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i have been having the same issue for 2 months. finally fedup and took the amp out for inspection. everything looked good. put it back in and everything is back in working order. 2 days later back in the same hole. tried it again worked again, now it is no longer doing the trick.
it could be the battery i thought, but how is it possible all of us different years and mileage are complaining about the same issue. i thing it is a faulty amp that Bmw installed.
We all know about the L7 amp issues with E6x. this could be the E9x version of it.
please keep the updates coming.
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