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Old 08-15-2010, 05:20 PM   #1
Scooby Newbie
Member#: 165780
Join Date: Dec 2007
Chapter/Region: NWIC
2006 STI

Default major electrical issue - hitting breaks with lights off causes lights to come on wtf

I noticed a major issue today when I turned my car on after going camping. When I hit the breaks with my lights off it turns my cruise control off and all of the lights in my cabin to dim to the 'lights on' setting. It also creates a nice 'flick' sound everytime I hit them. The thing is it doesnt cause my actual lights outside to come on. If I turn my lights on and hit my breaks it does nothing BUT it does not allow me to set the cruise control. It will let the 'cruise' light come on, but it will never 'set'.

Anybody have any experience with a issue like this or what it could possibly be?
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Old 08-15-2010, 06:56 PM   #2
Henry H
Scooby Newbie
Member#: 184330
Join Date: Jul 2008
Location: Southern California
2008 Impreza 2.5i
Dark Grey Metallic


Test this first, remove the fuse to the brake lights and try to reproduce the problem. Do this in your driveway of course, don't drive with your brake lights out.

If you do not see the problem happening, then it looks very much like a short is happening somewhere between your brake light fuse to the lights themselves (relay and switch from your brake pedal included). Have fun tracing the short.

I'd start thinking about damage that could have occurred from camping. Also look around where circuitry between your brakelamps and cruise/interior lighting may cross.
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Old 08-15-2010, 07:46 PM   #3
Trust no one
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
02 WRX
15 WRX/05 GTO


There is a cross between the brake and parking light circuits. When this happens, it is most commonly caused by a damaged, incorrect, or improperly installed brake/tail light bulb. Open up the tails and check every bulb, I'm betting you'll find the problem. It may even be a dual-filament bulb where one of the filaments burned out and is now making contact with the other filament in the bulb, thereby bridging the two circuits.
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