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Old 08-31-2018, 11:16 PM   #1
Ozzy2700x
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Exclamation No illumination/gauge cluster lights. 07 Impreza SE

Heyo. I'm relatively new to this forum, and this is my first thread. Hopefully I can relay my issue as clear as possible.

I have a 2007 Impreza Special Edition. There is a problem with the interior lights on the radio, AC/Heat controls, Door panel switches, and Gauge cluster. The problem is, as soon as I flip the switch in position 1 for my headlights, I can see all of the lights (minus the Gauge cluster) light up for literally a split second and they all go out and stay off. The clock on the dash and the odometer usually have a green back light, and it also goes out, however I think that might be normal for night driving?

Other interior lights such as the dome lights, gauge cluster blips, etc.. work fine though. I think maybe my gauge cluster lights are blown, but everything else I mentioned actually flashes for a split second, so I don't think there's anything wrong with them directly.

I don't know what the previous owner may have done, or the owner before him. My local dealership wants to charge me $105/hr to have them diagnose the issues.. I was hoping maybe someone here could point me in the right direction and save me some $$$. Thank you to anyone who is willing to help me out!
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Old 09-01-2018, 06:27 AM   #2
Blktrax
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If they flash they have power, if they donít blow a fuse then thereís no short, illumination is not on a relay. itís your headlight switch.

*note , UNLESS someone has replaced bulbs with incorrect ones or LEDís , Iíve seen tons of issues with LEDs in these cars
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Old 09-01-2018, 12:21 PM   #3
Cougar4
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The cluster and dash lights are controlled through the illumination control module. Since the lights briefly flash when turned on the trouble might be with the power lead going to the module. There may be a bad connection in the line. It could also be that the module has a problem and needs to be replaced but I suspect that trouble is with the power lead going to the module. I would check the power and ground connections going to the module to verify that proper power is getting to the module while the lights are on. If that is okay and modifications haven't been done to the illumination circuit, then replacing the module is the next step.
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Old 09-01-2018, 05:18 PM   #4
Ozzy2700x
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Thanks for the quick replies! I would like to also add that luckily I have a friend with a 2007 Impreza Wagon that I could play doctor with and swap parts real fast to try and see what works and what doesn't.

Quote:
Originally Posted by Blktrax View Post
If they flash they have power, if they donít blow a fuse then thereís no short, illumination is not on a relay. itís your headlight switch.

*note , UNLESS someone has replaced bulbs with incorrect ones or LEDís , Iíve seen tons of issues with LEDs in these cars
So you're saying I should replace the stock and go from there?

Quote:
Originally Posted by Cougar4 View Post
The cluster and dash lights are controlled through the illumination control module. Since the lights briefly flash when turned on the trouble might be with the power lead going to the module. There may be a bad connection in the line. It could also be that the module has a problem and needs to be replaced but I suspect that trouble is with the power lead going to the module. I would check the power and ground connections going to the module to verify that proper power is getting to the module while the lights are on. If that is okay and modifications haven't been done to the illumination circuit, then replacing the module is the next step.
I'll try replacing the stock first, since that seems to be the easiest thing to do. Where is the illumination control module located in the 07 Impreza? Not even the dealership could find the right diagram...
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Old 09-02-2018, 01:01 AM   #5
Cougar4
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It looks like this model uses a Body Control Module for the illumination control. Look for blue and gray connectors near the steering column under the dash, that tie to the module.
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Old 09-02-2018, 11:42 PM   #6
Blktrax
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It's usually the Dimmer Ring / Headlight switch that fails as the wires get flexed overtime from turn signal use. If the BIU, Body Integrated Unit was the issue, usually you'll see other systems erratic or inoperative.
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Old 09-23-2018, 07:48 AM   #7
fusionartist
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Please don't stop there. This was just getting interesting. My 07WRX dash meters all stop working sporadically from time to time. More recently this is happening more often. Headlights don't work when it is in this condition. Tach, Speedometer, fuel gage, water temp, all of the odometers don't change . After three statrts check engin light comes on telling me that fuel sensor is low. We replaced that sinder and still the same thing. But would that effect the headlights (low and hi beam) parking lights work, turn signals work, fog lights work. radio works normal all lights in radio work, A/C works correctly. Please advise.
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Old 09-23-2018, 07:53 AM   #8
fusionartist
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Location: OKLAHOMA TERRITORY
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0204 02sedan,04wagon
Midnight-Blk; Plat-Silver

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Please don't stop there. This was just getting interesting. My 07WRX dash meters all stop working sporadically from time to time. More recently this is happening more often. Headlights don't work when it is in this condition. Tach, Speedometer, fuel gage, water temp, all of the odometers don't change . After three statrts check engin light comes on telling me that fuel sensor is low. We replaced that sinder and still the same thing. But would that effect the headlights (low and hi beam) parking lights work, turn signals work, fog lights work. radio works normal all lights in radio work, A/C works correctly. Please advise.
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Old 09-23-2018, 01:04 PM   #9
Ozzy2700x
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Sorry it's been a while but I did manage to replace the turn signal stock with a friends, still didnt work. Upon further investigation I pulled the gauge cluster and a lot of the bulbs are blown. I dont know where I should go from here.. it's frustrating.

Edit: No fuses are blown at this time. Fuse 5 and Fuse 12 dont show power unless my headlight switch is in the symbol that has 2 lights facing each other, which is probably normal. If there was a short, involving my HVAC and gauge cluster lights, where should I begin to look?

Last edited by Ozzy2700x; 09-23-2018 at 02:03 PM.
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Old 09-26-2018, 03:16 AM   #10
Cougar4
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You would be wise to purchase a factory service manual to help you find the problems with the wiring. It makes finding the problems much easier. Ebay is a good place to find them for a great price.
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Old 09-27-2018, 12:41 AM   #11
Ozzy2700x
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Solved! I swapped my friends BIU with my car and finally all of the lights were now dimmable and all of the lights actually turned on when my headlights were enabled! Thanks for everyone who contributed towards a solution! Now I can move on to cosmetics and other fun stuff alike.
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Old 09-27-2018, 03:59 PM   #12
Cougar4
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Glad you found the trouble and fixed it. You're welcome for the help.
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