problems with brake light 05 Scion XB?

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Old 01 Jun 2013, 01:09 pm   #1 (permalink)
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Default problems with brake light 05 Scion XB?

My passenger side brake light has went out on my 05 Scion XB. I checked the bulb it was fine but replaced it (both bulbs for that matter) anyway. It still wouldnt work. Ive switched bulbs just to make sure that I haven't had the rotten luck of buying a bad bulb and still only driver side brake light works. It cant be a fuse due to one fuse controls both lights. Anyone else had this problem or know the solution?
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Old 01 Jun 2013, 01:25 pm   #2 (permalink)
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use a multimeter to find out if one side of the socket is shorted to ground. if one side is constantly shorted to ground, then the voltage line has an open as you press on the brake pedal.

if you don't find one side of the socket shorted to ground, and you do see one side of the socket with constant 12 volts, but you do get the 12 volts when you press the brake pedal, then your path to ground on the other side of the socket is open.

Also, are you absolutely sure, with reference to wiring schematics, that they're both serviced by the same fuse? If you have access to the factory wiring schematics, it will always be much easier to troubleshoot electrical problems. I find that without schematics, it can sometimes be a PITA to 'figure' out how electronics works.

More than likely both left and right are serviced by the same fuse. You're always better off with a factory service manual for every vehicle you own. The ones sold at auto parts stores (clymer, haynes brand manuals) IMHO suck.

For future reference, check ebay for cheap digital copies of factory service manuals in PDF format. I bought one for my Prius for $5 and it's really helped me out with a certain minor issue I was confronted with. I also have had factory service manuals in PDF for my motorcycles as well.
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