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 > Warning and indicator lamps: Overview of warning and indicator lamps
Some systems will perform a self-test when the ignition is switched on. Some warning and indicator lamps may briefly light up or flash. This behavior is non-critical. These warning and indicator lamps indicate a malfunction only if they light up or flash after the engine has been started or during a ...