Mercedes Benz C-Class (W204) 2007 - 2014 Training Manual: Open luggage compartment

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:

Press the button or on the key or
Insert the key in the ignition lock or
Press the KEYLESS-GO button
Turn the emergency key up to the stop on the left to position 2.
The trunk will automatically open.
Turn the emergency key back to position 1 and remove it.

Legend

Trunk lock

Mercedes Benz C-Class. Emergency Operations

Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Parking: Standby mode (extension of the starter battery's period out of use)
Standby mode function This function is not available for all models. If standby mode is activated, the vehicle can be parked for an extended period of time without losing power. Standby mode is characterized by the following: The starter battery is preserved. The maximum non-operational time out of ...