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 > Warning and indicator lamps: Safety systems
Warning/indicator lamp Possible causes/consequences and ► Solutions Brake warning lamp (USA) Brakes warning lamp (Canada) The red brake system warning lamp is lit while the engine is running. Possible causes are: The brake force boosting is malfunctioning and the braking characteristics may be af ...