Start your car, turn on the lights. If the lamp comes on then, it is a tailight. If it didn't come on by turning your lights on, press your brake. If it came on then, you have a brake light out. Also, check and see if any of your P, R, N, D, L lights are not working or are illuminated when they aren't supposed to be, that could be a wiring problem in the left side of your trunk. There is also an integration relay that could be the cause if you find no problem with any of the above. Hope that helps!
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