GF80.57-D-0005HU Drive Authorization System (DAS), Function

GF80.57-D-0005HU Drive Authorization System (DAS), Function

- with CODE (ZU7) National version for Canada


- with CODE (ZU8) National version for USA







Networking of components
N3/30 CDI control unit (engine 642 with code (MG5) low emission engine EPA 10 / CARB)
N26/5 ELV control unit
N73 EIS [EZS] control unit







Transmitter key settings
A Transmitter key in position "A"
B Transmitter key in position "B"
C Transmitter key in position "C"
D Transmitter key in position "D"
A8/1 Transmitter key
N73 EIS [EZS] control unit

Description
The drive authorization system (DAS) is compound systems consisting of the following control units:
- EIS [EZS] control unit
CDI control unit (engine 642 with code (MG5) low emission engine EPA 10 / CARB)
ELV control unit

The encrypted data is exchanged between the transmitter key and the EIS [EZS] control unit over the crypto-transponder attenuation modulation. During data exchange the cryptographic value is calculated and enabled in the EIS [EZS] control unit.

Function sequence
When the transmitter key is inserted into the EIS [EZS] control module, the power supply to the transmitter key is established inductively via a coil in the EIS [EZS] control module so that the vehicle can be started even when the transmitter key battery is discharged.
Bi-directional infrared communication is accomplished between the transmitter key and the EIS [EZS] control unit

The function keys of the transmitter key are not active as long as the EIS [EZS] control unit is inserted

Transmitter key in position "A"
"Circuit 15C ON"
The inductive energy transfer for supplying the transmitter key with power is activated.
The encrypted data is exchanged between the transmitter key and the EIS [EZS] control unit for key identification. The cryptographic value for the key identification procedure is calculated.
- The electric steering lock (ELV) is locked and unlocked by the ELV control unit. A feedback is output by the EIS [EZS] control unit. The rotary lock is released and the interior CAN (CAN B) woken up.
- On vehicles with code (FY1) ATA 2 with interior protection, towing sensor, and battery-operated horn, the anti-theft alarm system (ATA) is not deactivated and the interior central locking button (N72/1s7) enabled.

As soon as the transmitter key is turned in the EIS [EZS] control unit, it is secured against pulling out.

Transmitter key in position "B"
- "Circuit 15R ON" is activated.
- "Circuit 15C ON" and "Circuit 15R ON" are stored on the activated CAN B bus as message.
- Engine compartment CAN (CAN C) is woken up.
- The load switch circuit 15R is closed.
- Data is exchanged between the interior CAN and engine compartment CAN.

Transmitter key in position "C"
- "Circuit 15 ON" is activated.
- "Circuit 15 ON" and "Circuit 15X ON" are stored on the activated CAN B bus as message.
- The CDI control unit is enabled.
- Load switch circuit 15R remains closed.
- Load switch circuit 15 is closed.

Transmitter key in position "D"
- "Circuit 15X ON" is deactivated.
- The load switches, circuit 15R and circuit 15 remain closed.
- "Circuit 50 ON" is output via the interior CAN and engine compartment CAN.
- Starter relay (50 K40/9k5) is actuated via the CDI control unit.
- Message "Circuit 15X ON" is transmitted to CAN-B only when statues "Circuit 50 OFF" and "Idle stable" are present.

After releasing in position "D", the transmitter key automatically turns back to position "C ".

Shut off vehicle
If the transmitter key is turned back from position "C" to position "B" or from position "B" to "A" in the EIS [EZS] control unit, the status "Circuit 15R ON" or "Circuit 15 ON" changes on the interior CAN.
The power is switched off by the load switches.

Function sequence when turned back to position "D"
- Engine is shut off, i.e. Status "Circuit 61 OFF" is activated.
- "Circuit 15 OFF".
- "Circuit 15C ON" and "Circuit 15R ON" are stored on the activated CAN B bus as message.
- Load switch circuit 15 is opened.

Function sequence when turned back to position "D"
- "Circuit 15C ON".
- The load switch, circuit 15R, is opened.
- Communication with the engine compartment CAN is deactivated.
- The transmitter key can be removed from the EIS [EZS] control unit.

On vehicles with automatic transmission the mechanical shift-lock function prevents that the transmitter key can be removed from position "A", if the selector lever is not in the "Park (P)" position. This caused by a mechanical function in the EIS [EZS] control unit.

When restarting, the EIS [EZS] control unit can request a new check for identifying the transmitter key even when the transmitter key has not been removed.

Function sequence when transmitter key is removed
- "Circuit 15C OFF"
- The electric steering lock is locked by the ELV control unit.