How to enter hidden menu in BMW E39 (5-series service test mode instrument cluster)

Hidden menu in BMW 5-Series E39 (1995-2004) gives access to diagnostic tests and readouts from various sensors in your car. Check battery voltage, fuel level, sound chime, displays and indicators, perform gauge sweep (needle test) and more.
This service mode is made for early diagnostics of your instrument cluster and other vehicle components.
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