Not sure where you got info about the gong being in your cluster...but that sounds like info that would apply to the new generation BMWs that came AFTER the e53 that have iDrive (like the e60/e65+/e70/e90/f01/f10/f08/etc)...which also uses a totally different communication bus system for sending data to various modules (MOST & LIN bus to name a few).

When you pull up TEST 13 on your instrument cluster and you see "GONG?" in the display...did you press the LEFT instrument cluster button to initiate the TEST?

BTW, do you also have PDC (park distance control) which also utilizes the front gong...and there's a rear speaker located somewhere in the rear, too (if you have rear sensors.

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