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 (W204) 2007 - 2014 Training Manual > Electrical System: Relay assignment of the fuse and relay box (SRB)
Relay assignment of front SRB Y Circuit 15 S Circuit 15R L Spare M Circuit 50 (starter) N Circuit 87 engine O Fanfare horn P Secondary air injection pump or oil cooler (AMG) Q Spare R&n ...