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

Model 238

Up To Model Year 2021

With Code 896 (Vehicle access and authorization via smartphone)

Model 238

Up To Model Year 2021

With Code 897 (Front wireless telephone charging)

Model 238

Up To Model Year 2021

With Code 899 (Front wireless telephone charging and antenna)

Shown On Model 238.3

Fig 1: Mobile Phone Cradle Control Unit Components Location - Model 238 Up To Model Year 2021 With Code 896, 897, 899 (Shown On Model 238.3)

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:

Power supply via circuit 30t and circuit 31
Reception of the switch-on signal by the head unit (A26/17)
Charging of mobile phones that support the Qi standard (with code 897 (Wireless mobile phone charging) or with code 899 (Multifunction telephony)):
- Inductive charging of the mobile phone with simultaneous cooling
- Reception of charge level from the mobile phone via the capacitive coupling
- Transmitting the charge level of the mobile phone via the telematics CAN (CAN A) to the head unit
Antenna connection (with code 899 (Multifunction telephony)):
- Data exchange of telephone and Internet signals with the mobile telephone network via the mobile radio antenna amplifier/compensator (A28/15), the telephone antenna splitter (A2/109), the left telephone antenna (A2/102) and the right telephone antenna (A2/103)
- Data exchange of telephone and Internet signals with the mobile phone via a capacitive coupling
Data exchange with the head unit via the telematics CAN and the integrated NFC interface (Near Field Communication) or Near Field Communication antenna (A2/156) with the NFC interface of the mobile phone for a simpler mobile phone connection (input, output)
Reception of a key code for drive authorization via the capacitive coupling from the mobile phone and forwarding of code via the telematics CAN (CAN A) to the head unit (with code 896 (Vehicle access and drive authorization via mobile phone)) (input, output)

Telephone (TEL) wiring diagram