GF80.57-P-0003G Drive Authorization System Level 3 DAS (FBS) 3, Function
GF80.57-P-0003G Drive Authorization System Level 3 (DAS [FBS] 3), Function
MODEL 463.306 /336 /346 up to 31.5.12 as of Model Year 2011 /YoM 10
MODEL 463.202 /222 /236 /237 up to 31.5.12 as of Model Year 2009 /YoM 08
MODEL 463.247 /248 /249 /254 up to 31.8.08 as of Model Year 2007
MODEL 463.270 /271 /303 /340 /341 up to 31.5.12 as of Model Year 2007
1 Drive authorization code
2 Drive authorization code
3 Enable engine/transmission control
A8/1 Transmitter key
N3/9 CDI control unit (with diesel engine)
N3/10 ME-SFI [ME] control unit (with gasoline engine)
N15/3 EGS control unit (with transmission 722.6)
N26/5 Electric steering lock control unit
N73 EIS [EZS] control unit
Y3/8n4 Fully integrated transmission control unit (VGS) (with transmission 722.9)
C Drive train CAN
Positions of the transmitter key (A8/1) in the EZS control unit (N73):
A8/1 Transmitter key
N73 EIS [EZS] control unit
Function requirements
^ Circuit 30 ON
^ Valid transmitter key
Drive authorization system stage 3 (DAS 3) - General
DAS 3 is a compound system consisting of control units, each of which calculate and compare the drive authorization code independently. If the check in question is valid, each component is released automatically. The code is computed in dialog between transmitter key and the EZS control unit using the so-called Hash method.
The corresponding Hash value of the transmitter key is transmitted to the other control units by the EZS control unit.
Check, release and feedback is performed separately by each control unit.
The following control units are integral parts of the DAS 3 system:
^ ME-SFI control unit or CDI control unit
^ EGS control unit or VGS control unit
^ Electric steering lock control unit
^ EIS [EZS] control unit
Hash function:
The encrypted base module of the DAS 3 is a so-called Hash function. The most important property of the Hash function is the one-way characteristic. This means that another number can be calculated using the Hash function from an initial number, however that calculation of the initial number in the opposite order is practically impossible.
The DAS 3 allows the following functions:
^ Switching circuit 15C (transmitter key in position "A")
^ Switching circuit 15R (transmitter key in position "B")
^ Switching circuit 15 (transmitter key in position "C")
^ Switching circuit 50 (transmitter key in position "D")
^ Deactivating circuits
Function sequence for switching circuit 15C (transmitter key in position "A")
Inductive power transmission to the power supply for the transmitter key is switched on and encrypted data is exchanged via infrared signals between the transmitter key and the EZS control unit for identification.
When the transmitter key is inserted into the EZS control unit, the power supply to the transmitter key is established inductively in the EZS control unit so that the vehicle can be started even when the transmitter key battery is dead.
The function keys of the transmitter key are not active as long as the EZS control unit is inserted
The next Hash values are computed in the EZS control unit. After completion of the calculation, the energy transmission is switched off. After positive identification the following is performed:
^ Enabling lift solenoid for rotary lock in EZS control unit for transmitter key (transmitter key can now be turned).
^ Key position recognition switched on
^ Waking up interior CAN
^ Output of circuit 15C
^ Encrypted data exchange between EZS control unit and electric steering lock control unit for identification. Following successful communication, the steering lock is unlocked by the electric steering lock control unit and secured
A message is output in the instrument cluster (A1) if an invalid transmitter key is used.
Function sequence for switching circuit 15R (transmitter key in position "B")
Circuit 15R is actuated. Status of circuit 15R is transmitted to the interior CAN.
The transmitter key can no longer be removed in position "B".
Function sequence for switching circuit 15 (transmitter key in position "C")
Circuit 15 is actuated. Status of circuit 15 is transmitted to the interior CAN and the drive train CAN. Power-intensive consumers are supplied by circuit 15X.
Parallel to this, an encrypted DAS 3 query is sent to the ME-SFI control unit or CDI control unit and the EGS control unit or VGS control unit.
Function sequence for switching circuit 50 (transmitter key in position "D")
The starter (M1) is actuated via ME-SFI control unit or CDI control unit. The status of circuit 50 is output to interior CAN and drive train CAN.
Circuit 15X is removed from interior CAN and drive train CAN until circuit 50 is off again and engine running (circuit 61) (time control, if applicable).
When circuit 15X is switched off, the electrical consumers are switched off to facilitate starting the engine.
The transmitter key automatically returns to position "C" when released
Deactivating circuits
Turning transmitter key back to left switches off the engine. The following functions are implemented in the EZS control unit:
Transmitter key in position "B":
^ Switch off signals circuit 15 and circuit 15X.
^ Circuit 15R remains switched on.
^ Adjust drive train CAN communication.
Transmitter key in position "A":
^ Voltage supply for the electric steering lock is switched on.
^ Load switch circuit 15R opens
^ Transmitter key can be removed.
^ The steering lock is locked by the electric steering lock control unit as soon as the transmitter key is removed from the EZS control unit for more than s = 4 mm.
The EZS control unit can request a new check for identification of the transmitter key during restart without removing the key.
