GF80.57-P-0003SX Drive Authorization System Level 3 (DAS (FBS) 3), Function

GF80.57-P-0003SX Drive Authorization System Level 3 (DAS [FBS] 3), Function

Component Identification:

Description
The drive authorization system stage 3 (DAS 3) is a system combination of control units consisting of:
^ EIS control unit (EZS),
^ ME-SFI control unit or CDI control unit
^ Fully integrated transmission control (VGS) control unit or electronic transmission control (EGS) control unit
^ Intelligent servo module for DIRECT SELECT

Hash function
The encrypted base module of the drive authorization system, stage 3 (DAS 3) is a so-called "Hash" function. The most important property of the "Hash" function is the one-way characteristic. This means that by using the "Hash" function, a number can easily be calculated from another number.It is not possible to calculate vice versa.

The encrypted data is exchanged between the transmitter key and the EIS control unit via infrared signal. The code is computed in dialog between the transmitter key and the EIS control unit using the Hash method.
The corresponding Hash value of the transmitter key is transmitted to control units by the EIS control unit. Check, release and feedback is performed separately by each control unit

Up to eight transmitter keys can be used simultaneously. A special memory cell is available for each transmitter key in all relevant components.

Function
The transmitter key identifies itself to the EIS control unit when inserted into the EIS control unit.If identified positively, the lift solenoid in the rotary lock is enabled in the EIS control unit. The transmitter key can now be turned.

The function keys in the transmitter key are no longer active.When turned, the transmitter key is secured against removal.

An encrypted request is sent to the drive authorization by the:
^ ME-SFI control unit or CDI control unit,
^ fully integrated transmission control (VGS) control unit or electronic transmission control (EGS) control unit, and
^ intelligent servo module for DIRECT SELECT
to the EIS control unit.Each of these control units checks separately whether the data package is enabled and provides the EIS control unit with a feedback.During this communication, the ME-SFI [ME] control unit serves primarily as a gateway between the chassis CAN and drive train CAN.

Transmitter key in position "0"
^ The inductive energy transmission to the voltage supply of the transmitter key is switched on.
^ Encrypted data exchange between transmitter key and EIS control unit for identification.
^ Calculation of next hash value in transmitter key
^ After the calculation is completed, the transmitter key signals that the "power supply is switched off".

After positive identification the following is performed:
^ Release of rotary lock in EIS control unit for transmitter key
^ Key position recognition switched on.
^ Wake-up of chassis CAN and interior CAN
^ Signal output of circuit 15C

Transmitter key in position "I"
^ Actuation of circuit 15R
^ Status output of circuit 15R from EIS control unit to chassis CAN and interior CAN

Transmitter key in position "II"
^ Circuit 15 is actuated
^ Status output of circuit 15 and circuit 15X from EIS control unit to chassis CAN and interior CAN

Transmitter key in position "III"
^ Actuation of starter (M1) by relay circuit 50, starter (N10/1kH) via ME-SFI control unit and CDI control unit
^ Output of status c. 50 to chassis CAN and interior CAN
^ Circuit 15X is actuated by chassis CAN and interior CAN until circuit 50 is off again and the engine is running (circuit 61)

The transmitter key automatically returns to position "II" when released.

Take vehicle out of operation
When the transmitter key is turned back to the left, the engine is switched off and the circuit status is changed correspondingly If the transmitter key is in position "I", circuit 15R remains switched on.If the transmitter key is in position "0", the transmitter key can be removed.

Keylock, function

Conditions of operation
^ Vehicle at rest

Function
The EIS control unit transmits the request to automatically shift the transmission to the "Park position" when
^ the transmitter key is removed from the EIS control unit, or
^ when the driver or front passenger door is opened (only with code (889) Keyless Go)
to the servo module for DIRECT SELECT. It shifts the transmission to the "Park position".

Emergency function
If the communication is interrupted or the EIS control unit or the servo module for DIRECT SELECT is defective, the emergency path is actuated. The EIS control unit on-board power supply voltage is switched to the emergency path. A spring accumulator is actuated in the servo module for DIRECT SELECT and the transmission is moved to the "Park position". The electrical and mechanical system in the servo module for DIRECT SELECT are synchronized automatically after reproducing the functionality.