Mobile Phone Cradle Control Unit Component Description - GF82.70-P-0201FR

Model 257, 290 up to model year 2021 with code 896 (Vehicle access and authorization via smartphone) 

Model 257, 290 up to model year 2021 with code 897 (Front wireless telephone charging) 

Model 257, 290 up to model year 2021 with code 899 (Front wireless telephone charging and antenna) 

Shown on model 257.3 

Fig 1: Mobile Phone Cradle Control Unit Components Location - Model 290 Up To Model Year 2021 With Code 896/7/8 (Shown On Model 257.3)

Courtesy of MERCEDES-BENZ USA

Location 

The mobile phone cradle control unit is located under the upper control panel control unit (N72/1) in the instrument panel.

Tasks 

The mobile phone cradle control unit is responsible for the following:

• Reception of power supply over circuit 30t and circuit 31
• Reception of the switch-on signal (wake-up) from the head unit (A26/17)
• Near-field communication (NFC) with the mobile phone through the NFC interface of the mobile phone cradle control unit (for login (initialization) of the mobile phone on the head unit)
• Near-field communication with the mobile phone through antenna nearfield communication (A2/156) (for login (initialization) of the mobile phone on the head unit)
• With code 896 (Vehicle access and drive authorization over mobile phone): Communication for drive authorization over a capacitive coupling with the mobile phone and over the telematics CAN (CAN A) with the head unit
• With code 897 (Wireless mobile phone charging): Wireless charging of mobile phone (Qi standard)
• With code 899 (Multifunction telephony): The mobile phone cradle control unit connects the mobile phone through the cellular telephone system amplifier/compensator antenna (A28/15) and the telephone antenna splitter (A2/109) to the left telephone antenna (A2/102) and the right telephone antenna (A2/103), on model 290 with code 380 (Car telephony package) over the telephone antenna changeover switch (A2/168). The data exchange between mobile phone cradle control unit and the mobile phone takes place over a capacitive coupling. The mobile phone is charged without a cable (Qi standard)
• Communication through the telematics CAN (CAN A) with the head unit, e.g.:
  • Reception of charging requirements
  • Transmission of charging process status
  • Communication to log into the mobile phone on the head unit (initialization)
  • Communication for drive authorization with the electronic ignition lock control unit (N73) over the head unit as a gateway (with code 896 (Vehicle access and drive authorization through the mobile phone))
• Communication over the telematics CAN (CAN A) with the telephone control unit (N123/9) (with code 380 (Car telephony package)):
  • Sending of the status of the cellular telephone system antenna amplifier/compensator