Authorization of transmitter key/mobile phone, basic function

GF80.20-P-1004A

Authorization of transmitter key/mobile phone, basic function

08.09.2020

Model

all (CAR)

Overview

This document contains the following information:

 General

 Transmitter key authorization

 Digital vehicle key authorization (vehicles with vehicle access and drive authorization via mobile phone)

General

Vehicle access and start enable are only allowed with a valid access authorization code.

The drive authorization system checks the authorization of the transmitter key or the authorization of the Digital Vehicle Key (mobile phone or Digital Vehicle Key sticker) (vehicles with vehicle access and drive authorization via mobile phone). The Digital Vehicle Key can functionally replace the transmitter key.

If the authorization is valid, the drive authorization system approves access to the vehicle and grants the start enable where applicable.

After authorization, the following among other things takes place:

 Waking up CAN

 Waking up chassis FlexRay

 Locking/unlocking of vehicle (if requested)

Transmitter key authorization

The authorization of the transmitter key is started as soon as the drive authorization system receives a request to lock/unlock the vehicle or for start enable.

The transmitter key and the drive authorization system communicate with each other via antennas and exchange encrypted data. The transmitter key is authorized if the comparison of these data is defined as valid to the transmitter key.

Digital vehicle key authorization (vehicles with vehicle access and drive authorization via mobile phone)

The authorization of the Digital Vehicle Key is started as soon as it is held to the driver handle or placed in the stowage box/tray in the center console.

The Digital Vehicle Key and the drive authorization system communicate with each other via the near-field communication (NFC) antenna on the driver handle or in the stowage box/tray in the center console. Encrypted data is exchanged as a result. If the comparison of this data is defined as valid for the Digital Vehicle Key, the Digital Vehicle Key is authorized.

 NFC describes an international transmission standard for wireless data exchange per radio frequency over short distances (few centimeters).

The following prerequisites must be fulfilled for the use of the mobile phone as a Digital Vehicle Key:

 The mobile phone is equipped with the NFC function.

 The use of the mobile phone as a Digital Vehicle Key has been activated by the service center.

 The access and drive authorization data has been saved in the mobile phone.

 Apart from the NFC-enabled mobile phone, a Digital Vehicle Key Sticker can also be used. All functions of the Digital Vehicle Key are then, as previously described, possible with this Digital Vehicle Key Sticker.

	Function schematics
	Function schematic for authorization of vehicle access	Model 223	PE80.20-P-2502-97C
		Model 213, 238, 257, 290 as of model year 2021	PE80.20-P-2502-97E
		Model 118, 177, 247Model 167	PE80.20-P-2502-97A
		Model 293	PE80.20-P-2502-97B
	Additional basic functions
	Antenna system, basic function		GF82.62-P-9901A
	Control units
	Electronic ignition lock control unit, basic function		GF80.57-P-9890A
	KEYLESS-GO control unit, basic function		GF80.61-P-9891A
	Mobile phone cradle control unit, basic function	Model all (CAR) with code 897 (Front wireless telephone charging) Model all (CAR) with code 899 (Multifunction telephony)	GF82.70-P-9890A
	Components
	Transmitter key, basic function		GF80.35-P-2001A
	KEYLESS-GO door handle, basic function	Model all (CAR) with code 889 (KEYLESS-GO)	GF80.61-P-2003A