Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual: System settings 

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Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > System settings : Activating/deactivating PIN protection
Multimedia system: System → PIN Protection Setting the PIN Select Set PIN. Enter a four-digit PIN. Enter the four-digit PIN again. If both PINs match, PIN protection is active. Changing the PIN Requirements A current PIN must be set. Select Change Settings. Enter the current PIN. Select Change PIN ...