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Home >> Mercedes Benz >> 2006 >> C55 >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Anti-Theft & Central Locking -- 203 Chassis >> Basic Knowledge >> Locking with transmitter key, function - GF80.20-P-3005PP

Locking with transmitter key, function - GF80.20-P-3005PP

MODEL 203.0/ 2/ 7 

Fig 1: Identifying Locking With Transmitter Key, Function
G04735395

Shown on model 203.0 Left-hand drive vehicle 

When the "Lock" transmit button on the transmitter key (A8/1) is actuated, it transmits a signal to window antenna, amplifier module 2 (A2/72) via radio. This signal is relayed via the rear SAM control module with fuse and relay module (N10/2) to the EIS control unit (N73).

An infrared signal is transmitted parallel to the radio signal to the left front IR receiver unit (A26/1) or the right front IR receiver unit (A26/2) (precise access required) This signal is read in by the left front door control unit (N69/1) or right front door control unit (N69/2) and is transmitted via the CAN B (CAN B) to the EIS control unit (N73).

The EIS control unit (N73) checks the access authorization of the transmitter key (A8/1). If the access authorization is valid, the EIS control unit (N73) transmits the "Locking" command via the CAN B (CAN B) to the left front door control unit (N69/1), right front door control unit (N69/2), left rear door control unit (N69/3), right rear door control unit (N69/4) and rear SAM control unit with fuse and relay module (N10/2). These then actuate the:

to lock the vehicle.

The opening request of the exterior actuation trunk lid switch (S88/8) and trunk lid emergency release switch (only USA ONLY ) is disabled

IMPORTANT When the driver door is opened while the vehicle was locked previously, the driver door is not locked

An open passenger door is locked

Visual feedback 

After locking and when all doors and the trunk lid (only model 203.0), rear-end door (only model 203.2) or tailgate (only model 203.7) are closed, the EIS control unit (N73) transmits the corresponding request to the rear SAM control unit with fuse and relay module (N10/2) via CAN B (CAN B).

The rear SAM control module with fuse and relay module (N10/2) actuates, as "turn signal master", the CL turn signaling

The

are actuated by the front SAM control module with fuse and relay module; the

by the rear SAM control module with fuse and relay module (N10/2); the

by the right front door control unit (N69/2)

are actuated three times each

  Front SAM control unit with fuse and relay module, location/task/design   GF54.21-P-4108PP
  Rear SAM control unit with fuse and relay module, location/task/design/function   GF54.21-P-4115PP
  Rear door control unit, location/task/design/function Only model 203.0/2 GF72.29-P-4102PP
  Front driver side door control unit, location/task/design/function   GF72.29-P-4105PP
  Front passenger door control unit, location/task/design/function   GF72.29-P-4106PP
  Infrared receiver, location/task/design/function   GF80.20-P-4101PP 
  Transmitter key, task/design/function   GF80.57-P-4101PP 
  Electronic ignition switch control unit, location/task/design/function   GF80.57-P-4102PP