Do you get the chime/gong for other check control warnings? If so, the audible alert has probably been turned off. If you have the hardware/software (like BMW DIS/GT-1), you can hook up and turn the audible LIGHTS ON warning back on.

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• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)