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Home >> Mercedes Benz >> 2011 >> C350 >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Anti-Theft/Central Locking System - C63/C350 (204) - 2 Of 2 >> Basic Knowledge >> Central locking (CL [ZV]), function - GF80.20-P-0005CE

Central locking (CL [ZV]), function - GF80.20-P-0005CE

MODEL 204.0/2 as of model year 2009/YoM 08 

MODEL 204.3 

MODEL 204.9 

Vehicles up to 30.11.09 

Fig 1: Central Locking Function Diagram (Up To 30.11.09)
G07531872Courtesy of MERCEDES-BENZ USA

Central locking as of 1.12.09 up to 31.5.10 

Fig 2: Central Locking Function Diagram (As Of 1.12.09 Up To 31.5.10)
G07531873Courtesy of MERCEDES-BENZ USA

Central locking, as of 1.6.10 

Fig 3: Central Locking Function Diagram (As Of 1.6.10)
G07531874Courtesy of MERCEDES-BENZ USA

Central locking (CL [ZV]), general 

The CL actuates the electrical locking/unlocking function of the vehicle doors, trunk lid (model 204.0/3) or liftgate (model 204.2/9) and fuel filler flap.

The following control elements are available:

IMPORTANT The liftgate control function is described in a separate document "Rear door remote actuation function"

The CL function comprises the following partial functions:

Further subfunctions will be described in separate documents:

Additional function requirements for emergency opening in event of crash 

Function sequence for emergency opening in event of crash 

The emergency opening function unlocks the doors of the vehicle after an accident. If the supplemental restraint system control unit recognizes an accident, it transmits a corresponding signal to the electronic ignition lock control unit and front SAM control unit via the chassis CAN.

Parallel to this, accident recognition is also accomplished by the crash sensor integrated into the front SAM control unit.

When an accident event is recognized, the front SAM control unit sends the "Emergency opening" request via the interior CAN to the following control units:

IMPORTANT On vehicles up to 30.11.09 the central locking of the rear doors is controlled by the front SAM control unit (except vehicles for Great Britain).

After a waiting time of t = 8 to 11 s, all vehicle doors are locked.

The emergency opening function overrides all other central locking functions.

When the vehicle has been locked from the outside, the emergency opening function is not active. In the event of rear end collision, the CL is unlocked without waiting time.

Function sequence for mechanically locking trunk lid (on model 204.0/3 with code (887) Valet Parking) 

The mechanical trunk lid locking feature allows valuables to be locked in the trunk intentionally.

Mechanical locking of the trunk lid is defined via the status of the trunk lid contact switch. The trunk lid contact switch can be actuated by turning the emergency key of the trunk lid lock cylinder.

The rear SAM control unit directly reads in the status of the trunk lid contact switch and inhibits the opening requests from other control points.

Additional function sequence for subsequently locking trunk lid (model 204.0/3) or liftgate (model 204.2/9) 

Function sequence for subsequently locking trunk lid (model 204.0/3) or liftgate (model 204.2/9) 

When the trunk lid of liftgate is closed subsequently, the rear SAM control unit sends the status of the trunk lid rotary tumbler switch (M14/7s1) (model 204.0/3) or the liftgate rotary tumbler switch (M14/7s1) (model 204.2/9) to the electronic ignition lock control unit via the interior CAN. The latter then checks whether all vehicle doors are closed. If so, the electronic ignition lock control unit sends the request to output the turn signal confirmation that the vehicle is locked.

Additional function requirements for additional door lock (on model 204.0/2/3 for Great Britain) 

Function sequence for additional door lock (on model 204.0/2/3 for Great Britain) 

The mechanical inside door handle is decoupled mechanically by the additional door lock when the CL is locked.

It is no longer possible to open the doors from the inside.

This prevents breaking in into the vehicle by smashing in a window and opening a door from inside.

Upon locking with the central locking, the electronic ignition lock control unit also sends the request "Additional locking" to the following control units, via the interior CAN:

The following actuator motors are then actuated:

The power for the rear door control unit is supplied via the rear SAM control unit and in addition over the fuse carrier left rear door control unit (F64/1) (on model 204.0/2/9) and fuse carrier right rear door control unit (F64/2) (on model 204.0/2/9).

Function sequence for play protection 

Each actuation of the CL [ZV] is counted by the electronic ignition switch control unit. Every t = 7 s one actuation is deducted from the current counter status. The maximum number of actuations is 40.

After reaching this value, further action requests for the CL are not performed.

Actuation of the CL [ZV] again is possible only after dropping below this value again.

Operating central locking with transmitter key, function GF80.20-P-2002CE 
Locking/unlocking vehicle with inside switch, function GF80.20-P-3009CE 
Automatic locking, function GF80.20-P-4009CE 
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