Component description for the EZS control unit - GF80.57-P-6003LE
MODEL 221.0 /1, 216.3 as of model year 09 /YoM 08
Illustrated on model 221.0
Location
The EIS control unit is located on the right, next to the steering column.
Task
The EIS control unit has the following tasks:
- Control of functions
- Reading in of signals
- Evaluation of input factors
- Actuation of components
- Power supply for transmitter key (A8/1)
- Interface to KEYLESS-GO control unit (N69/5) (with code (889) Keyless-Go)
Control of functions
The EIS control unit is the master control unit for the following functions:
- Central locking (CL [ZV])
- Convenience feature (CF)
- Drive authorization stage 3 (DAS 3) Encrypted data exchange according to hash method for key identification
- Activation of individual circuits (c. 15, c. 15R, c. 50, c. 15X and c. 15C) depending on rotation angle
- "Keylock function": When the transmitter key is removed, the EIS control unit requests the transmission to shift to gear range "P"
- "Auto N function": If the transmitter key is turned to position 0 (c. 15C) when the engine is running and the transmission is shifted to gear range "D" or "R", the transmission is shifted automatically to gear range "N". The EIS control unit requests the transmission to shift to gear range "N".
- Supplemented auto P function: If the driver door and passenger door is opened following the "Auto N function", the transmission automatically shifts to gear range "P". The EIS control unit requests the transmission to shift to gear range "P".
Reading in of signals
The input factors are read in with the following connections:
- Direct line
- Interior CAN
- Chassis CAN
Direct line
The following signals are read in via a direct line:
- Circuit 30
- Circuit 31 (ground)
- C. 30b (backup battery supply)
- C. 31 emergency supply
- Status of left front door lock unit (A85) (model 221) or left door lock unit (A85) (model 216)
Interior CAN
The signals are read in by the EIS 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 EIS 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.
Actuation of components
Components are actuated with the following lines:
- Direct line
- Interior CAN
- Chassis CAN
Direct line
The intelligent servo module for DIRECT SELECT (A80) can be actuated directly by the emergency path in the event of an error.
If the communication is interrupted or the EIS control unit or the intelligent servo module for DIRECT SELECT is defective, actuation is accomplished over the emergency path. The EIS control unit onboard power supply voltage is switched to the emergency path. A spring-loaded actuator is actuated in the intelligent servo module for DIRECT SELECT and the transmission is shifted to the "Park position. The electrical and mechanical system in the intelligent servo module for DIRECT SELECT are synchronized automatically after reproducing the functionality.
Interior CAN
The signals are transmitted by the EIS 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 EIS 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 EIS control unit, it switches on the inductive power transmission for power supply to the transmitter key.
If the key is not identified (invalid transmitter key), it is still possible to turn the key, however, the circuit is not switched in the EIS control unit. The message "Key does not belong the vehicle" in the multifunction display (A1p13) of the instrument cluster (A1).
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 | Model 216 | PE54.21-P-2104-99CAA |