component description for electronic ignition lock control unit, - GF80.57-P-6001CE

MODEL 204.0/2 as of model year 09/YoM 08 

MODEL 204.3 

MODEL 204.9 

Shown on model 204.0 

Fig 1: Locating Electronic Ignition Switch Control Unit

Courtesy of MERCEDES-BENZ USA

Location 

The electronic ignition switch control unit is located on the right next to the steering column.

Task 

The electronic ignition switch control unit has the following tasks:

• Reading in of signals 
• Evaluation of input factors 
• Control of functions 
• Components Actuation 
• Power supply for transmitter key (A8/1) 
• Interface to KEYLESS-GO control unit (N69/5) (with code (889) Keyless-Go) 

Reading in of signals 

The input factors are read in with the following connections:

• Direct line 
• Interior CAN (CAN B) 
• Chassis CAN (CAN E) 

Direct line 

The electronic ignition switch control unit communicated with the electric steering lock control unit (N26/5) via an bi-directional serial data line.

Interior CAN 

The signals are read in by the electronic ignition switch control unit via the interior CAN.

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Chassis CAN 

The signals are read in by the electronic ignition switch control unit via the chassis CAN.

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Evaluation of input factors 

The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.

Control of functions 

The electronic ignition switch control unit controls the following functions:

• Central locking (CL [ZV])
• Convenience feature (CF)
• Drive authorization stage 3 (DAS 3):
  • Shiftlock function (with transmission 722)

    Encrypted data exchange according to hash method for key identification

  • Activation of individual circuits (c. 15C, c. 15R, c. 15, c. 15X and c. 50) depending on rotation angle

Actuation of components 

The actuation of the components takes place via the following connections:

• Direct line 
• Interior CAN 
• Chassis CAN 

Direct line 

The electronic ignition switch control unit communicated with the electric steering lock control unit via an bi-directional serial data line.

Interior CAN 

The signals are transmitted by the electronic ignition switch control unit via the interior CAN.

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Chassis CAN 

The signals are transmitted by the electronic ignition switch control unit via the chassis CAN.

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Power supply for transmitter key 

When the transmitter key is inserted into the electronic ignition switch control unit, is switches on the inductive power supply to the transmitter key.

Interface to KEYLESS-GO control unit 

• Interface to Keyless-Go control module via interior CAN for Keyless-Go access and Keyless-Go operation
• Mechanical sensing and read-in of KEYLESS-GO start/stop button (S2/3) for KEYLESS-GO operation

Wiring diagram for electronic ignition switch (EIS) control unit

PE54.21-P-2104-99FAA