677 HIFI System Professional – the TOP HIFI (also known as Logic 7) sound amplifier.644 Preparation f mobile phone w Bluetooth – this is the MULF or MULF 2.Enter the last 7 characters of your VIN number here or here and check if the list shown on the website includes: First, check whether your car comes with the bluetooth and / or sound amplifier modules that are known to be prone to failure.The most common other causes: the bluetooth module (MULF or MULF 2) and the sound amplifier (TOP-HIFI, also known as Logic 7). Another module connected to the fiber optics ring is faulty and prevents the proper functioning of the CCC iDrive.If a disk does not come out by itself, please do not force it out (as this may cause mechanical damage). The CCC has trouble reading the CD / DVD.In case of sound issues, always start with checking: (1) speakers (2) fuses, in case of total lack of sound (3) sound amplifier (if your car has one) (4) connections leading to the speakers. Disturbing noise: sound parasites, crackling noise, screeching noise after a dead battery / disconnecting the battery / replacing the battery.If you don’t have a separate sound amplifier module, then the lack of sound is likely caused by the CCC iDrive. If these graphical anomalies appear at the same time as the CCC iDrive reboots, then the strange lines on the screen are most likely caused by a faulty CCC, not by a faulty display. You sometimes see graphical disturbances (horizontal and vertical lines) on the screen.The less common symptoms of a BMW CCC failure: The CCC console buttons lights remain always on.The iDrive sat nav does not eject the CD / DVD anymore when pressing the Eject button.
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