comes on immediately, turn the highs off and the low is still out. I'm going to reinstall my DRL module and see if the low beam goes out with just the DRL's on. I would expect it to.
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Old 06-11-2008, 02:48 PM   #6
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yeah this really stumped me.. maybe cougar4 can chime in... he is really good at the factory wiring thing.

maybe shoot him a pm
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Old 06-11-2008, 10:55 PM   #7
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The cat is here and on the prowl for the next trouble. Thanks for the vote of confidence Jdubya301.

The info I am looking at shows that power to each side of the low and high beam lights share a common power source for each side. Since you state that the left side high beam has no problem this means the power at fuse 8 (left side) should be ok. There is a splice somewhere after the fuse that provides power to each of the left side lights. There may be a problem at the splice but the first suspect would have to be the connector to the low beam light. Inspect the light connector contacts for signs of damage or heating. If that is good check to see if the red/blue wire has 12 volts on it with reference to ground while the trouble is occurring. If the voltage is low then the slice needs to be checked. It may be at the fuse panel but I don't know for sure.

Last edited by Cougar4; 06-11-2008 at 11:01 PM.
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Old 06-12-2008, 01:51 AM   #8
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np cougar.
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Old 10-06-2008, 11:39 PM   #9
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Did you ever find the cause of this? I am having the same problem.
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Old 10-07-2008, 07:17 AM   #10
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Yep. I had two problems: the stalk was acting up so I replaced that (about $65). The bigger issue with the left headlight was a mostly burnt out headlight harness. A replacement harness from Auto Zone fixed that. Pull the bulb and have a careful look at the plug, it may have some melted plastic and connections.
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Old 10-07-2008, 06:28 PM   #11
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I pulled my headlight out today so I could have some room to look at what was going on. The harness was fine, there was no corrosion or anything that looked melted. Checked the fuses, they were all fine as well as the relays. Went back scratching my head, put the meter back on the harness and wtf there is power? Tried the test light, worked.. Tried the bulb, it worked too, so I am dumb founded. It all works now. However in the process of diagnosing the troubles, I dropped my old bulb that I thought was bad, and is bad now, and I broke my pass side bulb. hahaha. Sooooooooo yeah, I dunno.
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