Windshield Reading System Control Unit, Component Description - GF82.85-P-6001KJA
MODEL 453.0/3/4 as of Model year 2018
with CODE 54P (Line package rental model)
MODEL 453.0/3/4 as of Model year 2018
with CODE P02 (car2go)
Location
The windshield reader system control unit is located on the driver side in the instrument panel on the instrument cluster (A1).
Shown on Model 453.3
Task
The windshield reading system control unit is the master control unit of the car2go system with code P02 (car2go) and the rental system with code 54P (Line package rental model). It is used for radio communication (Global System Mobile (GSM)) for transmitting customer authorization, rental and billing data to the car2go or rental company head office. Using near-field communication (NFC) or GSM, the windshield reader system control unit communicates via the car2go app with the customer's smartphone and reads in the customer's authorization data. The output of information to the customer outside the vehicle during the rental process takes place via the car2go app on the customer's smartphone or in the display. The windshield reader system control unit is at the same time the interface for the card reader (A50/5) in the vehicle. The windshield reader system control unit is also used for exchanging audio support communication between the customer and the car2go or rental company head office, and is therefore the interface to the smart radio multimedia navigator (A40/3) and its hands-free system as well as the interface to the windshield reader system access electronic key box (A506). The windshield reading system control unit tasks are broken down as follows:
- Read in sensors and signals
- Evaluation of input factors
- Component actuation and signal transmission
Read in sensors and signals
The input factors are read in via the following connections:
- Global Positioning System (GPS)
- Near Field Communication (NFC)
- Global System Mobile (GSM) and Universal Mobile Telecommunications Systems (UMTS)
- Direct line
- car2go LIN (LIN A1)
- Telematics CAN (CAN A)
Global Positioning System (GPS)
The following signals are read in using GPS:
- Vehicle position
Near Field Communication (NFC)
The following signals are read in via NFC:
- Customer authorization and drive authorization data
Global System Mobile (GSM) and Universal Mobile Telecommunications Systems (UMTS)
The following signals are read in via GSM or UMTS
- Data for communication with car2go or rental company head office and approval of the rental process, etc. through the integrated GSM/UMTS antenna (A2/24)
- Authorization and drive authorization data from customer's smartphone via the car2go app
Direct line
The signals from the following sensors are read in via direct lines:
- USB signal from the Smart Radio Multimedia Navigator
- Audio signals from the Smart Radio Multimedia Navigator
- Wake-up signal from the telematics services communications module (N112/2)
- Circuit 30g from the vehicle interior fuse and relay module (F2)
- Circuit 31
car2go LIN
The following signals are read in via car2go LIN:
- Key identification and status of transmitter key and fuel card in card reader holder, authorization and drive authorization data from card reader
Telematics CAN
The following signals are read in via the telematics CAN, for example:
- Vehicle data, kilometer reading, rental and parking times
- Wheel speed
- Central locking status
- Status of power windows
- Fuel tank fill level
- Battery charge level
- Engine status on/off
- GPS position
- Windshield reader system access electronic key box data
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor of the windshield reader system control unit and the relevant component parts are then actuated.
Component actuation and signal transmission
Component actuation and signal transmission take place via the following connections:
- GSM and UMTS
- Direct line
- Telematics CAN
- car2go LIN
GSM and UMTS
The following signals are transmitted via GSM/UMTS, for example:
- Customer authorization and billing data to car2go or rental company head office (kilometer reading, rental times, parking times, fuel tank and battery fill level vehicle data) through the GSM/UMTS antenna
Direct line
The following components are actuated via direct lines:
- Wake-up signal to the telematics services communications module
- Audio line to the Smart Radio Multimedia Navigator
- USB signal to the Smart Radio Multimedia Navigator
Telematics CAN
The following signals are transmitted via the telematics CAN to the telematics services communications module and from there to other control units, for example:
- Authorization data such as car2go identification, car2go code, car2go request for opening/closing of the vehicle to the center SAM control unit (N10/10)
- Windshield reader system access electronic key box (A50/6) data
car2go LIN
The following signals are transmitted via the car2go LIN to the card reader (with key holder), for example:
- Authorization data such as rental or car2go code and request for release of the transmitter key and the fuel card
| Wiring diagram of windshield reading system control unit | Model 453.0 (except 453.091), 453.3 (except 453.391), 453.4 (except 453.491) as of model year 2018 with code P02 (car2go) | PE82.85-P-2008-97BBA | |
| Model 453.091/391/491 as of model year 2018 with code 54P (Line package rental model) Model 453.091/391/491 as of model year 2018 with code P02 (car2go) |
PE82.85-P-2008-97BEA |