Drive authorization system, basic function

General

The drive authorization system (DAS) ensures that the vehicle can only be unlocked and started with a valid access authorization code. The DAS checks this access authorization code. If this is valid, all the control units involved in the DAS compare the access authorization code with each other. The DAS issues start enable after a successful comparison.

Function requirements

Where transmitter key is used:

 Transmitter key in the vehicle interior

 Transmitter key authorized

When using the Digital Vehicle Key (mobile phone or Digital Vehicle Key sticker) (vehicles with vehicle access and driver authorization via mobile phone):

 Digital Vehicle Key stored in the stowage compartment in the center console

 Digital Vehicle Key authorized

 The Digital Vehicle Key can functionally replace the transmitter key.

Operating principle

The access authorization code is queried by all involved control units. Check, release and feedback is performed separately by each control unit.

If the battery of the transmitter key is discharged or the wireless connection is malfunctioning, the vehicle can be started via the emergency start function. The transmitter key must be placed in the emergency start stowage compartment in the center console for this purpose. Via a transponder interface, the corresponding data are then exchanged for the identification of the transmitter key. After a brief moment, the drive authorization system then issues the start enable.