Use the emergency key if the trunk can no longer be unlocked with the key or KEYLESS-GO. Note: The anti-theft alarm signal is triggered if you unlock the trunk with the emergency key. There are several options to stop the alarm:
Legend Trunk lock
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Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Battery (vehicle): Notes on the 12 V battery
WARNING Risk of an accident due to work carried out incorrectly on the battery Work carried out incorrectly on the battery can, for example, lead to a short circuit. This can lead to function restrictions in safety-relevant systems, for example the lighting system, ABS (anti-lock braking system) or ...