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It such a simple thing but I seem unable to explain it. The problem is that I don't know what I'm looking for because I don't know which lights are the brake lights. I know that there are at least three sets of lights which are the brake lights which are all on the trunk lid. There is the row of lights that are in the middle of the trunk. There is also one light in left corner of the trunk lid and another in the right corner of the trunk lid. In other words if you open the trunk you are raising all of the brake lights with it. They are all single filament bulbs and as far as I can tell that is all of the brake lights. The remaining lights are on the body of the car. The taillights,rear turn signals and the back-up lights. But in the taillights there are two bulbs. One small single filament bulb and one double filament bulb that looks like a standard 1157 bulb but it's not. In every other car that I have ever seen where there is a double filament bulb in the taillight, one filament is for the taillight and the other filament( which is brighter) is for the brake lights. Is this the case with a BMW? If it isn't I have no idea why they would use a double filament bulb there. It would serve no purpose. What I believe to be the case is that the taillight is also supposed to be a brake light(ie... the second filament should light when you apply the brakes) but it isn't which would explain the "brake light circuit failure" message that displays.
Again to ask the question simply, are the three lights that are on the trunk lid the only brake lights or are the taillights also brake lights.
I hope I haven't totally confused everybody.
Mike
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